http://git-wip-us.apache.org/repos/asf/flink/blob/cb282067/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphOperationsITCase.java
----------------------------------------------------------------------
diff --git 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphOperationsITCase.java
 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphOperationsITCase.java
index 4d7153d..e03e8cf 100644
--- 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphOperationsITCase.java
+++ 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphOperationsITCase.java
@@ -40,11 +40,11 @@ import java.util.List;
 @RunWith(Parameterized.class)
 public class GraphOperationsITCase extends MultipleProgramsTestBase {
 
-       public GraphOperationsITCase(TestExecutionMode mode){
+       public GraphOperationsITCase(TestExecutionMode mode) {
                super(mode);
        }
 
-    private String expectedResult;
+       private String expectedResult;
 
        @Test
        public void testUndirected() throws Exception {
@@ -54,19 +54,19 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
+               DataSet<Edge<Long, Long>> data = 
graph.getUndirected().getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = graph.getUndirected().getEdges();
-        List<Edge<Long, Long>> result= data.collect();
-        
                expectedResult = "1,2,12\n" + "2,1,12\n" +
-                                       "1,3,13\n" + "3,1,13\n" +
-                                       "2,3,23\n" + "3,2,23\n" +
-                                       "3,4,34\n" + "4,3,34\n" +
-                                       "3,5,35\n" + "5,3,35\n" +
-                                       "4,5,45\n" + "5,4,45\n" +
-                                       "5,1,51\n" + "1,5,51\n";
-               
+                       "1,3,13\n" + "3,1,13\n" +
+                       "2,3,23\n" + "3,2,23\n" +
+                       "3,4,34\n" + "4,3,34\n" +
+                       "3,5,35\n" + "5,3,35\n" +
+                       "4,5,45\n" + "5,4,45\n" +
+                       "5,1,51\n" + "1,5,51\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -78,19 +78,19 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
+               DataSet<Edge<Long, Long>> data = graph.reverse().getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = graph.reverse().getEdges();
-        List<Edge<Long, Long>> result= data.collect();
-        
                expectedResult = "2,1,12\n" +
-                                       "3,1,13\n" +
-                                       "3,2,23\n" +
-                                       "4,3,34\n" +
-                                       "5,3,35\n" +
-                                       "5,4,45\n" +
-                                       "1,5,51\n";
-               
+                       "3,1,13\n" +
+                       "3,2,23\n" +
+                       "4,3,34\n" +
+                       "5,3,35\n" +
+                       "5,4,45\n" +
+                       "1,5,51\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -103,24 +103,25 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
-               DataSet<Edge<Long, Long>> data= graph.subgraph(new 
FilterFunction<Vertex<Long, Long>>() {
-                                                  public boolean 
filter(Vertex<Long, Long> vertex) throws Exception {
-                                                          return 
(vertex.getValue() > 2);
-                                                  }
-                                          },
-                               new FilterFunction<Edge<Long, Long>>() {
-                                       public boolean filter(Edge<Long, Long> 
edge) throws Exception {
-                                               return (edge.getValue() > 34);
-                                       }
-                               }).getEdges();
-
-        List<Edge<Long, Long>> result= data.collect();
-        
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
+               DataSet<Edge<Long, Long>> data = graph.subgraph(
+                       new FilterFunction<Vertex<Long, Long>>() {
+                               public boolean filter(Vertex<Long, Long> 
vertex) throws Exception {
+                                       return (vertex.getValue() > 2);
+                               }
+                       },
+                       new FilterFunction<Edge<Long, Long>>() {
+                               public boolean filter(Edge<Long, Long> edge) 
throws Exception {
+                                       return (edge.getValue() > 34);
+                               }
+                       }).getEdges();
+
+               List<Edge<Long, Long>> result = data.collect();
+
                expectedResult = "3,5,35\n" +
-                                       "4,5,45\n";
-               
+                       "4,5,45\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -133,20 +134,20 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, Long>> data = graph.filterOnVertices(new 
FilterFunction<Vertex<Long, Long>>() {
                        public boolean filter(Vertex<Long, Long> vertex) throws 
Exception {
                                return (vertex.getValue() > 2);
                        }
                }).getEdges();
 
-        List<Edge<Long, Long>> result= data.collect();
-               
-               expectedResult =  "3,4,34\n" +
-                               "3,5,35\n" +
-                               "4,5,45\n";
-               
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -159,20 +160,20 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, Long>> data = graph.filterOnEdges(new 
FilterFunction<Edge<Long, Long>>() {
                        public boolean filter(Edge<Long, Long> edge) throws 
Exception {
                                return (edge.getValue() > 34);
                        }
                }).getEdges();
 
-        List<Edge<Long, Long>> result = data.collect();
-        
+               List<Edge<Long, Long>> result = data.collect();
+
                expectedResult = "3,5,35\n" +
-                                       "4,5,45\n" +
-                                       "5,1,51\n";
-               
+                       "4,5,45\n" +
+                       "5,1,51\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -184,13 +185,13 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
                DataSet<Long> data = env.fromElements(graph.numberOfVertices());
 
-        List<Long> result= data.collect();
-        
+               List<Long> result = data.collect();
+
                expectedResult = "5";
-               
+
                compareResultAsText(result, expectedResult);
        }
 
@@ -202,13 +203,13 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
                DataSet<Long> data = env.fromElements(graph.numberOfEdges());
 
-        List<Long> result= data.collect();
-        
+               List<Long> result = data.collect();
+
                expectedResult = "7";
-               
+
                compareResultAsText(result, expectedResult);
        }
 
@@ -220,13 +221,13 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Long> data = graph.getVertexIds();
-        List<Long> result= data.collect();
-        
+               List<Long> result = data.collect();
+
                expectedResult = "1\n2\n3\n4\n5\n";
-               
+
                compareResultAsText(result, expectedResult);
        }
 
@@ -238,16 +239,16 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Tuple2<Long, Long>> data = graph.getEdgeIds();
-        List<Tuple2<Long, Long>> result= data.collect();
-        
+               List<Tuple2<Long, Long>> result = data.collect();
+
                expectedResult = "1,2\n" + "1,3\n" +
-                               "2,3\n" + "3,4\n" +
-                               "3,5\n" + "4,5\n" +
-                               "5,1\n";
-               
+                       "2,3\n" + "3,4\n" +
+                       "3,5\n" + "4,5\n" +
+                       "5,1\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -259,7 +260,7 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
                List<Vertex<Long, Long>> vertices = new ArrayList<>();
                List<Edge<Long, Long>> edges = new ArrayList<>();
@@ -269,18 +270,18 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
 
                graph = graph.union(Graph.fromCollection(vertices, edges, env));
 
-        DataSet<Edge<Long, Long>> data = graph.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = graph.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
                expectedResult = "1,2,12\n" +
-                                       "1,3,13\n" +
-                                       "2,3,23\n" +
-                                       "3,4,34\n" +
-                                       "3,5,35\n" +
-                                       "4,5,45\n" +
-                                       "5,1,51\n" +
-                                       "6,1,61\n";
-               
+                       "1,3,13\n" +
+                       "2,3,23\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n" +
+                       "6,1,61\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -291,10 +292,10 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
                Graph<Long, Long, Long> graph2 = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexDataDifference(env),
-                               
TestGraphUtils.getLongLongEdgeDataDifference(env), env);
+                       TestGraphUtils.getLongLongEdgeDataDifference(env), env);
 
                graph = graph.difference(graph2);
 
@@ -305,24 +306,24 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
        }
 
        @Test
-       public void testDifferenceVertices() throws Exception{
+       public void testDifferenceVertices() throws Exception {
                /*Test  difference() method  by checking    the output  for 
getVertices()   on  the resultant   graph
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
                Graph<Long, Long, Long> graph2 = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexDataDifference(env),
-                               
TestGraphUtils.getLongLongEdgeDataDifference(env), env);
+                       TestGraphUtils.getLongLongEdgeDataDifference(env), env);
 
                graph = graph.difference(graph2);
 
                List<Vertex<Long, Long>> result = graph.getVertices().collect();
 
-               expectedResult =  "2,2\n" +
-                               "4,4\n" +
-                               "5,5\n" ;
+               expectedResult = "2,2\n" +
+                       "4,4\n" +
+                       "5,5\n";
 
                compareResultAsTuples(result, expectedResult);
        }
@@ -335,7 +336,7 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
                DataSet<Vertex<Long, Long>> vertex = env.fromElements(new 
Vertex<>(6L, 6L));
 
@@ -345,13 +346,13 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
 
                List<Edge<Long, Long>> result = graph.getEdges().collect();
 
-               expectedResult =        "1,2,12\n" +
-                               "1,3,13\n" +
-                               "2,3,23\n" +
-                               "3,4,34\n" +
-                               "3,5,35\n" +
-                               "4,5,45\n" +
-                               "5,1,51\n" ;
+               expectedResult = "1,2,12\n" +
+                       "1,3,13\n" +
+                       "2,3,23\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
                compareResultAsTuples(result, expectedResult);
        }
@@ -423,14 +424,14 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                env.execute();
 
                String expectedVertices = "1,(null)\n" +
-                               "3,(null)\n";
+                       "3,(null)\n";
 
                String expectedEdges = "1,3,13\n" +
-                               "1,3,13\n" +
-                               "1,3,13\n" +
-                               "1,3,13\n" +
-                               "1,3,14\n" +
-                               "1,3,14";
+                       "1,3,13\n" +
+                       "1,3,13\n" +
+                       "1,3,13\n" +
+                       "1,3,14\n" +
+                       "1,3,14";
 
                compareResultAsTuples(vertices, expectedVertices);
                compareResultAsTuples(edges, expectedEdges);
@@ -444,16 +445,16 @@ public class GraphOperationsITCase extends 
MultipleProgramsTestBase {
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        DataSet<Triplet<Long, Long, Long>> data = graph.getTriplets();
-        List<Triplet<Long, Long, Long>> result= data.collect();
+               DataSet<Triplet<Long, Long, Long>> data = graph.getTriplets();
+               List<Triplet<Long, Long, Long>> result = data.collect();
 
                expectedResult = "1,2,1,2,12\n" + "1,3,1,3,13\n" +
-                               "2,3,2,3,23\n" + "3,4,3,4,34\n" +
-                               "3,5,3,5,35\n" + "4,5,4,5,45\n" +
-                               "5,1,5,1,51\n";
-               
+                       "2,3,2,3,23\n" + "3,4,3,4,34\n" +
+                       "3,5,3,5,35\n" + "4,5,4,5,45\n" +
+                       "5,1,5,1,51\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/flink/blob/cb282067/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithEdgesITCase.java
----------------------------------------------------------------------
diff --git 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithEdgesITCase.java
 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithEdgesITCase.java
index cb83b33..6988218 100644
--- 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithEdgesITCase.java
+++ 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithEdgesITCase.java
@@ -39,11 +39,11 @@ import java.util.List;
 @RunWith(Parameterized.class)
 public class JoinWithEdgesITCase extends MultipleProgramsTestBase {
 
-       public JoinWithEdgesITCase(TestExecutionMode mode){
+       public JoinWithEdgesITCase(TestExecutionMode mode) {
                super(mode);
        }
 
-    private String expectedResult;
+       private String expectedResult;
 
        @Test
        public void testWithEdgesInputDataset() throws Exception {
@@ -51,416 +51,416 @@ public class JoinWithEdgesITCase extends 
MultipleProgramsTestBase {
                 * Test joinWithEdges with the input DataSet parameter identical
                 * to the edge DataSet
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = graph.joinWithEdges(graph.getEdges()
-                        .map(new EdgeToTuple3Map<Long, Long>()), new 
AddValuesMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdges(graph.getEdges()
+                       .map(new EdgeToTuple3Map<Long, Long>()), new 
AddValuesMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,46\n" +
+                       "3,4,68\n" +
+                       "3,5,70\n" +
+                       "4,5,90\n" +
+                       "5,1,102\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,46\n" +
-                       "3,4,68\n" +
-                       "3,5,70\n" +
-                       "4,5,90\n" +
-                       "5,1,102\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithLessElements() throws Exception {
-           /*
+               /*
                 * Test joinWithEdges with the input DataSet passed as a 
parameter containing
                 * less elements than the edge DataSet, but of the same type
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdges(graph.getEdges().first(3)
+                       .map(new EdgeToTuple3Map<Long, Long>()), new 
AddValuesMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdges(graph.getEdges().first(3)
-                        .map(new EdgeToTuple3Map<Long, Long>()), new 
AddValuesMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,46\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,46\n" +
-                       "3,4,34\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithLessElementsDifferentType() throws Exception {
-           /*
+               /*
                 * Test joinWithEdges with the input DataSet passed as a 
parameter containing
                 * less elements than the edge DataSet and of a different 
type(Boolean)
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdges(graph.getEdges().first(3)
-                        .map(new BooleanEdgeValueMapper()), new 
DoubleIfTrueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdges(graph.getEdges().first(3)
+                       .map(new BooleanEdgeValueMapper()), new 
DoubleIfTrueMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,46\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,46\n" +
-                       "3,4,34\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithNoCommonKeys() throws Exception {
-           /*
+               /*
                 * Test joinWithEdges with the input DataSet containing 
different keys than the edge DataSet
                 * - the iterator becomes empty.
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdges(TestGraphUtils.getLongLongLongTuple3Data(env),
+                       new DoubleValueMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdges(TestGraphUtils.getLongLongLongTuple3Data(env),
-                new DoubleValueMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,46\n" +
+                       "3,4,68\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,46\n" +
-                       "3,4,68\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithCustomType() throws Exception {
-           /*
+               /*
             * Test joinWithEdges with a DataSet containing custom parametrised 
type input values
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdges(TestGraphUtils.getLongLongCustomTuple3Data(env),
-                new CustomValueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdges(TestGraphUtils.getLongLongCustomTuple3Data(env),
+                       new CustomValueMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,10\n" +
+                       "1,3,20\n" +
+                       "2,3,30\n" +
+                       "3,4,40\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,10\n" +
-                       "1,3,20\n" +
-                       "2,3,30\n" +
-                       "3,4,40\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithEdgesOnSource() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnSource with the input DataSet parameter 
identical
                 * to the edge DataSet
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(graph.getEdges()
+                       .map(new ProjectSourceAndValueMapper()), new 
AddValuesMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(graph.getEdges()
-                        .map(new ProjectSourceAndValueMapper()), new 
AddValuesMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,24\n" +
+                       "1,3,25\n" +
+                       "2,3,46\n" +
+                       "3,4,68\n" +
+                       "3,5,69\n" +
+                       "4,5,90\n" +
+                       "5,1,102\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,25\n" +
-                       "2,3,46\n" +
-                       "3,4,68\n" +
-                       "3,5,69\n" +
-                       "4,5,90\n" +
-                       "5,1,102\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnSourceWithLessElements() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnSource with the input DataSet passed as 
a parameter containing
                 * less elements than the edge DataSet, but of the same type
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(graph.getEdges().first(3)
-                        .map(new ProjectSourceAndValueMapper()), new 
AddValuesMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(graph.getEdges().first(3)
+                       .map(new ProjectSourceAndValueMapper()), new 
AddValuesMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,24\n" +
+                       "1,3,25\n" +
+                       "2,3,46\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,25\n" +
-                       "2,3,46\n" +
-                       "3,4,34\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnSourceWithDifferentType() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnSource with the input DataSet passed as 
a parameter containing
                 * less elements than the edge DataSet and of a different 
type(Boolean)
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(graph.getEdges().first(3)
+                       .map(new ProjectSourceWithTrueMapper()), new 
DoubleIfTrueMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(graph.getEdges().first(3)
-                        .map(new ProjectSourceWithTrueMapper()), new 
DoubleIfTrueMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,46\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,46\n" +
-                       "3,4,34\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnSourceWithNoCommonKeys() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnSource with the input DataSet containing 
different keys than the edge DataSet
                 * - the iterator becomes empty.
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(TestGraphUtils.getLongLongTuple2SourceData(env),
-                new DoubleValueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(TestGraphUtils.getLongLongTuple2SourceData(env),
+                       new DoubleValueMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,20\n" +
+                       "1,3,20\n" +
+                       "2,3,60\n" +
+                       "3,4,80\n" +
+                       "3,5,80\n" +
+                       "4,5,120\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,20\n" +
-                       "1,3,20\n" +
-                       "2,3,60\n" +
-                       "3,4,80\n" +
-                       "3,5,80\n" +
-                       "4,5,120\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnSourceWithCustom() throws Exception {
-           /*
+               /*
             * Test joinWithEdgesOnSource with a DataSet containing custom 
parametrised type input values
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(TestGraphUtils.getLongCustomTuple2SourceData(env),
+                       new CustomValueMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnSource(TestGraphUtils.getLongCustomTuple2SourceData(env),
-                new CustomValueMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,10\n" +
+                       "1,3,10\n" +
+                       "2,3,30\n" +
+                       "3,4,40\n" +
+                       "3,5,40\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,10\n" +
-                       "1,3,10\n" +
-                       "2,3,30\n" +
-                       "3,4,40\n" +
-                       "3,5,40\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithEdgesOnTarget() throws Exception {
-    /*
-        * Test joinWithEdgesOnTarget with the input DataSet parameter identical
-        * to the edge DataSet
-        */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
-
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(graph.getEdges()
-                        .map(new ProjectTargetAndValueMapper()), new 
AddValuesMapper());
-
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
-
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,36\n" +
-                       "3,4,68\n" +
-                       "3,5,70\n" +
-                       "4,5,80\n" +
-                       "5,1,102\n";
-        
+               /*
+                * Test joinWithEdgesOnTarget with the input DataSet parameter 
identical
+                * to the edge DataSet
+                */
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(graph.getEdges()
+                       .map(new ProjectTargetAndValueMapper()), new 
AddValuesMapper());
+
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,36\n" +
+                       "3,4,68\n" +
+                       "3,5,70\n" +
+                       "4,5,80\n" +
+                       "5,1,102\n";
+
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithOnTargetWithLessElements() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnTarget with the input DataSet passed as 
a parameter containing
                 * less elements than the edge DataSet, but of the same type
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(graph.getEdges().first(3)
+                       .map(new ProjectTargetAndValueMapper()), new 
AddValuesMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(graph.getEdges().first(3)
-                        .map(new ProjectTargetAndValueMapper()), new 
AddValuesMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,36\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,36\n" +
-                       "3,4,34\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnTargetWithDifferentType() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnTarget with the input DataSet passed as 
a parameter containing
                 * less elements than the edge DataSet and of a different 
type(Boolean)
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(graph.getEdges().first(3)
-                        .map(new ProjectTargetWithTrueMapper()), new 
DoubleIfTrueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(graph.getEdges().first(3)
+                       .map(new ProjectTargetWithTrueMapper()), new 
DoubleIfTrueMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,24\n" +
+                       "1,3,26\n" +
+                       "2,3,46\n" +
+                       "3,4,34\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,24\n" +
-                       "1,3,26\n" +
-                       "2,3,46\n" +
-                       "3,4,34\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnTargetWithNoCommonKeys() throws Exception {
-           /*
+               /*
                 * Test joinWithEdgesOnTarget with the input DataSet containing 
different keys than the edge DataSet
                 * - the iterator becomes empty.
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(TestGraphUtils.getLongLongTuple2TargetData(env),
+                       new DoubleValueMapper());
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(TestGraphUtils.getLongLongTuple2TargetData(env),
-                new DoubleValueMapper());
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               expectedResult = "1,2,20\n" +
+                       "1,3,40\n" +
+                       "2,3,40\n" +
+                       "3,4,80\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,140\n";
 
-        expectedResult = "1,2,20\n" +
-                       "1,3,40\n" +
-                       "2,3,40\n" +
-                       "3,4,80\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,140\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testOnTargetWithCustom() throws Exception {
-           /*
+               /*
             * Test joinWithEdgesOnTarget with a DataSet containing custom 
parametrised type input values
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(TestGraphUtils.getLongCustomTuple2TargetData(env),
-                new CustomValueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithEdgesOnTarget(TestGraphUtils.getLongCustomTuple2TargetData(env),
+                       new CustomValueMapper());
 
-        DataSet<Edge<Long, Long>> data = res.getEdges();
-        List<Edge<Long, Long>> result= data.collect();
+               DataSet<Edge<Long, Long>> data = res.getEdges();
+               List<Edge<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2,10\n" +
+                       "1,3,20\n" +
+                       "2,3,20\n" +
+                       "3,4,40\n" +
+                       "3,5,35\n" +
+                       "4,5,45\n" +
+                       "5,1,51\n";
 
-        expectedResult = "1,2,10\n" +
-                       "1,3,20\n" +
-                       "2,3,20\n" +
-                       "3,4,40\n" +
-                       "3,5,35\n" +
-                       "4,5,45\n" +
-                       "5,1,51\n";
-        
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @SuppressWarnings("serial")
        private static final class AddValuesMapper implements 
EdgeJoinFunction<Long, Long> {
@@ -472,67 +472,64 @@ public class JoinWithEdgesITCase extends 
MultipleProgramsTestBase {
 
        @SuppressWarnings("serial")
        private static final class BooleanEdgeValueMapper implements 
MapFunction<Edge<Long, Long>, Tuple3<Long, Long, Boolean>> {
-        public Tuple3<Long, Long, Boolean> map(Edge<Long, Long> edge) throws 
Exception {
-            return new Tuple3<>(edge.getSource(), edge.getTarget(), true);
-        }
-    }
+               public Tuple3<Long, Long, Boolean> map(Edge<Long, Long> edge) 
throws Exception {
+                       return new Tuple3<>(edge.getSource(), edge.getTarget(), 
true);
+               }
+       }
 
        @SuppressWarnings("serial")
        private static final class DoubleIfTrueMapper implements 
EdgeJoinFunction<Long, Boolean> {
 
                public Long edgeJoin(Long edgeValue, Boolean inputValue) {
-            if(inputValue) {
-                return edgeValue * 2;
-            }
-            else {
-                return edgeValue;
-            }
+                       if (inputValue) {
+                               return edgeValue * 2;
+                       } else {
+                               return edgeValue;
+                       }
                }
-    }
+       }
 
        @SuppressWarnings("serial")
        private static final class DoubleValueMapper implements 
EdgeJoinFunction<Long, Long> {
- 
+
                public Long edgeJoin(Long edgeValue, Long inputValue) {
-                       return inputValue*2;
+                       return inputValue * 2;
                }
-    }
+       }
 
        @SuppressWarnings("serial")
-       private static final class CustomValueMapper implements 
EdgeJoinFunction<
-       Long, DummyCustomParameterizedType<Float>> {
+       private static final class CustomValueMapper implements 
EdgeJoinFunction<Long, DummyCustomParameterizedType<Float>> {
 
-               public Long edgeJoin(Long edgeValue,
-                               DummyCustomParameterizedType<Float> inputValue) 
{
+               public Long edgeJoin(Long edgeValue, 
DummyCustomParameterizedType<Float> inputValue) {
                        return (long) inputValue.getIntField();
                }
-    }
+       }
 
        @SuppressWarnings("serial")
        private static final class ProjectSourceAndValueMapper implements 
MapFunction<Edge<Long, Long>, Tuple2<Long, Long>> {
-        public Tuple2<Long, Long> map(Edge<Long, Long> edge) throws Exception {
-            return new Tuple2<>(edge.getSource(), edge.getValue());
-        }
-    }
+               public Tuple2<Long, Long> map(Edge<Long, Long> edge) throws 
Exception {
+                       return new Tuple2<>(edge.getSource(), edge.getValue());
+               }
+       }
 
        @SuppressWarnings("serial")
        private static final class ProjectSourceWithTrueMapper implements 
MapFunction<Edge<Long, Long>, Tuple2<Long, Boolean>> {
-        public Tuple2<Long, Boolean> map(Edge<Long, Long> edge) throws 
Exception {
-            return new Tuple2<>(edge.getSource(), true);
-        }
-    }
+               public Tuple2<Long, Boolean> map(Edge<Long, Long> edge) throws 
Exception {
+                       return new Tuple2<>(edge.getSource(), true);
+               }
+       }
 
        @SuppressWarnings("serial")
        private static final class ProjectTargetAndValueMapper implements 
MapFunction<Edge<Long, Long>, Tuple2<Long, Long>> {
-        public Tuple2<Long, Long> map(Edge<Long, Long> edge) throws Exception {
-            return new Tuple2<>(edge.getTarget(), edge.getValue());
-        }
-    }
+               public Tuple2<Long, Long> map(Edge<Long, Long> edge) throws 
Exception {
+                       return new Tuple2<>(edge.getTarget(), edge.getValue());
+               }
+       }
 
        @SuppressWarnings("serial")
        private static final class ProjectTargetWithTrueMapper implements 
MapFunction<Edge<Long, Long>, Tuple2<Long, Boolean>> {
-        public Tuple2<Long, Boolean> map(Edge<Long, Long> edge) throws 
Exception {
-            return new Tuple2<>(edge.getTarget(), true);
-        }
-    }
+               public Tuple2<Long, Boolean> map(Edge<Long, Long> edge) throws 
Exception {
+                       return new Tuple2<>(edge.getTarget(), true);
+               }
+       }
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/flink/blob/cb282067/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithVerticesITCase.java
----------------------------------------------------------------------
diff --git 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithVerticesITCase.java
 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithVerticesITCase.java
index 29badba..7676e8c 100644
--- 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithVerticesITCase.java
+++ 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/JoinWithVerticesITCase.java
@@ -38,11 +38,11 @@ import java.util.List;
 @RunWith(Parameterized.class)
 public class JoinWithVerticesITCase extends MultipleProgramsTestBase {
 
-       public JoinWithVerticesITCase(TestExecutionMode mode){
+       public JoinWithVerticesITCase(TestExecutionMode mode) {
                super(mode);
        }
 
-    private String expectedResult;
+       private String expectedResult;
 
        @Test
        public void testJoinWithVertexSet() throws Exception {
@@ -50,77 +50,77 @@ public class JoinWithVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test joinWithVertices with the input DataSet parameter 
identical
                 * to the vertex DataSet
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithVertices(graph.getVertices()
-                        .map(new VertexToTuple2Map<Long, Long>()), new 
AddValuesMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithVertices(graph.getVertices()
+                       .map(new VertexToTuple2Map<Long, Long>()), new 
AddValuesMapper());
 
                DataSet<Vertex<Long, Long>> data = res.getVertices();
-        List<Vertex<Long, Long>> result= data.collect();
-
-       expectedResult = "1,2\n" +
-                       "2,4\n" +
-                       "3,6\n" +
-                       "4,8\n" +
-                       "5,10\n";
-       
+               List<Vertex<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2\n" +
+                       "2,4\n" +
+                       "3,6\n" +
+                       "4,8\n" +
+                       "5,10\n";
+
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithLessElements() throws Exception {
-       /*
-        * Test joinWithVertices with the input DataSet passed as a parameter 
containing
-        * less elements than the vertex DataSet, but of the same type
-        */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               /*
+                * Test joinWithVertices with the input DataSet passed as a 
parameter containing
+                * less elements than the vertex DataSet, but of the same type
+                */
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithVertices(graph.getVertices().first(3)
-                        .map(new VertexToTuple2Map<Long, Long>()), new 
AddValuesMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithVertices(graph.getVertices().first(3)
+                       .map(new VertexToTuple2Map<Long, Long>()), new 
AddValuesMapper());
 
                DataSet<Vertex<Long, Long>> data = res.getVertices();
-        List<Vertex<Long, Long>> result= data.collect();
-
-        expectedResult = "1,2\n" +
-                       "2,4\n" +
-                       "3,6\n" +
-                       "4,4\n" +
-                       "5,5\n";
-        
+               List<Vertex<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2\n" +
+                       "2,4\n" +
+                       "3,6\n" +
+                       "4,4\n" +
+                       "5,5\n";
+
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithDifferentType() throws Exception {
-       /*
-        * Test joinWithVertices with the input DataSet passed as a parameter 
containing
-        * less elements than the vertex DataSet and of a different 
type(Boolean)
-        */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               /*
+                * Test joinWithVertices with the input DataSet passed as a 
parameter containing
+                * less elements than the vertex DataSet and of a different 
type(Boolean)
+                */
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithVertices(graph.getVertices().first(3)
-                        .map(new ProjectIdWithTrue()), new 
DoubleIfTrueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithVertices(graph.getVertices().first(3)
+                       .map(new ProjectIdWithTrue()), new 
DoubleIfTrueMapper());
 
                DataSet<Vertex<Long, Long>> data = res.getVertices();
-        List<Vertex<Long, Long>> result= data.collect();
-
-        expectedResult = "1,2\n" +
-                       "2,4\n" +
-                       "3,6\n" +
-                       "4,4\n" +
-                       "5,5\n";
-        
+               List<Vertex<Long, Long>> result = data.collect();
+
+               expectedResult = "1,2\n" +
+                       "2,4\n" +
+                       "3,6\n" +
+                       "4,4\n" +
+                       "5,5\n";
+
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithDifferentKeys() throws Exception {
@@ -128,50 +128,50 @@ public class JoinWithVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test joinWithVertices with an input DataSet containing 
different keys than the vertex DataSet
                 * - the iterator becomes empty.
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithVertices(TestGraphUtils.getLongLongTuple2Data(env),
-                new ProjectSecondMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithVertices(TestGraphUtils.getLongLongTuple2Data(env),
+                       new ProjectSecondMapper());
 
                DataSet<Vertex<Long, Long>> data = res.getVertices();
-        List<Vertex<Long, Long>> result= data.collect();
-
-        expectedResult = "1,10\n" +
-                       "2,20\n" +
-                       "3,30\n" +
-                       "4,40\n" +
-                       "5,5\n";
-        
+               List<Vertex<Long, Long>> result = data.collect();
+
+               expectedResult = "1,10\n" +
+                       "2,20\n" +
+                       "3,30\n" +
+                       "4,40\n" +
+                       "5,5\n";
+
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @Test
        public void testWithCustomType() throws Exception {
                /*
                 * Test joinWithVertices with a DataSet containing custom 
parametrised type input values
                 */
-        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
+               final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
 
-        Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                TestGraphUtils.getLongLongEdgeData(env), env);
+               Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+                       TestGraphUtils.getLongLongEdgeData(env), env);
 
-        Graph<Long, Long, Long> res = 
graph.joinWithVertices(TestGraphUtils.getLongCustomTuple2Data(env),
-                new CustomValueMapper());
+               Graph<Long, Long, Long> res = 
graph.joinWithVertices(TestGraphUtils.getLongCustomTuple2Data(env),
+                       new CustomValueMapper());
 
                DataSet<Vertex<Long, Long>> data = res.getVertices();
-        List<Vertex<Long, Long>> result= data.collect();
-
-        expectedResult = "1,10\n" +
-                       "2,20\n" +
-                       "3,30\n" +
-                       "4,40\n" +
-                       "5,5\n";
-        
+               List<Vertex<Long, Long>> result = data.collect();
+
+               expectedResult = "1,10\n" +
+                       "2,20\n" +
+                       "3,30\n" +
+                       "4,40\n" +
+                       "5,5\n";
+
                compareResultAsTuples(result, expectedResult);
-    }
+       }
 
        @SuppressWarnings("serial")
        private static final class AddValuesMapper implements 
VertexJoinFunction<Long, Long> {
@@ -183,23 +183,22 @@ public class JoinWithVerticesITCase extends 
MultipleProgramsTestBase {
 
        @SuppressWarnings("serial")
        private static final class ProjectIdWithTrue implements 
MapFunction<Vertex<Long, Long>, Tuple2<Long, Boolean>> {
-        public Tuple2<Long, Boolean> map(Vertex<Long, Long> vertex) throws 
Exception {
-            return new Tuple2<>(vertex.getId(), true);
-        }
-    }
+               public Tuple2<Long, Boolean> map(Vertex<Long, Long> vertex) 
throws Exception {
+                       return new Tuple2<>(vertex.getId(), true);
+               }
+       }
 
        @SuppressWarnings("serial")
        private static final class DoubleIfTrueMapper implements 
VertexJoinFunction<Long, Boolean> {
 
                public Long vertexJoin(Long vertexValue, Boolean inputValue) {
-            if(inputValue) {
-                return vertexValue * 2;
-            }
-            else {
-                return vertexValue;
-            }
+                       if (inputValue) {
+                               return vertexValue * 2;
+                       } else {
+                               return vertexValue;
+                       }
                }
-    }
+       }
 
        @SuppressWarnings("serial")
        private static final class ProjectSecondMapper implements 
VertexJoinFunction<Long, Long> {
@@ -207,7 +206,7 @@ public class JoinWithVerticesITCase extends 
MultipleProgramsTestBase {
                public Long vertexJoin(Long vertexValue, Long inputValue) {
                        return inputValue;
                }
-    }
+       }
 
        @SuppressWarnings("serial")
        private static final class CustomValueMapper implements 
VertexJoinFunction<Long,
@@ -216,5 +215,5 @@ public class JoinWithVerticesITCase extends 
MultipleProgramsTestBase {
                public Long vertexJoin(Long vertexValue, 
DummyCustomParameterizedType<Float> inputValue) {
                        return (long) inputValue.getIntField();
                }
-    }
+       }
 }

http://git-wip-us.apache.org/repos/asf/flink/blob/cb282067/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapEdgesITCase.java
----------------------------------------------------------------------
diff --git 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapEdgesITCase.java
 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapEdgesITCase.java
index 5e751a5..34a2518 100644
--- 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapEdgesITCase.java
+++ 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapEdgesITCase.java
@@ -18,8 +18,6 @@
 
 package org.apache.flink.graph.test.operations;
 
-import java.util.List;
-
 import org.apache.flink.api.common.functions.MapFunction;
 import org.apache.flink.api.java.DataSet;
 import org.apache.flink.api.java.ExecutionEnvironment;
@@ -34,14 +32,16 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 
+import java.util.List;
+
 @RunWith(Parameterized.class)
 public class MapEdgesITCase extends MultipleProgramsTestBase {
 
-       public MapEdgesITCase(TestExecutionMode mode){
+       public MapEdgesITCase(TestExecutionMode mode) {
                super(mode);
        }
 
-    private String expectedResult;
+       private String expectedResult;
 
        @Test
        public void testWithSameValue() throws Exception {
@@ -49,21 +49,21 @@ public class MapEdgesITCase extends 
MultipleProgramsTestBase {
                 * Test mapEdges() keeping the same value type
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, Long>> mappedEdges = graph.mapEdges(new 
AddOneMapper()).getEdges();
-        List<Edge<Long, Long>> result= mappedEdges.collect();
-        
+               List<Edge<Long, Long>> result = mappedEdges.collect();
+
                expectedResult = "1,2,13\n" +
-                               "1,3,14\n" +
-                               "2,3,24\n" +
-                               "3,4,35\n" +
-                               "3,5,36\n" + 
-                               "4,5,46\n" + 
-                               "5,1,52\n";
-               
+                       "1,3,14\n" +
+                       "2,3,24\n" +
+                       "3,4,35\n" +
+                       "3,5,36\n" +
+                       "4,5,46\n" +
+                       "5,1,52\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -73,21 +73,21 @@ public class MapEdgesITCase extends 
MultipleProgramsTestBase {
                 * Test mapEdges() and change the value type to String
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, String>> mappedEdges = graph.mapEdges(new 
ToStringMapper()).getEdges();
-               List<Edge<Long, String>> result= mappedEdges.collect();
-               
+               List<Edge<Long, String>> result = mappedEdges.collect();
+
                expectedResult = "1,2,string(12)\n" +
-                               "1,3,string(13)\n" +
-                               "2,3,string(23)\n" +
-                               "3,4,string(34)\n" +
-                               "3,5,string(35)\n" + 
-                               "4,5,string(45)\n" + 
-                               "5,1,string(51)\n";
-               
+                       "1,3,string(13)\n" +
+                       "2,3,string(23)\n" +
+                       "3,4,string(34)\n" +
+                       "3,5,string(35)\n" +
+                       "4,5,string(45)\n" +
+                       "5,1,string(51)\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -97,21 +97,21 @@ public class MapEdgesITCase extends 
MultipleProgramsTestBase {
                 * Test mapEdges() and change the value type to a Tuple1
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, Tuple1<Long>>> mappedEdges = 
graph.mapEdges(new ToTuple1Mapper()).getEdges();
-               List<Edge<Long, Tuple1<Long>>> result= mappedEdges.collect();
+               List<Edge<Long, Tuple1<Long>>> result = mappedEdges.collect();
 
                expectedResult = "1,2,(12)\n" +
-                               "1,3,(13)\n" +
-                               "2,3,(23)\n" +
-                               "3,4,(34)\n" +
-                               "3,5,(35)\n" + 
-                               "4,5,(45)\n" + 
-                               "5,1,(51)\n";
-               
+                       "1,3,(13)\n" +
+                       "2,3,(23)\n" +
+                       "3,4,(34)\n" +
+                       "3,5,(35)\n" +
+                       "4,5,(45)\n" +
+                       "5,1,(51)\n";
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -121,21 +121,21 @@ public class MapEdgesITCase extends 
MultipleProgramsTestBase {
                 * Test mapEdges() and change the value type to a custom type
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, DummyCustomType>> mappedEdges = 
graph.mapEdges(new ToCustomTypeMapper()).getEdges();
-               List<Edge<Long, DummyCustomType>> result= mappedEdges.collect();
+               List<Edge<Long, DummyCustomType>> result = 
mappedEdges.collect();
 
                expectedResult = "1,2,(T,12)\n" +
                        "1,3,(T,13)\n" +
                        "2,3,(T,23)\n" +
                        "3,4,(T,34)\n" +
-                       "3,5,(T,35)\n" + 
-                       "4,5,(T,45)\n" + 
+                       "3,5,(T,35)\n" +
+                       "4,5,(T,45)\n" +
                        "5,1,(T,51)\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -145,29 +145,29 @@ public class MapEdgesITCase extends 
MultipleProgramsTestBase {
                 * Test mapEdges() and change the value type to a parameterized 
custom type
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Edge<Long, DummyCustomParameterizedType<Double>>> 
mappedEdges = graph.mapEdges(
-                               new 
ToCustomParametrizedTypeMapper()).getEdges();
-               List<Edge<Long, DummyCustomParameterizedType<Double>>> result= 
mappedEdges.collect();
-       
+                       new ToCustomParametrizedTypeMapper()).getEdges();
+               List<Edge<Long, DummyCustomParameterizedType<Double>>> result = 
mappedEdges.collect();
+
                expectedResult = "1,2,(12.0,12)\n" +
                        "1,3,(13.0,13)\n" +
                        "2,3,(23.0,23)\n" +
                        "3,4,(34.0,34)\n" +
-                       "3,5,(35.0,35)\n" + 
-                       "4,5,(45.0,45)\n" + 
+                       "3,5,(35.0,35)\n" +
+                       "4,5,(45.0,45)\n" +
                        "5,1,(51.0,51)\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
        @SuppressWarnings("serial")
        private static final class AddOneMapper implements 
MapFunction<Edge<Long, Long>, Long> {
                public Long map(Edge<Long, Long> edge) throws Exception {
-                       return edge.getValue()+1;
+                       return edge.getValue() + 1;
                }
        }
 
@@ -191,19 +191,19 @@ public class MapEdgesITCase extends 
MultipleProgramsTestBase {
        private static final class ToCustomTypeMapper implements 
MapFunction<Edge<Long, Long>, DummyCustomType> {
                public DummyCustomType map(Edge<Long, Long> edge) throws 
Exception {
                        DummyCustomType dummyValue = new DummyCustomType();
-                       dummyValue.setIntField(edge.getValue().intValue());     
                                        
+                       dummyValue.setIntField(edge.getValue().intValue());
                        return dummyValue;
                }
        }
 
        @SuppressWarnings("serial")
-       private static final class ToCustomParametrizedTypeMapper implements 
MapFunction<Edge<Long, Long>, 
+       private static final class ToCustomParametrizedTypeMapper implements 
MapFunction<Edge<Long, Long>,
                DummyCustomParameterizedType<Double>> {
 
                public DummyCustomParameterizedType<Double> map(Edge<Long, 
Long> edge) throws Exception {
                        DummyCustomParameterizedType<Double> dummyValue = new 
DummyCustomParameterizedType<>();
                        dummyValue.setIntField(edge.getValue().intValue());
-                       dummyValue.setTField(new Double(edge.getValue()));      
                                        
+                       dummyValue.setTField(new Double(edge.getValue()));
                        return dummyValue;
                }
        }

http://git-wip-us.apache.org/repos/asf/flink/blob/cb282067/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapVerticesITCase.java
----------------------------------------------------------------------
diff --git 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapVerticesITCase.java
 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapVerticesITCase.java
index 108be3e..24aae7b 100644
--- 
a/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapVerticesITCase.java
+++ 
b/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/MapVerticesITCase.java
@@ -18,8 +18,6 @@
 
 package org.apache.flink.graph.test.operations;
 
-import java.util.List;
-
 import org.apache.flink.api.common.functions.MapFunction;
 import org.apache.flink.api.java.DataSet;
 import org.apache.flink.api.java.ExecutionEnvironment;
@@ -34,14 +32,16 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 
+import java.util.List;
+
 @RunWith(Parameterized.class)
 public class MapVerticesITCase extends MultipleProgramsTestBase {
 
-       public MapVerticesITCase(TestExecutionMode mode){
+       public MapVerticesITCase(TestExecutionMode mode) {
                super(mode);
        }
 
-    private String expectedResult;
+       private String expectedResult;
 
        @Test
        public void testWithSameValue() throws Exception {
@@ -49,19 +49,19 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test mapVertices() keeping the same value type
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
-               DataSet<Vertex<Long, Long>> mappedVertices = 
graph.mapVertices(new AddOneMapper()).getVertices();       
-        List<Vertex<Long, Long>> result= mappedVertices.collect();
-        
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
+               DataSet<Vertex<Long, Long>> mappedVertices = 
graph.mapVertices(new AddOneMapper()).getVertices();
+               List<Vertex<Long, Long>> result = mappedVertices.collect();
+
                expectedResult = "1,2\n" +
                        "2,3\n" +
                        "3,4\n" +
                        "4,5\n" +
                        "5,6\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -71,19 +71,19 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test mapVertices() and change the value type to String
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Vertex<Long, String>> mappedVertices = 
graph.mapVertices(new ToStringMapper()).getVertices();
-        List<Vertex<Long, String>> result= mappedVertices.collect();
+               List<Vertex<Long, String>> result = mappedVertices.collect();
 
                expectedResult = "1,one\n" +
                        "2,two\n" +
                        "3,three\n" +
                        "4,four\n" +
                        "5,five\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -93,19 +93,19 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test mapVertices() and change the value type to a Tuple1
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Vertex<Long, Tuple1<Long>>> mappedVertices = 
graph.mapVertices(new ToTuple1Mapper()).getVertices();
-        List<Vertex<Long, Tuple1<Long>>> result= mappedVertices.collect();
+               List<Vertex<Long, Tuple1<Long>>> result = 
mappedVertices.collect();
 
                expectedResult = "1,(1)\n" +
                        "2,(2)\n" +
                        "3,(3)\n" +
                        "4,(4)\n" +
                        "5,(5)\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -115,19 +115,19 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test mapVertices() and change the value type to a custom type
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Vertex<Long, DummyCustomType>> mappedVertices = 
graph.mapVertices(new ToCustomTypeMapper()).getVertices();
-        List<Vertex<Long, DummyCustomType>> result= mappedVertices.collect();
+               List<Vertex<Long, DummyCustomType>> result = 
mappedVertices.collect();
 
                expectedResult = "1,(T,1)\n" +
                        "2,(T,2)\n" +
                        "3,(T,3)\n" +
                        "4,(T,4)\n" +
                        "5,(T,5)\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
@@ -137,27 +137,27 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
                 * Test mapVertices() and change the value type to a 
parameterized custom type
                 */
                final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
-               
+
                Graph<Long, Long, Long> graph = 
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
-                               TestGraphUtils.getLongLongEdgeData(env), env);
-               
+                       TestGraphUtils.getLongLongEdgeData(env), env);
+
                DataSet<Vertex<Long, DummyCustomParameterizedType<Double>>> 
mappedVertices = graph.mapVertices(
-                               new 
ToCustomParametrizedTypeMapper()).getVertices();
-        List<Vertex<Long, DummyCustomParameterizedType<Double>>> result= 
mappedVertices.collect();
-       
+                       new ToCustomParametrizedTypeMapper()).getVertices();
+               List<Vertex<Long, DummyCustomParameterizedType<Double>>> result 
= mappedVertices.collect();
+
                expectedResult = "1,(1.0,1)\n" +
                        "2,(2.0,2)\n" +
                        "3,(3.0,3)\n" +
                        "4,(4.0,4)\n" +
                        "5,(5.0,5)\n";
-               
+
                compareResultAsTuples(result, expectedResult);
        }
 
        @SuppressWarnings("serial")
        private static final class AddOneMapper implements 
MapFunction<Vertex<Long, Long>, Long> {
                public Long map(Vertex<Long, Long> value) throws Exception {
-                       return value.getValue()+1;
+                       return value.getValue() + 1;
                }
        }
 
@@ -167,20 +167,15 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
                        String stringValue;
                        if (vertex.getValue() == 1) {
                                stringValue = "one";
-                       }
-                       else if (vertex.getValue() == 2) {
+                       } else if (vertex.getValue() == 2) {
                                stringValue = "two";
-                       }
-                       else if (vertex.getValue() == 3) {
+                       } else if (vertex.getValue() == 3) {
                                stringValue = "three";
-                       }
-                       else if (vertex.getValue() == 4) {
+                       } else if (vertex.getValue() == 4) {
                                stringValue = "four";
-                       }
-                       else if (vertex.getValue() == 5) {
+                       } else if (vertex.getValue() == 5) {
                                stringValue = "five";
-                       }
-                       else {
+                       } else {
                                stringValue = "";
                        }
                        return stringValue;
@@ -200,19 +195,19 @@ public class MapVerticesITCase extends 
MultipleProgramsTestBase {
        private static final class ToCustomTypeMapper implements 
MapFunction<Vertex<Long, Long>, DummyCustomType> {
                public DummyCustomType map(Vertex<Long, Long> vertex) throws 
Exception {
                        DummyCustomType dummyValue = new DummyCustomType();
-                       dummyValue.setIntField(vertex.getValue().intValue());   
                                        
+                       dummyValue.setIntField(vertex.getValue().intValue());
                        return dummyValue;
                }
        }
 
        @SuppressWarnings("serial")
-       private static final class ToCustomParametrizedTypeMapper implements 
MapFunction<Vertex<Long, Long>, 
+       private static final class ToCustomParametrizedTypeMapper implements 
MapFunction<Vertex<Long, Long>,
                DummyCustomParameterizedType<Double>> {
-               
+
                public DummyCustomParameterizedType<Double> map(Vertex<Long, 
Long> vertex) throws Exception {
                        DummyCustomParameterizedType<Double> dummyValue = new 
DummyCustomParameterizedType<>();
                        dummyValue.setIntField(vertex.getValue().intValue());
-                       dummyValue.setTField(new Double(vertex.getValue()));    
                                        
+                       dummyValue.setTField(new Double(vertex.getValue()));
                        return dummyValue;
                }
        }

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