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jiabaosun pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/flink.git

commit 4bba35fa1f02a6a92e0db2d0e131c9a17bf17125
Author: Jiabao Sun <[email protected]>
AuthorDate: Mon Mar 4 14:22:44 2024 +0800

    [FLINK-25544][streaming][JUnit5 Migration] The graph package of module 
flink-stream-java
---
 .../graph/StreamGraphCoLocationConstraintTest.java | 30 ++++----
 .../StreamingJobGraphGeneratorNodeHashTest.java    | 89 +++++++++++-----------
 .../flink/streaming/graph/TranslationTest.java     | 55 ++++++-------
 .../graph/WithMasterCheckpointHookConfigTest.java  | 19 ++---
 4 files changed, 88 insertions(+), 105 deletions(-)

diff --git 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamGraphCoLocationConstraintTest.java
 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamGraphCoLocationConstraintTest.java
index 0534a30ed89..0edc13630d6 100644
--- 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamGraphCoLocationConstraintTest.java
+++ 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamGraphCoLocationConstraintTest.java
@@ -25,19 +25,18 @@ import 
org.apache.flink.streaming.api.datastream.DataStreamSink;
 import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
 import org.apache.flink.streaming.api.functions.sink.v2.DiscardingSink;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.util.List;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.fail;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /** Test that check the hidden API to set co location constraints on the 
stream transformations. */
-public class StreamGraphCoLocationConstraintTest {
+class StreamGraphCoLocationConstraintTest {
 
     @Test
-    public void testSettingCoLocationConstraint() throws Exception {
+    void testSettingCoLocationConstraint() {
         final StreamExecutionEnvironment env = 
StreamExecutionEnvironment.getExecutionEnvironment();
         env.setParallelism(7);
 
@@ -56,19 +55,21 @@ public class StreamGraphCoLocationConstraintTest {
 
         // get the graph
         final JobGraph jobGraph = env.getStreamGraph().getJobGraph();
-        assertEquals(4, jobGraph.getNumberOfVertices());
+        assertThat(jobGraph.getNumberOfVertices()).isEqualTo(4);
 
         List<JobVertex> vertices = 
jobGraph.getVerticesSortedTopologicallyFromSources();
         for (JobVertex vertex : vertices) {
-            assertNotNull(vertex.getCoLocationGroup());
+            assertThat(vertex.getCoLocationGroup()).isNotNull();
         }
 
-        assertEquals(vertices.get(0).getCoLocationGroup(), 
vertices.get(2).getCoLocationGroup());
-        assertEquals(vertices.get(1).getCoLocationGroup(), 
vertices.get(3).getCoLocationGroup());
+        assertThat(vertices.get(0).getCoLocationGroup())
+                .isEqualTo(vertices.get(2).getCoLocationGroup());
+        assertThat(vertices.get(1).getCoLocationGroup())
+                .isEqualTo(vertices.get(3).getCoLocationGroup());
     }
 
     @Test
-    public void testCoLocateDifferenSharingGroups() throws Exception {
+    void testCoLocateDifferenSharingGroups() {
         final StreamExecutionEnvironment env = 
StreamExecutionEnvironment.getExecutionEnvironment();
         env.setParallelism(7);
 
@@ -90,10 +91,7 @@ public class StreamGraphCoLocationConstraintTest {
         result.getTransformation().setCoLocationGroupKey("co2");
 
         // get the graph
-        try {
-            env.getStreamGraph().getJobGraph();
-            fail("exception expected");
-        } catch (IllegalStateException ignored) {
-        }
+        assertThatThrownBy(() -> env.getStreamGraph().getJobGraph())
+                .isInstanceOf(IllegalStateException.class);
     }
 }
diff --git 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamingJobGraphGeneratorNodeHashTest.java
 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamingJobGraphGeneratorNodeHashTest.java
index 5235c31e9d3..b37ecd8b098 100644
--- 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamingJobGraphGeneratorNodeHashTest.java
+++ 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/StreamingJobGraphGeneratorNodeHashTest.java
@@ -31,9 +31,8 @@ import 
org.apache.flink.streaming.api.functions.sink.v2.DiscardingSink;
 import org.apache.flink.streaming.api.functions.source.ParallelSourceFunction;
 import org.apache.flink.streaming.api.graph.StreamGraph;
 import org.apache.flink.streaming.api.graph.StreamNode;
-import org.apache.flink.util.TestLogger;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.util.HashMap;
 import java.util.HashSet;
@@ -41,18 +40,15 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /**
  * Tests the {@link StreamNode} hash assignment during translation from {@link 
StreamGraph} to
  * {@link JobGraph} instances.
  */
 @SuppressWarnings("serial")
-public class StreamingJobGraphGeneratorNodeHashTest extends TestLogger {
+class StreamingJobGraphGeneratorNodeHashTest {
 
     // ------------------------------------------------------------------------
     // Deterministic hash assignment
@@ -70,7 +66,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
      * </pre>
      */
     @Test
-    public void testNodeHashIsDeterministic() throws Exception {
+    void testNodeHashIsDeterministic() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
 
@@ -133,7 +129,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
      * </pre>
      */
     @Test
-    public void testNodeHashIdenticalSources() throws Exception {
+    void testNodeHashIdenticalSources() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
         env.disableOperatorChaining();
@@ -146,13 +142,13 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
         JobGraph jobGraph = env.getStreamGraph().getJobGraph();
 
         List<JobVertex> vertices = 
jobGraph.getVerticesSortedTopologicallyFromSources();
-        assertTrue(vertices.get(0).isInputVertex());
-        assertTrue(vertices.get(1).isInputVertex());
+        assertThat(vertices.get(0).isInputVertex()).isTrue();
+        assertThat(vertices.get(1).isInputVertex()).isTrue();
 
-        assertNotNull(vertices.get(0).getID());
-        assertNotNull(vertices.get(1).getID());
+        assertThat(vertices.get(0).getID()).isNotNull();
+        assertThat(vertices.get(1).getID()).isNotNull();
 
-        assertNotEquals(vertices.get(0).getID(), vertices.get(1).getID());
+        
assertThat(vertices.get(0).getID()).isNotEqualTo(vertices.get(1).getID());
     }
 
     /**
@@ -166,7 +162,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
      * <p>The hashes for the single vertex in A and the source vertex in B 
need to be different.
      */
     @Test
-    public void testNodeHashAfterSourceUnchaining() throws Exception {
+    void testNodeHashAfterSourceUnchaining() throws Exception {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
 
@@ -193,7 +189,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
         JobVertexID unchainedSourceId =
                 
jobGraph.getVerticesSortedTopologicallyFromSources().get(0).getID();
 
-        assertNotEquals(sourceId, unchainedSourceId);
+        assertThat(unchainedSourceId).isNotEqualTo(sourceId);
     }
 
     /**
@@ -207,7 +203,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
      * <p>The hashes for the single vertex in A and the source vertex in B 
need to be different.
      */
     @Test
-    public void testNodeHashAfterIntermediateUnchaining() throws Exception {
+    void testNodeHashAfterIntermediateUnchaining() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
 
@@ -221,7 +217,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
         JobGraph jobGraph = env.getStreamGraph().getJobGraph();
 
         JobVertex chainedMap = 
jobGraph.getVerticesSortedTopologicallyFromSources().get(1);
-        assertTrue(chainedMap.getName().startsWith("map"));
+        assertThat(chainedMap.getName()).startsWith("map");
         JobVertexID chainedMapId = chainedMap.getID();
 
         env = StreamExecutionEnvironment.createLocalEnvironment();
@@ -238,10 +234,10 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
         jobGraph = env.getStreamGraph().getJobGraph();
 
         JobVertex unchainedMap = 
jobGraph.getVerticesSortedTopologicallyFromSources().get(1);
-        assertEquals("map", unchainedMap.getName());
+        assertThat(unchainedMap.getName()).isEqualTo("map");
         JobVertexID unchainedMapId = unchainedMap.getID();
 
-        assertNotEquals(chainedMapId, unchainedMapId);
+        assertThat(unchainedMapId).isNotEqualTo(chainedMapId);
     }
 
     /**
@@ -255,7 +251,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
      * </pre>
      */
     @Test
-    public void testNodeHashIdenticalNodes() throws Exception {
+    void testNodeHashIdenticalNodes() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
         env.disableOperatorChaining();
@@ -269,13 +265,13 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
         JobGraph jobGraph = env.getStreamGraph().getJobGraph();
         Set<JobVertexID> vertexIds = new HashSet<>();
         for (JobVertex vertex : jobGraph.getVertices()) {
-            assertTrue(vertexIds.add(vertex.getID()));
+            assertThat(vertexIds.add(vertex.getID())).isTrue();
         }
     }
 
     /** Tests that a changed operator name does not affect the hash. */
     @Test
-    public void testChangedOperatorName() throws Exception {
+    void testChangedOperatorName() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.addSource(new NoOpSourceFunction(), "A").map(new 
NoOpMapFunction());
         JobGraph jobGraph = env.getStreamGraph().getJobGraph();
@@ -288,7 +284,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
 
         JobVertexID actual = jobGraph.getVerticesAsArray()[0].getID();
 
-        assertEquals(expected, actual);
+        assertThat(actual).isEqualTo(expected);
     }
 
     // ------------------------------------------------------------------------
@@ -311,7 +307,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
      * </pre>
      */
     @Test
-    public void testManualHashAssignment() throws Exception {
+    void testManualHashAssignment() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
         env.disableOperatorChaining();
@@ -326,7 +322,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
         JobGraph jobGraph = env.getStreamGraph().getJobGraph();
         Set<JobVertexID> ids = new HashSet<>();
         for (JobVertex vertex : jobGraph.getVertices()) {
-            assertTrue(ids.add(vertex.getID()));
+            assertThat(ids.add(vertex.getID())).isTrue();
         }
 
         // Resubmit a slightly different program
@@ -356,7 +352,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
                 .uid("sink1");
 
         JobGraph newJobGraph = env.getStreamGraph().getJobGraph();
-        assertNotEquals(jobGraph.getJobID(), newJobGraph.getJobID());
+        assertThat(newJobGraph.getJobID()).isNotEqualTo(jobGraph.getJobID());
 
         for (JobVertex vertex : newJobGraph.getVertices()) {
             // Verify that the expected IDs are the same
@@ -364,14 +360,14 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
                     || vertex.getName().endsWith("sink0")
                     || vertex.getName().endsWith("sink1")) {
 
-                assertTrue(ids.contains(vertex.getID()));
+                assertThat(vertex.getID()).isIn(ids);
             }
         }
     }
 
     /** Tests that a collision on the manual hash throws an Exception. */
-    @Test(expected = IllegalArgumentException.class)
-    public void testManualHashAssignmentCollisionThrowsException() throws 
Exception {
+    @Test
+    void testManualHashAssignmentCollisionThrowsException() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
         env.disableOperatorChaining();
@@ -383,12 +379,13 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
                 .sinkTo(new DiscardingSink<>());
 
         // This call is necessary to generate the job graph
-        env.getStreamGraph().getJobGraph();
+        assertThatThrownBy(() -> env.getStreamGraph().getJobGraph())
+                .isInstanceOf(IllegalArgumentException.class);
     }
 
     /** Tests that a manual hash for an intermediate chain node is accepted. */
     @Test
-    public void testManualHashAssignmentForIntermediateNodeInChain() throws 
Exception {
+    void testManualHashAssignmentForIntermediateNodeInChain() throws Exception 
{
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
 
@@ -403,7 +400,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
 
     /** Tests that a manual hash at the beginning of a chain is accepted. */
     @Test
-    public void testManualHashAssignmentForStartNodeInInChain() throws 
Exception {
+    void testManualHashAssignmentForStartNodeInInChain() throws Exception {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.setParallelism(4);
 
@@ -416,7 +413,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
     }
 
     @Test
-    public void testUserProvidedHashingOnChainSupported() {
+    void testUserProvidedHashingOnChainSupported() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
 
         env.addSource(new NoOpSourceFunction(), "src")
@@ -433,17 +430,18 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
         env.getStreamGraph().getJobGraph();
     }
 
-    @Test(expected = IllegalStateException.class)
-    public void testDisablingAutoUidsFailsStreamGraphCreation() {
+    @Test
+    void testDisablingAutoUidsFailsStreamGraphCreation() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.getConfig().disableAutoGeneratedUIDs();
 
         env.addSource(new NoOpSourceFunction()).sinkTo(new DiscardingSink<>());
-        env.getStreamGraph();
+
+        
assertThatThrownBy(env::getStreamGraph).isInstanceOf(IllegalStateException.class);
     }
 
     @Test
-    public void testDisablingAutoUidsAcceptsManuallySetId() {
+    void testDisablingAutoUidsAcceptsManuallySetId() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.getConfig().disableAutoGeneratedUIDs();
 
@@ -456,7 +454,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
     }
 
     @Test
-    public void testDisablingAutoUidsAcceptsManuallySetHash() {
+    void testDisablingAutoUidsAcceptsManuallySetHash() {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.getConfig().disableAutoGeneratedUIDs();
 
@@ -470,7 +468,7 @@ public class StreamingJobGraphGeneratorNodeHashTest extends 
TestLogger {
     }
 
     @Test
-    public void testDisablingAutoUidsWorksWithKeyBy() throws Exception {
+    void testDisablingAutoUidsWorksWithKeyBy() throws Exception {
         StreamExecutionEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment();
         env.getConfig().disableAutoGeneratedUIDs();
 
@@ -501,13 +499,12 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
      */
     private void verifyIdsEqual(JobGraph jobGraph, Map<JobVertexID, String> 
ids) {
         // Verify same number of vertices
-        assertEquals(jobGraph.getNumberOfVertices(), ids.size());
+        assertThat(ids).hasSize(jobGraph.getNumberOfVertices());
 
         // Verify that all IDs->name mappings are identical
         for (JobVertex vertex : jobGraph.getVertices()) {
             String expectedName = ids.get(vertex.getID());
-            assertNotNull(expectedName);
-            assertEquals(expectedName, vertex.getName());
+            assertThat(vertex.getName()).isNotNull().isEqualTo(expectedName);
         }
     }
 
@@ -516,11 +513,11 @@ public class StreamingJobGraphGeneratorNodeHashTest 
extends TestLogger {
      */
     private void verifyIdsNotEqual(JobGraph jobGraph, Map<JobVertexID, String> 
ids) {
         // Verify same number of vertices
-        assertEquals(jobGraph.getNumberOfVertices(), ids.size());
+        assertThat(ids).hasSize(jobGraph.getNumberOfVertices());
 
         // Verify that all IDs->name mappings are identical
         for (JobVertex vertex : jobGraph.getVertices()) {
-            assertFalse(ids.containsKey(vertex.getID()));
+            assertThat(ids).doesNotContainKey(vertex.getID());
         }
     }
 
diff --git 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/TranslationTest.java
 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/TranslationTest.java
index 22ebebdcd8a..299b217ff2c 100644
--- 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/TranslationTest.java
+++ 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/TranslationTest.java
@@ -24,47 +24,38 @@ import 
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
 import org.apache.flink.streaming.api.functions.sink.SinkFunction;
 import org.apache.flink.streaming.api.graph.StreamConfig;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.fail;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /** Test translation of {@link CheckpointingMode}. */
 @SuppressWarnings("serial")
-public class TranslationTest {
+class TranslationTest {
 
     @Test
-    public void testCheckpointModeTranslation() {
-        try {
-            // with deactivated fault tolerance, the checkpoint mode should be 
at-least-once
-            StreamExecutionEnvironment deactivated = getSimpleJob();
+    void testCheckpointModeTranslation() {
+        // with deactivated fault tolerance, the checkpoint mode should be 
at-least-once
+        StreamExecutionEnvironment deactivated = getSimpleJob();
 
-            for (JobVertex vertex : 
deactivated.getStreamGraph().getJobGraph().getVertices()) {
-                assertEquals(
-                        CheckpointingMode.AT_LEAST_ONCE,
-                        new 
StreamConfig(vertex.getConfiguration()).getCheckpointMode());
-            }
+        for (JobVertex vertex : 
deactivated.getStreamGraph().getJobGraph().getVertices()) {
+            assertThat(new 
StreamConfig(vertex.getConfiguration()).getCheckpointMode())
+                    .isEqualTo(CheckpointingMode.AT_LEAST_ONCE);
+        }
 
-            // with activated fault tolerance, the checkpoint mode should be 
by default exactly once
-            StreamExecutionEnvironment activated = getSimpleJob();
-            activated.enableCheckpointing(1000L);
-            for (JobVertex vertex : 
activated.getStreamGraph().getJobGraph().getVertices()) {
-                assertEquals(
-                        CheckpointingMode.EXACTLY_ONCE,
-                        new 
StreamConfig(vertex.getConfiguration()).getCheckpointMode());
-            }
+        // with activated fault tolerance, the checkpoint mode should be by 
default exactly once
+        StreamExecutionEnvironment activated = getSimpleJob();
+        activated.enableCheckpointing(1000L);
+        for (JobVertex vertex : 
activated.getStreamGraph().getJobGraph().getVertices()) {
+            assertThat(new 
StreamConfig(vertex.getConfiguration()).getCheckpointMode())
+                    .isEqualTo(CheckpointingMode.EXACTLY_ONCE);
+        }
 
-            // explicitly setting the mode
-            StreamExecutionEnvironment explicit = getSimpleJob();
-            explicit.enableCheckpointing(1000L, 
CheckpointingMode.AT_LEAST_ONCE);
-            for (JobVertex vertex : 
explicit.getStreamGraph().getJobGraph().getVertices()) {
-                assertEquals(
-                        CheckpointingMode.AT_LEAST_ONCE,
-                        new 
StreamConfig(vertex.getConfiguration()).getCheckpointMode());
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
-            fail(e.getMessage());
+        // explicitly setting the mode
+        StreamExecutionEnvironment explicit = getSimpleJob();
+        explicit.enableCheckpointing(1000L, CheckpointingMode.AT_LEAST_ONCE);
+        for (JobVertex vertex : 
explicit.getStreamGraph().getJobGraph().getVertices()) {
+            assertThat(new 
StreamConfig(vertex.getConfiguration()).getCheckpointMode())
+                    .isEqualTo(CheckpointingMode.AT_LEAST_ONCE);
         }
     }
 
diff --git 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/WithMasterCheckpointHookConfigTest.java
 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/WithMasterCheckpointHookConfigTest.java
index 01800d1a6da..3026e9b9ba4 100644
--- 
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/WithMasterCheckpointHookConfigTest.java
+++ 
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/graph/WithMasterCheckpointHookConfigTest.java
@@ -28,9 +28,8 @@ import 
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
 import org.apache.flink.streaming.api.functions.sink.v2.DiscardingSink;
 import org.apache.flink.streaming.api.functions.source.SourceFunction;
 import org.apache.flink.util.SerializedValue;
-import org.apache.flink.util.TestLogger;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import javax.annotation.Nullable;
 
@@ -40,23 +39,21 @@ import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executor;
 
 import static java.util.Arrays.asList;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * Tests that when sources implement {@link WithMasterCheckpointHook} the 
hooks are properly
  * configured in the job's checkpoint settings.
  */
 @SuppressWarnings("serial")
-public class WithMasterCheckpointHookConfigTest extends TestLogger {
+class WithMasterCheckpointHookConfigTest {
 
     /**
      * This test creates a program with 4 sources (2 with master hooks, 2 
without). The resulting
      * job graph must have 2 configured master hooks.
      */
     @Test
-    public void testHookConfiguration() throws Exception {
+    void testHookConfiguration() throws Exception {
         // create some sources some of which configure master hooks
         final TestSource source1 = new TestSource();
         final TestSourceWithHook source2 = new TestSourceWithHook("foo");
@@ -90,18 +87,18 @@ public class WithMasterCheckpointHookConfigTest extends 
TestLogger {
 
         SerializedValue<Factory[]> serializedConfiguredHooks =
                 jg.getCheckpointingSettings().getMasterHooks();
-        assertNotNull(serializedConfiguredHooks);
+        assertThat(serializedConfiguredHooks).isNotNull();
 
         Factory[] configuredHooks =
                 
serializedConfiguredHooks.deserializeValue(getClass().getClassLoader());
-        assertEquals(hooks.size(), configuredHooks.length);
+        assertThat(configuredHooks).hasSameSizeAs(hooks);
 
         // check that all hooks are contained and exist exactly once
         for (Factory f : configuredHooks) {
             MasterTriggerRestoreHook<?> hook = f.create();
-            assertTrue(hooks.remove(hook));
+            assertThat(hooks.remove(hook)).isTrue();
         }
-        assertTrue(hooks.isEmpty());
+        assertThat(hooks).isEmpty();
     }
 
     // -----------------------------------------------------------------------

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