pnowojski commented on a change in pull request #7031: 
[FLINK-10800][network][test] Abstract StreamPartitionerTest for common codes
URL: https://github.com/apache/flink/pull/7031#discussion_r231046754
 
 

 ##########
 File path: 
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/partitioner/ForwardPartitionerTest.java
 ##########
 @@ -29,31 +25,19 @@
 /**
  * Tests for {@link ForwardPartitioner}.
  */
-public class ForwardPartitionerTest {
-
-       private ForwardPartitioner<Tuple> forwardPartitioner;
-       private StreamRecord<Tuple> streamRecord = new 
StreamRecord<Tuple>(null);
-       private SerializationDelegate<StreamRecord<Tuple>> sd = new 
SerializationDelegate<StreamRecord<Tuple>>(
-                       null);
+public class ForwardPartitionerTest extends StreamPartitionerTest {
 
        @Before
        public void setPartitioner() {
-               forwardPartitioner = new ForwardPartitioner<Tuple>();
-       }
-
-       @Test
-       public void testSelectChannelsLength() {
-               sd.setInstance(streamRecord);
-               assertEquals(1, forwardPartitioner.selectChannels(sd, 
1).length);
-               assertEquals(1, forwardPartitioner.selectChannels(sd, 
2).length);
-               assertEquals(1, forwardPartitioner.selectChannels(sd, 
1024).length);
+               streamPartitioner = new ForwardPartitioner<>();
        }
 
        @Test
        public void testSelectChannelsInterval() {
                sd.setInstance(streamRecord);
-               assertEquals(0, forwardPartitioner.selectChannels(sd, 1)[0]);
-               assertEquals(0, forwardPartitioner.selectChannels(sd, 2)[0]);
-               assertEquals(0, forwardPartitioner.selectChannels(sd, 1024)[0]);
+
+               assertEquals(0, streamPartitioner.selectChannels(sd, 1)[0]);
 
 Review comment:
   I'm not sure if it's worth, but you could define
   ```
   assertSelectedChannel(int expectedChannel, StreamRecord record, int 
numberOfChannels) {
      serializationDelegate.setInstance(record);
      int[] actualResult = 
streamPartitioner.selectChannels(serializationDelegate, numberOfChannels);
      assertEquals(1, actualResult.length);
      assertEquals(expectedChannel, actualResult[0]);
   }
   ```

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