AHeise commented on a change in pull request #11515: [FLINK-16744][task] 
implement channel state persistence for unaligned checkpoints
URL: https://github.com/apache/flink/pull/11515#discussion_r400930355
 
 

 ##########
 File path: 
flink-table/flink-table-runtime-blink/src/test/java/org/apache/flink/table/runtime/operators/over/BufferDataOverWindowOperatorTest.java
 ##########
 @@ -205,9 +206,19 @@ public StreamConfig getOperatorConfig() {
 
                        @Override
                        public StreamTask<?, ?> getContainingTask() {
-                               StreamTask task = mock(StreamTask.class);
+                               class MockableStreamTask extends 
StreamTask<Object, StreamOperator<Object>> implements EnvironmentSupport {
+                                       MockableStreamTask() throws Exception {
+                                               super(new 
MockEnvironmentBuilder().build());
+                                       }
+
+                                       @Override
+                                       protected void init() {
+                                       }
+                               }
+
+                               StreamTask<?, ?> task = 
mock(MockableStreamTask.class);
                                Environment env = mock(Environment.class);
-                               when(task.getEnvironment()).thenReturn(env);
+                               when(task.getEnvironment()).thenReturn(new 
MockEnvironmentBuilder().build());
 
 Review comment:
   why is this line still necessary?

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