XComp commented on a change in pull request #15640:
URL: https://github.com/apache/flink/pull/15640#discussion_r615737641



##########
File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/scheduler/exceptionhistory/FailureHandlingResultSnapshotTest.java
##########
@@ -115,7 +156,12 @@ public void 
testLocalFailureHandlingResultSnapshotCreation() {
                 FailureHandlingResultSnapshot.create(
                         failureHandlingResult, this::getExecutionVertex);
 
-        assertThat(testInstance.getRootCause(), is(rootCause));
+        // SerializableThrowable needs to be wrapped around to expose the 
deserializeError method -
+        // the check would fail, otherwise.
+        assertThat(
+                new SerializedThrowable(testInstance.getRootCause())
+                        .deserializeError(ClassLoader.getSystemClassLoader()),
+                is(rootCause));

Review comment:
       Good catch. I did some code changes afterwards that made the wrapping 
obsolete. 👍 




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