Github user StephanEwen commented on a diff in the pull request: https://github.com/apache/flink/pull/2723#discussion_r92588685 --- Diff: flink-core/src/test/java/org/apache/flink/api/common/typeutils/SerializerTestBase.java --- @@ -409,9 +402,26 @@ else if (should instanceof Throwable) { assertEquals(((Throwable)should).getMessage(), ((Throwable)is).getMessage()); } else { + // if toString() was overridden we must check it + if (!should.toString().equals(should.getClass().getName() + + "@" + Integer.toHexString(should.hashCode()))) { --- End diff -- This can be more robustly done by looking up the 'toString()' method and seeing if the defining class was `Object`.
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