if(testCase.testFlatBufferSerialization() == TestCase.TestSerialization.BEFORE_EXEC || testCase.testFlatBufferSerialization() == TestCase.TestSerialization.BOTH){
            serializedBeforeExec = testCase.sameDiff().asFlatBuffers(true);
            Preconditions.checkNotNull(serializedBeforeExec, "Serialization failed? Null output");
        }