Apache flink Flink TestHarness输出不'；托收后不清

我有以下测试：

testHarness.processElement2(new StreamRecord<>(element1));
testHarness.processElement1(new StreamRecord<>(new Tuple2<>(id, element2)));

testHarness.setProcessingTime(1); //let's assume it's the correct time for the timer inside the function
softly.assertThat(testHarness.getOutput()).containsExactly(new StreamRecord<>(expectedResult)); //this one is passed

testHarness.setProcessingTime(2); // setting second timer which will trigger different timer
softly.assertThat(testHarness.getOutput()).containsExactly(new StreamRecord<>(expectedResult2)); //fails cause output has  expectedResult & expectedResult2

testHarness.processElement2（新的StreamRecord（element1））；
processElement1（新的StreamRecord（新的Tuple2（id，element2））；
testHarness.setProcessingTime（1）//让我们假设这是函数中计时器的正确时间
assertThat（testHarness.getOutput（））.containsActly（newstreamrecord（expectedResult））//这个通过了
testHarness.setProcessingTime（2）；//设置将触发不同计时器的第二个计时器
assertThat（testHarness.getOutput（））.containsActly（新的StreamRecord（expectedResult2））//失败原因输出有expectedResult和expectedResult2

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为什么TestHarness在调用getOutput（）后不清除其元素？是否可以通过某种方式实现此功能？

这可以通过在输出上调用clear（）来实现：

testHarness.processElement2(new StreamRecord<>(element1));
testHarness.processElement1(new StreamRecord<>(new Tuple2<>(id, element2)));

testHarness.setProcessingTime(1); //let's assume it's the correct time for the timer inside the function
softly.assertThat(testHarness.getOutput()).containsExactly(new StreamRecord<>(expectedResult)); // Pass

testHarness.getOutput().clear();

testHarness.setProcessingTime(2); // setting second timer which will trigger different timer
softly.assertThat(testHarness.getOutput()).containsExactly(new StreamRecord<>(expectedResult2)); // Pass

testHarness.processElement2（新的StreamRecord（element1））；
processElement1（新的StreamRecord（新的Tuple2（id，element2））；
testHarness.setProcessingTime（1）//让我们假设这是函数中计时器的正确时间
.assertThat（testHarness.getOutput（））.containsActly（新的StreamRecord（expectedResult））；//通过
testHarness.getOutput（）.clear（）；
testHarness.setProcessingTime（2）；//设置将触发不同计时器的第二个计时器
.assertThat（testHarness.getOutput（））.containsActly（新的StreamRecord（expectedResult2））；//通过