[GitHub] [beam] kennknowles opened a new issue, #18039: Aggregator Verifier and Integrate to E2E Test Framework

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kennknowles opened a new issue, #18039:
URL: https://github.com/apache/beam/issues/18039

   Create a matcher to verify the value of [Aggregator](https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Aggregator.java), which is [AggregatorValues](https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/AggregatorValues.java), by given expected values.
   
   For example:
   ```
   
   MyFnWithAggregator fn = new MyFnWithAggregator();
   Pipeline p = ... (setup the pipeline, use fn) ...
   p.run();
   assertThat(pResult,
   isAggregatorValue(values, fn.aggregator));
   
   ```
   
   
   It also should be integrated in E2E pipeline test and used by setting onSuccessMatcher.
   
   Imported from Jira [BEAM-546](https://issues.apache.org/jira/browse/BEAM-546). Original Jira may contain additional context.
   Reported by: markflyhigh.


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