Mark Liu created BEAM-3810:
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             Summary: Add new matcher to check output file content for 
WordCountIT and WindowedWordCountIT
                 Key: BEAM-3810
                 URL: https://issues.apache.org/jira/browse/BEAM-3810
             Project: Beam
          Issue Type: Test
          Components: testing
            Reporter: Mark Liu
            Assignee: Mark Liu


Test use case like 
[https://github.com/apache/beam/pull/4755#discussion_r173254182] shows that 
verify lines of output for integration test makes the validation and debugging 
easier than simple verify checksum. We'd like to add a new matcher (like 
FileContentMatcher) to very lines given expected files.

This matcher can be applied to ITs that already use FileChecksumMatcher (etc. 
WordCountIT and WindowedWordCountIT).



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