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https://issues.apache.org/jira/browse/BEAM-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078951#comment-16078951
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Robert Bradshaw commented on BEAM-2558:
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This is already implemented, though perhaps not discoverable enough:
https://github.com/apache/beam/blob/f62d04e22679ee2ac19e3ae37dec487d953d51c1/sdks/java/core/src/test/java/org/apache/beam/sdk/TestUtils.java#L131
> Add a CombineFnTester
> ---------------------
>
> Key: BEAM-2558
> URL: https://issues.apache.org/jira/browse/BEAM-2558
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Thomas Groh
> Assignee: Thomas Groh
>
> This should be in the style of {{CoderProperties}} or {{EqualsTester}}: the
> user should provide some inputs, and it should exercise potential paths by
> which those elements may be accumulated and ensure that they all produce the
> same results.
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