Hi folks and especially runner developers, https://issues.apache.org/jira/browse/BEAM-2506 - quoting from there:
Currently ValidatesRunner test suites run 1 pipeline per unit test. That's a lot of small pipelines, and consumes a lot of resources especially in case of a pretty heavyweight runner like Dataflow, so tests take a long time and can't be run in parallel due to quota issues, etc. Jason Kuster says he and Davor Bonaci discussed that we could execute multiple unit tests in a single TestPipeline. To further develop it: in case of Java, we could create a custom JUnit Runner http://junit.org/junit4/javadoc/4.12/org/junit/runner/Runner.html that would apply all the transforms and PAsserts in unit tests to a single instance of TestPipeline (per class, rather than per method), and run the whole thing at the end. PAssert captures the source location of its application, so we could still report which particular test failed. This obviously has fewer isolation between unit test methods, cause they effectively run in parallel instead of in sequence, so things like per-method setup and teardown will no longer be applicable. There'll probably be other issues. Anyway, this seems doable and high-impact. Just bringing this to the attention of the community - it seems worth discussing and perhaps someone will be interested in developing this idea further or implementing it.
