[jira] [Created] (BEAM-882) Make ApiSurfaceTest detect the java package/module under test

["Kenneth Knowles (JIRA)" <ji...@apache.org>]

Kenneth Knowles created BEAM-882:
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             Summary: Make ApiSurfaceTest detect the java package/module under test
                 Key: BEAM-882
                 URL: https://issues.apache.org/jira/browse/BEAM-882
             Project: Beam
          Issue Type: Improvement
          Components: testing
    Affects Versions: Not applicable
            Reporter: Kenneth Knowles
             Fix For: Not applicable


{{ApiSurfaceTest}} in the {{sdks/java/core}} is the class responsible for protecting our public API surface.

This test walks the public signatures of all modules and explicitly verifies that everything is on a whitelist. This is how we control what dependencies we expose to our users, so that Beam can keep a tight, stable API surface.

We should improve this functionality to be reusable across modules.

Some desiderata for reuse:

* test automatically infers the module on which it should seed the API search.
* only 2 things in the file -- a whitelist and a ~1-line test that passes the whitelist as a parameter to some helper.
* test fails if there are things in the whitelist that are not exposed.

Any other cool things that are similar to what Maven enforcer does?

As an example of what you have to do without this functionality, see https://github.com/apache/incubator-beam/pull/1183



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