[jira] [Created] (SPARK-12432) Make parts of the Spark testing API public to assist developers making their own tests.

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

holdenk created SPARK-12432:
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             Summary: Make parts of the Spark testing API public to assist developers making their own tests.
                 Key: SPARK-12432
                 URL: https://issues.apache.org/jira/browse/SPARK-12432
             Project: Spark
          Issue Type: Improvement
          Components: Tests
            Reporter: holdenk
            Priority: Trivial


	Apache Spark has a wide variety of internal tests, but many of the APIs used for testing are private. To allow external developers to easily test their Spark programs we should expose a minimal set of testing APIs. The spark-testing-base project provides a set of base classes based on the existing testing code in Spark we could use to fashion a public test API for Spark.

Since the tests for Streaming (and other components) depend on accessing Spark internals, maintaining these tests inside of Spark is a better fit than as an external component. Testing is also a core component of any project using Spark that moves beyond the proof-of-concept phase.

The proposed API (which is very much based on Spark's current internal API) is at https://docs.google.com/document/d/1FBg1qWbzjW0fKt6YxzNEn7vJ7l2y1ZfeM0CSP3JJIBI/edit?usp=sharing .

This issue can be broken up into three sub issues to expose testing utils for core, streaming, and sql.



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