[jira] [Created] (BEAM-455) Implement a test harness for verifying correcness of custom sources

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

Chamikara Jayalath created BEAM-455:
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             Summary: Implement a test harness for verifying correcness of custom sources
                 Key: BEAM-455
                 URL: https://issues.apache.org/jira/browse/BEAM-455
             Project: Beam
          Issue Type: New Feature
          Components: sdk-py
            Reporter: Chamikara Jayalath
            Assignee: Chamikara Jayalath


Verifying correctness of custom sources can be tricky, for example, due to  complex interactions patterns that can occur when performing dynamic work rebalancing.

Having a test harness with utilities for easily testing sources will be extremely useful for users.

The proposed test harness will be similar to the one that is already available for Java SDK [1] but will be adjusted to match the Python custom source API.

[1] https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/testing/SourceTestUtils.java



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