[jira] [Created] (BEAM-520) Update Python SDK example tests to use assert_that

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

Ahmet Altay created BEAM-520:
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             Summary: Update Python SDK example tests to use assert_that
                 Key: BEAM-520
                 URL: https://issues.apache.org/jira/browse/BEAM-520
             Project: Beam
          Issue Type: Improvement
          Components: sdk-py
            Reporter: Ahmet Altay
            Priority: Minor


Most of our examples use assert_that to test examples:

https://github.com/apache/incubator-beam/blob/python-sdk/sdks/python/apache_beam/examples/complete/autocomplete_test.py#L38

Some of our examples use this pattern:

1) Create a path(s)
2) Construct fake command line arguments using these paths
3) Construct an argparse object to parse these flags
4) Do the (often trivial logic)
5) Write to a file
6) Manually open and read the file
7) Compare results. 

https://github.com/apache/incubator-beam/blob/python-sdk/sdks/python/apache_beam/examples/cookbook/multiple_output_pardo_test.py

As well as being cumbersome, this obscures the core of what is being illustrated and tested. As many as possible tests should be updated to use assert_that.



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