Ahmet Altay commented on BEAM-520:

Thank you for noticing this. I can reproduce the error at head. This is not 
related to your change. I created 
(https://issues.apache.org/jira/browse/BEAM-753) for this and looking at it.

> 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
>              Labels: starter
> 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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