ASF GitHub Bot logged work on BEAM-3377:

                Author: ASF GitHub Bot
            Created on: 18/May/18 05:10
            Start Date: 18/May/18 05:10
    Worklog Time Spent: 10m 
      Work Description: aaltay commented on a change in pull request #5384: 
[BEAM-3377] Add validation for streaming wordcount with assert_that
URL: https://github.com/apache/beam/pull/5384#discussion_r189163531

 File path: sdks/python/apache_beam/examples/streaming_wordcount_debugging.py
 @@ -0,0 +1,179 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#    http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""An example to use assert_that to validate streaming wordcount.
 Review comment:
   Let's change this text to something that will resonate more to a user. It is 
a streaming wordcount example, that demonstrates the use of logging and 
assert_that in streaming mode. Rest are details, that are more suitable for the 
commit message, please remove them from the comment.
   Also please add a note, mentioning that this example only works in 
DirectRunner with a reference to the issue.

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Issue Time Tracking

    Worklog Id:     (was: 103222)
    Time Spent: 4h 20m  (was: 4h 10m)

> assert_that not working for streaming
> -------------------------------------
>                 Key: BEAM-3377
>                 URL: https://issues.apache.org/jira/browse/BEAM-3377
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>    Affects Versions: 2.2.0
>            Reporter: MarĂ­a GH
>            Priority: Major
>              Labels: starter
>          Time Spent: 4h 20m
>  Remaining Estimate: 0h
> assert_that does not work for AfterWatermark timers.
> Easy way to reproduce: modify test_gbk_execution [1] in this form:
> {code:java}
>  def test_this(self):
>     test_stream = (TestStream()
>                    .add_elements(['a', 'b', 'c'])
>                    .advance_watermark_to(20))
>     def fnc(x):
>       print 'fired_elem:', x
>       return x
>     options = PipelineOptions()
>     options.view_as(StandardOptions).streaming = True
>     p = TestPipeline(options=options)
>     records = (p
>                | test_stream
>                | beam.WindowInto(
>                    FixedWindows(15),
> trigger=trigger.AfterWatermark(early=trigger.AfterCount(2)),
>                    accumulation_mode=trigger.AccumulationMode.ACCUMULATING)
>                | beam.Map(lambda x: ('k', x))
>                | beam.GroupByKey())
>     assert_that(records, equal_to([
>         ('k', ['a', 'b', 'c'])]))
>     p.run()
> {code}
> This test will pass, but if the .advance_watermark_to(20) is removed, the 
> test will fail. However, both cases fire the same elements:
>       fired_elem: ('k', ['a', 'b', 'c'])
>       fired_elem: ('k', ['a', 'b', 'c'])
> In the passing case, they correspond to the sorted_actual inside the 
> assert_that. In the failing case:
>       sorted_actual: [('k', ['a', 'b', 'c']), ('k', ['a', 'b', 'c'])]
>       sorted_actual: []
> [1] 
> https://github.com/mariapython/incubator-beam/blob/direct-timers-show/sdks/python/apache_beam/testing/test_stream_test.py#L120

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