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https://issues.apache.org/jira/browse/BEAM-85?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174967#comment-15174967
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Kenneth Knowles commented on BEAM-85:
-------------------------------------
Another option is to make BeamAssert transparently a PTransform instead
mimicking English prose.
{code:java}
Pipeline p = TestPipeline.create();
p.apply(... /* do things ready */ ...)
.apply(BeamAssert.contains(/* expected */))
{code}
> DataflowAssert (BeamAssert ;) needs sanity check that it's used correctly
> -------------------------------------------------------------------------
>
> Key: BEAM-85
> URL: https://issues.apache.org/jira/browse/BEAM-85
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Daniel Halperin
> Assignee: Davor Bonaci
>
> It is important that assert is applied to pipeline before the pipeline is
> run, otherwise it does not actually execute the test.
> This code should throw an assertion error or fail in some other way.
> ```java
> {
> Pipeline p = TestPipeline.create();
> PCollection<Boolean> value = p.apply(Create.of(Boolean.FALSE));
> p.run();
> DataflowAssert.thatSingleton(value).isEqualTo(true);
> }
> ```
> but it would pass silently.
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