[ 
https://issues.apache.org/jira/browse/BEAM-85?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Daniel Halperin updated BEAM-85:
--------------------------------
    Description: 
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.

{code}
Pipeline p = TestPipeline.create();
PCollection<Boolean> value = p.apply(Create.of(Boolean.FALSE));
p.run();

DataflowAssert.thatSingleton(value).isEqualTo(true);
{code}

but it would pass silently.

  was:
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.


> 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
>
> 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.
> {code}
> Pipeline p = TestPipeline.create();
> PCollection<Boolean> value = p.apply(Create.of(Boolean.FALSE));
> p.run();
> DataflowAssert.thatSingleton(value).isEqualTo(true);
> {code}
> but it would pass silently.



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