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https://issues.apache.org/jira/browse/FLINK-7554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16413526#comment-16413526
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Timo Walther commented on FLINK-7554:
-------------------------------------
This issue is about adding utilities for unit testing of Flink functions. For
example, for a UDF like [EnrichmentFunction
|https://github.com/dataArtisans/flink-training-exercises/blob/master/src/main/java/com/dataartisans/flinktraining/exercises/datastream_java/process/JoinRidesWithFares.java]
we could use a testing RuntimeContext like:
{code}
// function to test
EnrichmentFunction func = new EnrichmentFunction();
// create context
TestingRuntimeContext testContext = new TestingRuntimeContext();
func.setRuntimeContext(testContext);
// do processing
func.processElement(...);
func.processElement(...);
// validate
Assert.equals(List(...), testContext.getValueStates())
{code}
> Add a testing RuntimeContext to test utilities
> ----------------------------------------------
>
> Key: FLINK-7554
> URL: https://issues.apache.org/jira/browse/FLINK-7554
> Project: Flink
> Issue Type: New Feature
> Components: Tests
> Reporter: Timo Walther
> Priority: Major
> Labels: starter
>
> When unit testing user-defined functions it would be useful to have an
> official testing {{RuntimeContext}} that uses Java collections for storing
> state, metrics, etc.
> After executing the business logic, the user could then verify how the state
> of the UDF changed or which metrics have been collected.
> This issue includes documentation for the "Testing" section.
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