[jira] [Created] (FLINK-14741) Document pluggable sources and sinks in the production code for testing

[Sendoh (Jira)]

Sendoh created FLINK-14741:
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             Summary: Document pluggable sources and sinks in the production 
code for testing
                 Key: FLINK-14741
                 URL: https://issues.apache.org/jira/browse/FLINK-14741
             Project: Flink
          Issue Type: Wish
          Components: Documentation
            Reporter: Sendoh


As a user who writes test,

I would like to see an example of pluggable sources and sinks for testing, as 
mentioned here

[https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/testing.html#testing-flink-jobs]

, and like the example of testing stateful operator 

[https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/testing.html#unit-testing-stateful-or-timely-udfs--custom-operators]

to facilitate writing test



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