sjwiesman commented on a change in pull request #8437: [FLINK-12508] Expand
Testing Documentation
URL: https://github.com/apache/flink/pull/8437#discussion_r283963231
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File path: docs/dev/stream/testing.md
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@@ -23,138 +23,387 @@ specific language governing permissions and limitations
under the License.
-->
-This page briefly discusses how to test a Flink application in your IDE or a
local environment.
+Testing is an integral part of every software development process. As such
Apache Flink comes with tooling to test your Apache Flink application code on
different levels of the testing pyramid.
* This will be replaced by the TOC
{:toc}
-## Unit testing
+## Testing User-Defined Functions
-Usually, one can assume that Flink produces correct results outside of a
user-defined `Function`. Therefore, it is recommended to test `Function`
classes that contain the main business logic with unit tests as much as
possible.
+Usually, one can assume that Flink produces correct results outside of a
user-defined function. Therefore, it is recommended to test these classes that
contain the main business logic with unit tests as much as possible.
Review comment:
```suggestion
Usually, one can assume that Flink produces correct results outside of a
user-defined function. Therefore, it is recommended to test those classes that
contain the main business logic with unit tests as much as possible.
```
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