Why does setting Maven surefire forkMode to never speed up my unit tests?

StackOverflow https://stackoverflow.com/questions/12298681

  •  30-06-2021
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Question

With the maven surefire plugin I can set forkMode to never - doing this speeds up execution on 1000 unit tests from 7 minutes to 1:40.

Why is this making such a difference?

Was it helpful?

Solution

I turned on debug for maven and it became clear the pom was referencing a parent pom version which was setting forkMode=always for the surefire plugin, overriding the default value.

OTHER TIPS

The default value of forkMode is once. This means surefire creates a separate JVM to run the tests. Seems on your build system, creating and cleaning up the extra JVM is taking a while.

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