feat(CLI): --maxRelatedTestsDepth flag to control the depth of related test in --findRelatedTests #15495
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lewibs
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Summary
The company that I work for, has a test suite which is very slow to run. This is because of poorly structured code and long dependency trees. The developer time which is wasted as developers are waiting is approximately $200,000-$300,000 per year and often times, developers end up committing the code without testing it due to how long it takes. I have asked around and seen that this is often a problem that companies have and so know that many would appreciate the time savings that this would provide.
This PR adds the optional
--maxRelatedTestsDepthflag to the cli so that, when running jest with --findRelatedTests, the user has the ability to limit the depth of the BFS that is occurring. This is so that, for the local tests, we can limit testing to only the nearby files and stop testing once the dependency tree is deep enough that we are confident it no longer is related.Test plan
See findRelatedFiles.test.ts to see the tests that were created to validate that this code works as intended.
Path: e2e/tests/findRelatedFiles.test.ts