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[Feature]: Configure jest to fail (non-zero exit) if test suite does not cleanly exit
🚀 Feature Proposal
Add a cli flag/config setting that causes jest to fail (exit with non-zero exit code), rather than printing the message:
Jest did not exit one second after the test run has completed.
Motivation
We would like to catch any instance of "open handles" in a test in our automated checks, since it is always the result of a programming mistake.
Example
jest --failOnOpenHandles
or perhaps
jest --failOnForceExit
...plus commensurate config file syntax
I don't have a strong opinion about the exact wording; "handles" is used in the detectOpenHandles
setting, "forcedExit" is used in the runner source code.
Pitch
The code that needs changed is here: https://github.com/jestjs/jest/blob/91e80829a08b03ed7c0166e59543cd2a6b20d08b/packages/jest-runner/src/index.ts#L186
This is in the runner, and it doesn't currently provide an obvious extensibility point.
NOTE! I've only looked at the jest codebase for under an hour -- I could definitely be missing some other way to accomplish this.