jest --watch runs tests twice after editing a file

[kumar303]

Describe the problem and steps to reproduce it:

Run yarn test, edit a file.

What happened?

Sometimes the tests are run twice

What did you expect to happen?

They should only be run once for each file change

Anything else we should know?

This is happening because our WebpackIsomorphicToolsPlugin auto-generates a webpack-assets.json file. The change to this file triggers a second test run.

It is not yet possible to ignore changes to this file and I haven't found a good workaround yet.

[kumar303]

To clarify: the webpack-assets.json file is only getting generated because of yarn dev:amo (which is typically running in a separate shell for me) which has its own watcher/builder.

[muffinresearch]

@kumar303 is this still happening?

[kumar303]

Yes but there is now an option called watchPatchIgnorePatterns that we can use to fix it! I think we just need to ignore all the things that webpack touches on a rebuild (sri.json? I forget).