Run tests on just your changed files with jest -o

You can specify the particular test file you want to run with a pattern, like jest Layout, which will run only tests whose file paths contain "Layout". But if you want a general command that will always run just the tests for files you've changed since your last commit, use jest --onlyChanged, or jest -o for short. Combined with watch, you can use this single command for all your regular development.

jest -o --watch

If you want to run tests for all files changed since a certain commit or branch (e.g. if you're working on a feature branch and want to test all the changed files in that branch), then use jest --changedSince master, where master is that branch you branched off from.

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