How do I run a single test using Jest?

Question

I have a test \'works with nested children\' within the file fix-order-test.js.

Running the below runs all the tests in the file.

jest fix-order-test         


        

Answer 1

Here is my take:

./node_modules/.bin/jest --config test/jest-unit-config.json --runInBand src/components/OpenForm/OpenForm.spec.js -t 'show expanded'

Notes:

• ./node_modules/.bin/... is a wonderful way, to access the locally installed Jest (or Mocha or...) binary that came with the locally installed package. (Yes, in your npm scripts you can jest with nothing before, but this is handy on command line... (that's also a good start for your debugging config, whichever IDE you are using...)
• Your project might not have a set of configuration options. But if it does (peek into the scripts in package.json), this is, what you need.
• --runInBand – as said, don't know about your configuration, but if you concentrate on developing/fixing a single test, you rather do not want to deal with web workers...
• Yes, you can give the whole, explicit path to your file
• Optionally, you can use -t to not run all tests in that file, but only a single one (here: the one, that has something with ‘show expanded’ in its name). Same effect can be achieved by glueing .only() into that file.