tell-jest-to-focus-on-running-only-one-test.md

Tell Jest To Focus On Running Only One Test

Test output can be noisy. Sometimes one test is inadvertently dependent on another. These are some of the reasons you may want to tell Jest to focus in and only run one particular test block.

You can do this by calling test.only() instead of test().

Find the test block you are interested in focusing on and update it to look like this:

// tests above ...

test.only('ensure the function returns the value', () => {
  // ...
  // test implementation
  // ...
})

// tests below ...

With that 5-character addition (.only) we instruct Jest to run that one test while skipping all others.

This is particularly useful when you are doing some console.log debugging of a test. You can eliminate any confusion about which test is logging out by only running one test.

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