Jest parallelizes test runs and it doesn’t know upfront which tests it
should run and which it shouldn’t run.
This means when you use “fit”, it will only run one test in that file.
But it still runs all other test files in your project.
fit, fdescribe and it.only, describe.only have the same purpose: skip other tests and run only me.
Source: https://github.com/facebook/jest/issues/698#issuecomment-177673281
Use the Jest filtering mechanism. When you run your tests like,
jest --config=jest.config.json --watch
you can filter tests by a testname or filename. Just follow the instructions in the terminal.
Press p, and then type a filename.
Then you can use describe.only and it.only which will skip all other tests from the filtered, tested file.