I am using Jest in a monorepo. I am using create-react-app and so am configuring with CRACO. Below is the Jest section of my CRACO config. With jestConfig.projects = ["<rootDir>/packages/*"]; commented out, each test runs once. But when it is un-commented, each test is run multiple times, making my Jest calls take a long time.
I'd like to be able to take advantage of parallelization with projects, which should make my tests run more quickly, not more slowly.
How can I prevent the redundant test runs and take advantage of parallelization?
jest: {
configure: (jestConfig, { env, paths, resolve, rootDir }) => {
// jestConfig.projects = ["<rootDir>/packages/*"]; un-commenting causes each test to be run repeatedly
jestConfig.roots = ["."];
jestConfig.setupFiles = ["./jest.overrides.js"];
jestConfig.setupFilesAfterEnv = ["./setupTests.js"];
jestConfig.testMatch = [
"<rootDir>/packages/**/*.{spec,test}.{js,jsx,ts,tsx}",
];
return jestConfig;
},
},
Screenshot of test run with projects enabled:
Screenshot of test run with projects commented out:
