jest.config.js

module.exports = {
    roots: [
        "<rootDir>/src"
    ],
    transform: {
        "^.+\\.(js|jsx)?$": "babel-jest"
    },
    testMatch: [
        //it looks inside src/ for .js, .jsx, .ts and .tsx files, as well as any files with a suffix of .test or .spec
        "<rootDir/src/**/>*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)"
    ],
    moduleFileExtensions: [
        "js",
        "jsx"
    ],
    testPathIgnorePatterns: [
        "/node_modules/",
        "/public/"
    ],
    setupFiles: [
        "./__mocks__/styleMock.js",
        "./__mocks__/fileMock.js"
    ],
    setupFilesAfterEnv: [// setupFiles before the tests are ran, alternative to setupTests.js
        "@testing-library/jest-dom/extend-expect",
        //no need to import cleanup after each, done automatically when using Jest,
        "./setupTests.js"
    ],
    moduleNameMapper: {
        "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
        "\\.(css|scss|sass)$": "<rootDir>/__mocks__/styleMock.js"
    }
}