jest.config.js

// This config has been initially copied from:
// https://www.gatsbyjs.com/docs/how-to/testing/unit-testing/
module.exports = {
  testMatch: [
    "**/__tests__/**/*.[jt]s?(x)",
    "**/?(*.)+(spec|test).[jt]s?(x)",
    // This is just the default `testMatch` with the only difference, that utils
    // inside __tests__ folders are not executed as tests:
    "!**/__tests__/utils/**/*",
  ],
  transform: {
    "^.+\\.[jt]sx?$": "<rootDir>/jest-preprocess.js",
  },
  moduleNameMapper: {
    ".+\\.(css|styl|less|sass|scss)$": `identity-obj-proxy`,
    ".+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": `<rootDir>/__mocks__/file-mock.js`,
  },
  testPathIgnorePatterns: [`node_modules`, `\\.cache`, `<rootDir>.*/public`],
  transformIgnorePatterns: [`node_modules/(?!(gatsby)/)`],
  globals: {
    __PATH_PREFIX__: ``,
  },
  setupFiles: [`<rootDir>/loadershim.js`],
};