jest-config.json

{
  "testPathDirs": ["app"],

  "setupTestFrameworkScriptFile": "jest-setup.js",

  "moduleNameMapper": {
    "underscore": "lodash",

    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|swf|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
    "\\.(css|less)$": "<rootDir>/__mocks__/styleMock.js"
  }
}