Jest not finding any tests

Do you want to request a feature or report a bug?

Bug report.

What is the current behavior?

I’m converting one of my projects to TypeScript here: https://github.com/milesj/optimal Running yarn run jest will not find and run any tests, no matter what variation of testMatch and testRegex that Itry. That being said, it’s correctly finding my jest.config.js, as denoted when using --debug, as seen below.

{
  "configs": [
    {
      "automock": false,
      "browser": false,
      "cache": true,
      "cacheDirectory": "/var/folders/x1/q5gdh6d14h3fkxhgxx75k41h0000gn/T/jest_dx",
      "clearMocks": false,
      "coveragePathIgnorePatterns": [
        "/node_modules/",
        "/lib/",
        "/esm/"
      ],
      "detectLeaks": false,
      "forceCoverageMatch": [],
      "globals": {
        "__DEV__": true,
        "ts-jest": {
          "useBabelrc": true
        }
      },
      "haste": {
        "providesModuleNodeModules": []
      },
      "moduleDirectories": [
        "node_modules"
      ],
      "moduleFileExtensions": [
        ".ts",
        ".tsx",
        ".js",
        ".jsx",
        ".json"
      ],
      "moduleNameMapper": {},
      "modulePathIgnorePatterns": [],
      "name": "656565fb122fb27c21e0885f8d7856db",
      "resetMocks": false,
      "resetModules": false,
      "restoreMocks": false,
      "rootDir": "/Users/Miles/Sites/optimal",
      "roots": [
        "/Users/Miles/Sites/optimal/src",
        "/Users/Miles/Sites/optimal/tests"
      ],
      "runner": "jest-runner",
      "setupFiles": [
        "/Users/Miles/Sites/optimal/node_modules/regenerator-runtime/runtime.js"
      ],
      "setupTestFrameworkScriptFile": null,
      "snapshotSerializers": [],
      "testEnvironment": "jest-environment-jsdom",
      "testEnvironmentOptions": {},
      "testLocationInResults": false,
      "testMatch": [],
      "testPathIgnorePatterns": [
        "/node_modules/"
      ],
      "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
      "testRunner": "/Users/Miles/Sites/optimal/node_modules/jest-jasmine2/build/index.js",
      "testURL": "about:blank",
      "timers": "real",
      "transform": [
        [
          "^.+\\.jsx?$",
          "/Users/Miles/Sites/optimal/node_modules/babel-jest/build/index.js"
        ],
        [
          "^.+\\.tsx?$",
          "/Users/Miles/Sites/optimal/node_modules/ts-jest/index.js"
        ]
      ],
      "transformIgnorePatterns": [
        "/node_modules/"
      ],
      "watchPathIgnorePatterns": []
    }
  ],
  "globalConfig": {
    "bail": false,
    "changedFilesWithAncestor": false,
    "coverageDirectory": "/Users/Miles/Sites/optimal/coverage",
    "coverageReporters": [
      "lcov"
    ],
    "detectLeaks": false,
    "expand": false,
    "globalSetup": null,
    "globalTeardown": null,
    "listTests": false,
    "logHeapUsage": true,
    "maxWorkers": 7,
    "noStackTrace": false,
    "nonFlagArgs": [],
    "notify": false,
    "notifyMode": "always",
    "passWithNoTests": false,
    "rootDir": "/Users/Miles/Sites/optimal",
    "runTestsByPath": false,
    "testFailureExitCode": 1,
    "testPathPattern": "",
    "testResultsProcessor": null,
    "updateSnapshot": "new",
    "useStderr": false,
    "verbose": false,
    "watch": false,
    "watchman": true
  },
  "version": "22.4.2"
}
No tests found
No files found in /Users/Miles/Sites/optimal.
Make sure Jest's configuration does not exclude this directory.
To set up Jest, make sure a package.json file exists.
Jest Documentation: facebook.github.io/jest/docs/configuration.html
Pattern:  - 0 matches

What is the expected behavior?

It finds and runs my tests.

Please provide your exact Jest configuration

My Jest configuration is automatically built with Beemo, but looks like the following.

module.exports = {
  "coverageDirectory": "./coverage",
  "coveragePathIgnorePatterns": [
    "/node_modules/",
    "/lib/",
    "/esm/"
  ],
  "coverageReporters": [
    "lcov"
  ],
  "globals": {
    "__DEV__": true,
    "ts-jest": {
      "useBabelrc": true
    }
  },
  "moduleFileExtensions": [
    ".ts",
    ".tsx",
    ".js",
    ".jsx",
    ".json"
  ],
  "rootDir": "/Users/Miles/Sites/optimal",
  "roots": [
    "./src",
    "./tests"
  ],
  "setupFiles": [],
  "setupTestFrameworkScriptFile": null,
  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
  "transform": {
    "^.+\\.jsx?$": "babel-jest",
    "^.+\\.tsx?$": "ts-jest"
  },
  "verbose": false
};

Run npx envinfo --preset jest in your project directory and paste the results here

System: OS: macOS High Sierra 10.13.3 CPU: x64 Intel® Core™ i7-4870HQ CPU @ 2.50GHz Binaries: Node: 9.8.0 Yarn: 1.5.1 npm: 5.1.0

[milesj]

Turns out the problem was that my moduleFileExtensions had a preceeding period. Perhaps Jest should check for that.

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