Error when do jest --watch in project with no git or hg

[artiebits]

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

bug

What is the current behavior?

I created an app using create-react-native-app and ran yarn test that uses jest --watch. And It threw the error:

Determining test suites to run...Error: This promise must be present when running with -o.
    at /Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/search_source.js:202:17
    at Generator.next (<anonymous>)
    at step (/Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/search_source.js:19:362)
    at /Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/search_source.js:19:592
    at new Promise (<anonymous>)
    at /Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/search_source.js:19:273
    at SearchSource.getTestPaths (/Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/search_source.js:216:10)
    at /Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/run_jest.js:44:29
    at Generator.next (<anonymous>)
    at step (/Users/arthurkhusaenov/Codes/AwesomeProject/node_modules/jest-cli/build/run_jest.js:23:380)

If the current behavior is a bug, please provide the steps to reproduce and
either a repl.it demo through https://repl.it/languages/jest or a minimal
repository on GitHub that we can yarn install and yarn test.

rm –rf .git in some project that uses Jest. Then jest --watch

What is the expected behavior?

I saw docs https://facebook.github.io/jest/docs/en/cli.html#running-from-the-command-line and found jest --watch runs jest -o by default. So I tried jest -o and I’ve got the clear message:

Jest can only find uncommitted changed files in a git or hg repository. If you make your project a git or hg repository (`git init` or `hg init`), Jest will be able to only run tests related to files changed since the last commit.
No tests found related to files changed since last commit. 

If jest --watch runs jest -o by default then should jest --watch shows the same message in this case?

It happens here https://github.com/facebook/jest/blob/master/packages/jest-cli/src/run_jest.js#L45

if (!data.tests.length && globalConfig.onlyChanged && data.noSCM) {
  if (globalConfig.watch) {
    data = await source.getTestPaths(globalConfig);
  } else {
    new Console(outputStream, outputStream).log(
      'Jest can only find uncommitted changed files in a git or hg ' +
        'repository. If you make your project a git or hg ' +
        'repository (`git init` or `hg init`), Jest will be able ' +
        'to only run tests related to files changed since the last ' +
        'commit.',
    );
  }
}

In first if statement it's true && true && true and here if (globalConfig.watch) it’s also true because I use --watch. So I think it should be:

if (!data.tests.length && globalConfig.onlyChanged && data.noSCM) {
  new Console(outputStream, outputStream).log(
    'Jest can only find uncommitted changed files in a git or hg ' +
      'repository. If you make your project a git or hg ' +
      'repository (`git init` or `hg init`), Jest will be able ' +
      'to only run tests related to files changed since the last ' +
      'commit.',
  );
}

But what do you think guys, can I change that or I missed something?

[thymikee]

IMO we should remove this branch, as we don't support --watch inside non-version-controlled environments. Feel free to send a PR fixing that :)

[thymikee]

Closed via #5060

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