Jest incorrectly exits 0 when no tests are found

[LINKIWI]

This behavior is reproducible on jest@21.1.0.

Actual behavior

When attempting to run tests against a directory that is nonexistent (or even a directory that exists, but does not contain any valid tests), the CLI exits 0.

Expected behavior

The CLI should exit nonzero when there is an error identifying tests.

Motivation

This is problematic for CI/automated environments where test success is determined based on exit code. Semantically, it is a valid error condition if CI isn't able to find any tests to run. This surfaced after performing a major refactor that changed a project's test directory structure, and CI still passed the build despite the jest step failing to identify any tests.

Minimally reproducible example

$ yarn add jest
$ mkdir test
$ ./node_modules/.bin/jest --verbose test
No tests found
In /path/to/test
  6 files checked.
  testMatch: **/__tests__/**/*.js?(x),**/?(*.)(spec|test).js?(x) - 0 matches
  testPathIgnorePatterns: /node_modules/ - 6 matches
Pattern: test - 0 matches
$ echo $?
0

[SimenB]

Can you send a PR with a fix?

[SimenB]

Actually, this was fixed in #3672

Please install jest@test to use it. A stable release is coming early next week

[github-actions]

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