An MVCE for an issue with weird jest path matching behaviour.
- Clone this repository
- Open the repository in VS Code
- When prompted "Folder contains a Dev Container configuration file. Reopen folder to develop in a container." click "Reopen in Container" (or press
Ctrl+Shift+Pand select "Dev Containers: Reopen in Container") - Open the integrated terminal and follow along with the following commands:
> pwd
/workspaces/jest-mvce
> npx jest --testMatch 'src/tests/hello-world.test.js'
No tests found, exiting with code 1
Run with `--passWithNoTests` to exit with code 0
In /workspaces/jest-mvce
4 files checked.
testMatch: src/tests/hello-world.test.js - 0 matches
testPathIgnorePatterns: /node_modules/ - 4 matches
testRegex: - 0 matches
Pattern: - 0 matches
> npx jest --testMatch './src/tests/hello-world.test.js'
No tests found, exiting with code 1
Run with `--passWithNoTests` to exit with code 0
In /workspaces/jest-mvce
4 files checked.
testMatch: ./src/tests/hello-world.test.js - 0 matches
testPathIgnorePatterns: /node_modules/ - 4 matches
testRegex: - 0 matches
Pattern: - 0 matches
> npx jest --testMatch '/workspaces/jest-mvce/src/tests/hello-world.test.js'
PASS src/tests/hello-world.test.js
✓ adds 1 + 2 to equal 3 (1 ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 0.197 s
Ran all test suites.
> npx jest --testMatch 'src/**/*.test.js'
No tests found, exiting with code 1
Run with `--passWithNoTests` to exit with code 0
In /workspaces/jest-mvce
4 files checked.
testMatch: src/**/*.test.js - 0 matches
testPathIgnorePatterns: /node_modules/ - 4 matches
testRegex: - 0 matches
Pattern: - 0 matches
> npx jest --testMatch '/workspaces/jest-mvce/src/**/*.test.js'
PASS src/tests/hello-world.test.js
✓ adds 1 + 2 to equal 3 (1 ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 0.186 s, estimated 1 s
Ran all test suites.
> npx jest --testMatch '**/*.test.js' --rootDir 'src'
PASS src/tests/hello-world.test.js
✓ adds 1 + 2 to equal 3 (1 ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 0.189 s
Ran all test suites.Jest's pattern matching behaviour is a bit wild, but it works if you make sure to use --rootDir and glob at the start of --testMatch.
Is it because the default rootDir is / if it isn't set from package.json? That doesn't seem to be documented here, but it bears investigating.