Setting "coverageReporters" : ["json"] causes code coverage to not run

[n8ores]

🐛 Bug Report

Setting "coverageReporters" : ["json"] in the package.json file causes the code coverage to partially run.

1. No code coverage output will be generated in the console.
2. The coverage directory is created successfully with the coverage_report.json inside it, however, this report contains a blank object {}.

To Reproduce

Setup any vanilla nodejs installation with the below JEST configuration in your packages.json file.

"jest": { "collectCoverage": true, "coverageDirectory": "../coverage", "testPathIgnorePatterns": [ "/node_modules/" ], "coverageReporters" : ["json"], "verbose": true, "coverageThreshold": { "global": { "branches": 50, "functions": 50, "lines": 50, "statements": 50 } } },

Expected behavior

The coverage report file should contain the code coverage values and the code coverage results should still be outputted to the console as occurs when "coverageReporters" is omitted.

[kirintwn]

According to the official docs:

Add "text" or "text-summary" to see a coverage summary in the console output.

e.g. coverageReporters: ['json', 'text'],

As for the blank output in json file, the problem might be no test matching the pattern with testMatch default pattern.

[tiendq]

If no test matched then coverage is empty (contains {}), no matter I set coverageReporters or not.

[ThePeach]

at all related to #9319 ?

[JamesXiaoFF]

How to translate : coverageReporters: ['json', { file: 'xxx.json' }]
in package.json scripts

[github-actions]

This issue is stale because it has been open for 1 year with no activity. Remove stale label or comment or this will be closed in 30 days.

[github-actions]

This issue was closed because it has been stalled for 30 days with no activity. Please open a new issue if the issue is still relevant, linking to this one.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.