No code coverage

[MathRobin]

Hi, I have a problem with code coverage. This the tests results :

[...]
24 tests passed (24 total in 9 test suites, run time 2.353s)
----------|----------|----------|----------|----------|----------------|
File      |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
----------|----------|----------|----------|----------|----------------|
----------|----------|----------|----------|----------|----------------|
All files |      100 |      100 |      100 |      100 |                |
----------|----------|----------|----------|----------|----------------|

All reports generated

Process finished with exit code 0

All my tests succeed (count 73 expect). But no cover. I'm just testing normal node code. I use babel-jest, here you have the config in package.json :

"scripts": {
  "test": "jest"
},
"jest": {
  "collectCoverage": true,
  "moduleFileExtensions": [
    "js",
    "json"
  ],
  "scriptPreprocessor": "<rootDir>/node_modules/babel-jest",
  "testDirectoryName": "unit",
  "testFileExtensions": [
    "js"
  ],
  "testPathDirs": [
    "<rootDir>/tests/"
  ]
}

Here is my project architecture :

./
|-- app
|   |-- routes
|   |   |-- private
|   |   |-- public
|-- tests
|   |-- unit
|   |   |-- routes
|   |   |   |-- private
|   |   |   |-- public

The tests/unit folder contains the same architecture as app folder as you can see.

Have you an idea about why I don't have any reports ? Thanks in advance !

[cpojer]

Hey! Which version of node, npm and jest are you using?

[MathRobin]

Last jest, last node 5.x and last npm 3.x

[cpojer]

This is not great. Can you try running jest with --coverage and tell me if it yields something different? Can you maybe create a reduced example that I can dig into to figure out what is wrong?

[MathRobin]

Yes, tried the same doesn't get more. I will make you an example yes

[quantizor]

Add collectCoverageOnlyFrom with specific file names and it will work.

"collectCoverageOnlyFrom": {
        "index.js": true,
        "MyFolder/index.js": true
}

etc

[cyjia]

I found following lines in file jest-cli/src/HasteModuleLoader/HasteModuleLoader.js.

const onlyCollectFrom = this._config.collectCoverageOnlyFrom;
const shouldCollectCoverage =
      this._config.collectCoverage === true && !onlyCollectFrom
      || (onlyCollectFrom && onlyCollectFrom[modulePath] === true);

collectCoverageOnlyFrom is filled with {} by default, so shouldCollectCoverage will always be false unless you provide one with files.
I think the intention is to gather all coverage by default, this should be a bug.

[MathRobin]

I confirm that when I list every file by hand, it's working.

I've tried with a small extract of the project, but here I get the coverage without listing. I bet it was because of paths but after a day passed on it with a colleague, not found where is the difference...

[aospan]

same problem described here #433

as workaround you can create fake tests/package.json with {} inside. In this case node-haste create correct requiredModules and you will see coverage for all files (direct dependent from test file).

[mattlo]

Also running into this issue. Listing the direct paths under collectCoverageOnlyFrom works but its not practical.

[jasonmerino]

I'm also running into this issue. Getting 100% across the board when I actually only have partial tests on a single file.

[cpojer]

Fixed by 0.9.0.

[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.