Jest: Can't get the coverage with Jest 24

[ionutcirja]

🐛 Bug Report

I can't get the coverage anymore with Jest 24.

To Reproduce

Steps to reproduce the behavior:

This is my jest configuration:
{
"verbose": true,
"clearMocks": true,
"restoreMocks": true,
"setupFilesAfterEnv": [
"/config/enzyme-setup.js"
],
"collectCoverage": true,
"collectCoverageFrom": [
"/.{js}",
"!/node_modules/",
"!index.js",
"!config/",
"!coverage/",
"!webpack.dev.config.js",
"!client/index.js",
"!client/store/",
"!client/reducers/",
"!client/sagas/",
"!client/style/"
],
"testMatch": [
"/__tests__/?(.)(spec|test).js"
],
"moduleNameMapper": {
"\.(scss)$": "/config/module-mock.js"
},
"snapshotSerializers": [
"enzyme-to-json/serializer"
]
}

Expected behavior

I suppose it should still work as per documentation.

[thymikee]

testMatch is likely invalid. Can you use default one and check again? (just delete it from config)

[ionutcirja]

Ahh, I don't know why, but copy/paste didn't work.

"testMatch": [
"*/__tests__/?(.)(spec|test).js"
],

This is how it is. And it's valid, because my tests are passing, but the coverage is not there.

PS I removed it just for test, same result.

[SimenB]

"**/*.{js}", looks iffy to me (try just "**/*.js").

Anyways, please put together a reproduction like the template asked you to. Just config isn't enough

[ionutcirja]

Pff, thanks man. This syntax worked in v23.

[SimenB]

Yes, it's still an invalid glob. This is mentioned at the top of the list of breaking changes in the blog post: https://jestjs.io/blog/2019/01/25/jest-24-refreshing-polished-typescript-friendly#breaking-changes

Great you got it working, though!

[ionutcirja]

Thanks for you help, Simen!

[k-funk]

Can also change to '**/*.{js,}' if you want to keep the same curly-brace syntax, but only one file extension.

[maneetgoyal]

This comment worked: https://github.com/facebook/jest/issues/7865#issuecomment-462389513 👍 Thanks

[JimLynchCodes]

@maneetgoyal The comment did not work for me, sadly. I have created another issue for this problem here.

[maneetgoyal]

@JimTheMan In my case, I was also missing the moduleFileExtensions property and was using .ts files instead.

So, the Jest (v. 24.9.0) config eventually had these properties:

  // An array of file extensions your modules use
  moduleFileExtensions: ["ts", "js"],
  // Needed to collect coverage data
  collectCoverage: true,
  // Needed to specify from where to collect the coverage data
  collectCoverageFrom: ["./src/**/*.ts"],
  // "text" reporter logs the coverage report in the console
  coverageReporters: ["text", "html"],
  // Stores coverage report in this directory
  coverageDirectory: "./coverage"

Hope it helps a bit.