React Testing Tutorial - 14 - Code Coverage

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Code Coverage
React Testing Tutorial
React Testing with Jest and React Testing Library

[krishnanigalye]

To make it work with npm, use the following code.

"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject",
"coverage": "npm test -- --coverage"
},

[toannew]

1:00
1:40
3:53 filter files to be tested
5:50 ignore files when testing
7:00 set up threshold
8:25 Bracnh coverage = if/else conditions in code
10:30 summary

[vanshajkapoor]

For npm users use this : {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject",
"coverage": "npm test -- --coverage --watchAll"
}

[sairamgudiputi]

To generate coverage report:

"coverage": npm test -- --coverage --watchAll

note: extra double dashes after test.

[steinburg]

I am using npm and this is how I got it to work

1) added "coverage": "react-scripts test --coverage --watchAll" to the scripts section
2) npm run coverage

I am using node version 18.16.1

[ronaldolipata]

If you use npm and this doesn't work for you
"coverage" : "npm test -- -- coverage"

Try this instead, it worked for me.
"coverage": "react-scripts test --coverage"

Then run
npm coverage or npm run coverage

[parthadhikari]

For npm users:

"coverage": "react-scripts test --coverage --watchAll --collectCoverageFrom='src/components/**/*.{ts, tsx}' --collectCoverageFrom='!src/components/**/*.{types, stories, constants, test, spec}.{ts, tsx}'"

[alweenaiqbal]

use following scripts if you don't see the uncovered files-
"test": "react-scripts test -u --watchAll",
"coverage": "npm test -- --coverage"
and then run the command - npm run coverage

[code_with_sheynet]

You the best, sir

You tutorial video is My back bone, I just love you! Only your tutorial i understand...

[piyushaggarwal]

This is the final script I had using NPM

"coverage": "react-scripts test --coverage --watchAll --collectCoverageFrom='src/components/**/*.{ts, tsx}' --collectCoverageFrom='!src/components/**/*.{types, stories, constants, test, spec}.{ts, tsx}'"

[botchu]

For NPM users:

"coverage": "npm test -- --coverage --watchAll"

Note: use the extra double dash -- after test to work

[rickyreyes]

Thank you! This was very helpful. Saved me a ton of time and exactly what I was looking for.

[otherme]

For People Running into issues for getting the test coverage in case of npm
Run the Following Command


This worked For me !! Thanks !!!

[saisashankchavaly]

Testing tutorials are very good and very informative .

[LekkyDev]

Please make a short video about how to use Vitest to test a component
that uses react-router(data mode) loader with Suspense+Await logic.
I've been really struggling with that. Thanks.

[imhimmazi]

Using npm, i added the following to the script:
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject",
"coverage": "react-scripts test --coverage --watchAll"
},
Windows OS, Node v20.12.2

[ParthKamal-rrnr]

How can i use to get the code coverage of my selenium tests in the react app? can you give me any solution for that ?

[clnia_dev]

What does "statements": -10 mean? Does it mean it will fail if there are no statements executed?

[achalagawai]

Can you tell me why the test cases are passing but coverage is not increasing.😢😢😢

[_suryak]

hi, i got error like could not find react-redux context value; please ensure the component is wrapped in a <Provider>
but i also wrapped by provider within store and i change old to latest version please gave me a any solution