I am trying to get Istanbul to work.
I keep getting this message at the end of running istanbul:
No coverage information was collected, exit without writing coverage
information
I have tried everything I could find online as you can see:
"scripts": {
"start": "node ./bin/start.js",
"test": "mocha test --no-timeouts",
"debug_mocha": "node-debug --no-timeouts _mocha",
"eslint": "eslint .",
"jshint": "jshint --exclude ./node_modules .",
"istanbul": "istanbul cover --include-all-sources --hook-run-in-context node_modules/.bin/_mocha -- -u exports -R spec test/**/*",
"istanbul2":"istanbul cover node_modules/.bin/_mocha -- -u exports -R spec test/**/*",
"istanbul1":"istanbul cover node_modules/.bin/_mocha -- test/**/*",
"istanbul0":"istanbul cover _mocha test/**/*.js",
"istanbul3":"istanbul cover _mocha -- -R spec --recursive test"
}
my .istanbul.yml file is at the root of the project and looks like istanbul is picking it up successfully.
//.istanbul.yml
instrumentation:
compact: false
save-baseline: true
reporting:
reports:
- lcov
- cobertura
What am I missing?
Got it, finally.
https://github.com/gotwarlost/istanbul/issues/44#issuecomment-57708358 says:
Using _mocha directly does not work on windows. Please use the full path to the JS file instead
Then, after a little experimentation, victory:
istanbul cover C:/dev/my_project/node_modules/mocha/bin/_mocha --
Try this, may works for you. Script tag in your package.json
"cover" : "NODE_ENV=test babel-node ./node_modules/babel-istanbul/lib/cli cover --dir ./coverage _mocha -- -R spec --ui bdd ./test/setup.js ./test --recursive"
setup.js will be your setup javascript
./test will be the folder where all your tests sits.
packages need to install:
- babel-istanbul
- babel-node
- mocha
This works for me :) (npm run cover)
Note:
if on windows: remove NODE_ENV=test, and may need to make the _mocha full path to your node module folder
If you're setting up a new project and trying to get istanbul to work, ensure that you have a least one test file that references at least one of the project files for istanbul to reference for its coverage report.
"istanbul": "0.4.4",
"mocha": "3.0.0"
In my case, I was setting up a new project and getting the first index.js
and test/index.spec.js
files prepped. When I tried to run:
"test": "istanbul cover --report html node_modules/mocha/bin/_mocha -- test/**/*.js --ui bdd -R spec"
I got an output from mocha of all unit tests passing (which there were no tests written yet so all 0 of them passed) but I then received this error after that:
No coverage information was collected, exit without writing coverage information
The issue turned out to be that I had not yet added a require
for the index.js
file in the test/index.spec.js
file yet. Istanbul had no files to reference from the test files to check for coverage information.
If it's a pathing issue to _mocha referenced in the npm script, there will be an additional "SyntaxError:" message that follows the "No coverage information was collected" message.