No coverage nyc mocha

Question

I am just unable to figure out why test coverage is 0 even though test case is passing. I have a script in package.json:

"nyctest": "node --max_old_space_size=4096 node_modules/nyc/bin/nyc.js --reporter=text mocha"

When I run npm run nyctest

My test pass, but coverage is 0 percent.

Following is the test and the file is it testing:

test.js

var chai = require('chai');
var sinon = require('sinon');
var sinonChai = require('sinon-chai');
chai.should();
chai.use(sinonChai);
var application = require('../../../src/main/resources/static/js/components/app.js');

describe('sample return testing', function(){
    it('should return true', function(){
        application.sample.returnValue().should.equal(true);
    })
});

app.js

const sample = {
    returnValue: function () {
        return true;
    }
};

module.exports = {sample};

Appreciate any help.

Answer 1

By August 2020: two things:

1. You need to add the --all parameter.
2. Preferably use the .nycrc file in order to not have a long command line in your package.json as follows:

The minimal .nycrc file:

{
  "all": true,
  "include": [
    "test/**.js"
  ],
  "exclude": []
}

Answer 2

You need to modify your nyctest command with --all flag, as follows:

"nyctest": "nyc --reporter=lcov --reporter=text-lcov --all -x \"./node_modules/*\" -x \"./coverage/*\" check-coverage --lines 10 --functions 90 npm run unittest"

So with --all flag, all files are fetched 😄