Coverage reporter is asking for lcov.info file if coverage is absent in karma.conf.js reporters

[sprilukin]

I'm using Intellij Idea + karma plugin to run karma tests.
Namely, I want to run test coverage.

The issue is that when I run a test with coverage Idea asking me for lcov.info:

my karma.conf.js is the following:

module.exports = function(config) {
    return {
        // base path, that will be used to resolve files and exclude
        //        basePath: '',


        // frameworks to use
        frameworks: ['jasmine', 'requirejs'],


        // list of files / patterns to load in the browser
        files: [
            //require.config file
            {pattern: 'src/require.config.js'},

            // tests env libraries
            {pattern: 'src/bower_components/jquery/dist/jquery.js'},
            {pattern: 'src/bower_components/jquery-simulate/jquery.simulate.js'},
            {pattern: 'src/bower_components/jasmine-jquery/lib/jasmine-jquery.js'},
            {pattern: 'src/bower_components/sinonjs/sinon.js'},
            {pattern: 'src/bower_components/sinon-ie/sinon-ie.js'},
            {pattern: 'src/bower_components/jasmine-sinon/lib/jasmine-sinon.js'},

            //source files
            {pattern: 'src/**/*.js', included: false},
            {pattern: 'src/**/*.htm', included: false},
            {pattern: 'src/**/*.json', included: false},


            //all related tests files
            {pattern: 'test/tools/testEnvironment.css'},
            {pattern: 'test/tools/custom.matchers.js'},
            {pattern: 'test/tools/jasmine.ext.js'},
            {pattern: 'test/tools/jquery.cookies.js'},
            {pattern: 'test/mock/**/*.js', included: false},

            //tests loader
            'test/test/test-main.js'
        ],


        // list of files to exclude
        exclude: [

        ],


        // test results reporter to use
        // possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
        reporters: ['spec', 'junit'],

        preprocessors: {
            // source files, that you wanna generate coverage for
            // do not include tests or libraries
            // (these files will be instrumented by Istanbul)
            'src/!(bower_components)/**/*.js': ['coverage']

        },

        junitReporter: {
            outputFile: 'test/karma-reports/test-results.xml'
        },

        coverageReporter: {
            includeAllSources: true,
            reporters: [
                {
                    type : 'html',
                    dir : 'test/karma-coverage/coverage/html'
                },
                {
                    type : 'cobertura',
                    dir:   'test/karma-coverage/coverage'
                }
            ]
        },

        // web server port
        port: 9876,


        // enable / disable colors in the output (reporters and logs)
        colors: true,


        // level of logging
        // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
        logLevel: config.LOG_ERROR,


        // enable / disable watching file and executing tests whenever any file changes
        autoWatch: false,


        // Start these browsers, currently available:
        // - Chrome
        // - ChromeCanary
        // - Firefox
        // - Opera (has to be installed with `npm install karma-opera-launcher`)
        // - Safari (only Mac; has to be installed with `npm install karma-safari-launcher`)
        // - PhantomJS
        // - IE (only Windows; has to be installed with `npm install karma-ie-launcher`)
        browsers: ["PhantomJS"],

        // If browser does not capture in given timeout [ms], kill it
        captureTimeout: 60000,
        browserNoActivityTimeout: 1000000,


        // Continuous Integration mode
        // if true, it capture browsers, run tests and exit
        //singleRun: true,

        plugins: [
            "karma-jasmine",
            "karma-phantomjs-launcher",
            "karma-chrome-launcher",
            "karma-coverage",
            "karma-junit-reporter",
            "karma-spec-reporter",
            "karma-jasmine-html-reporter",
            "karma-requirejs"
        ]
    };
};

if I'm adding coverage reporter manually it becomes working ok:

        reporters: ['spec', 'junit', 'coverage'],

        coverageReporter: {
            includeAllSources: true,
            reporters: [
                {
                    type : 'html',
                    dir : 'test/karma-coverage/coverage/html'
                },
                {
                    type : 'cobertura',
                    dir:   'test/karma-coverage/coverage'
                },
                {
                    type: 'lcov',
                    dir:   'test/karma-coverage/coverage/lcov'
                }
            ]
        }

however i do not want to have 'coverage' in my reporters by default - it slows down tests.

The solution is to add coverage reporter in intellijCoverageReporter.js, see my pull request

[chorsnell]

Using karma-coverage-istanbul-reporter instead of just karma-coverage I'm not sure the PR works

[segrey]

Let's continue discussion in the https://youtrack.jetbrains.com/issue/WEB-32836.

[dimaqw]

Using karma-coverage-istanbul-reporter instead of just karma-coverage I'm not sure the PR works

How to properly config karma with karma-coverage-istanbul-reporter?