Coverage seems to be incorrect

[RobbieTheWagner]

I am using karma-coverage and I am getting like 98%+ coverage on all of my files and I know my tests don't exercise that much of the code. Any idea why the coverage is falsely high?

It's like it's only reporting for what the tests run for and not the remainder of the JS in each file.

[samidarko]

I'm using this
https://github.com/ColCh/isparta-instrumenter-loader

I got the same problem, some of my components (it's a react app) are 100% covered but are not even used in the tests?

// Karma configuration
// Generated on Sun Sep 13 2015 12:16:34 GMT+0800 (SGT)
var webpack = require("webpack"),
    path = require("path");

module.exports = function (config) {
    config.set({

        // base path that will be used to resolve all patterns (eg. files, exclude)
        basePath: '',


        // frameworks to use
        // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
        frameworks: ['jasmine'],


        // list of files / patterns to load in the browser
        files: [
            './node_modules/phantomjs-polyfill/bind-polyfill.js',
            './test/**/*.js'
        ],


        // list of files to exclude
        exclude: [],


        // preprocess matching files before serving them to the browser
        // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
        preprocessors: {
            "./test/**/*.js": ["webpack"]
        },

        webpack: {
            module: {
                preLoaders: [
                    {
                        test: /\.js?$/,

                        exclude: /(test|node_modules)/,
                        loader: 'isparta-instrumenter-loader'
                    }
                ],
                loaders: [
                    {
                        test: /\.js?$/,
                        exclude: /(node_modules)/,
                        loader: 'babel'
                    },
                    {
                        test: /\.scss$/,
                        loader: 'style!css!sass'
                    },
                    {
                        test: /\.(eot|woff|woff2|ttf|svg|png|jpg)$/,
                        loader: 'url-loader?limit=30000&name=[name]-[hash].[ext]'
                    },
                ]
            },
            plugins: [],
            resolve: {}
        },
        webpackMiddleware: {
            noInfo: true
        },
        plugins: [
            require("karma-webpack"),
            require("karma-jasmine"),
            require("karma-junit-reporter"),
            require("karma-coverage"),
            require("karma-phantomjs-launcher")
        ],

        // test results reporter to use
        // possible values: 'dots', 'progress'
        // available reporters: https://npmjs.org/browse/keyword/karma-reporter
        reporters: ['progress', 'junit', 'coverage'],

        coverageReporter: {
            type: 'cobertura',
            dir: 'reports',
            subdir: './'
        },

        junitReporter: {
            outputDir: 'reports', // results will be saved as $outputDir/$browserName.xml
            outputFile: '', // if included, results will be saved as $outputDir/$browserName/$outputFile
            suite: '' // suite will become the package name attribute in xml testsuite element
        },

        // 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_INFO,


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


        // start these browsers
        // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
        browsers: ['PhantomJS'],


        // Continuous Integration mode
        // if true, Karma captures browsers, runs the tests and exits
        singleRun: true
    })
};

[douglasduteil]

I'm closing this for now. Feel free to reopen it if you still have this issue.

[philjestin]

I also have the same problem with a similar setup, components that have no unit tests yet being reported as 100% coverage

[jednano]

Are you guys looking for the --include-all-sources flag?

--include-all-sources
        instrument all unused sources after running tests, defaults to false

[carneiror]

I still have this issue (browserify-istanbul 0.2.1 and istanbul 0.3.22). @jedmao how can I use that option with browserify-istanbul?

[jednano]

@carneiror I've never used browserify-istanbul, so I couldn't tell you, but I would just refer you to their documentation. However you can provide istanbul options.

[samidarko]

I fixed my problem and now isparta is working perfectly fine. Basically, in my webpack config, I was using the "exclude" keyword to select the files to "pack" then I replaced by "include" instead.

include: [path.resolve(__dirname, 'src')],