karma plugin issue

What karma packages do you use? Please attach your karma.config.json

'use strict';

let path = require('path'),
    webpackConfig = require('./webpack.config'),
    targetBrowsers = [],
    isProd = process.env.NODE_ENV === 'production',
    plugins = [
        'karma-webpack',
        'karma-jasmine',
        'karma-htmlfile-reporter',
        'karma-coverage',
        'karma-spec-reporter',
        'karma-source-map-support',
        'karma-sourcemap-loader'
    ],
    hasCoverage = global.process.argv.reduce((result, arg) => arg.indexOf('coverage') !== -1 || result, false),
    include = [path.resolve('./app')],
    webpack_module = {
        preLoaders: hasCoverage && isProd ? [
            // Load src files through isparta for transpiling + instrumentation; exclude .spec and .conf files + modules
            {
                test: /\.js$/,
                loader: 'isparta',
                include: /app/,
                exclude: [/\.(?:spec|conf)\.js$/, /node_modules/, /app/]
            },
            // Load .spec and .conf files through babel for transpiling
            {
                loader: 'babel',
                test: /\.(?:spec|conf)\.js$/,
                include: /app|test/
            }
        ] : [],
        loaders: webpackConfig.module.loaders
    };

if (isProd) {
    targetBrowsers.push('PhantomJS');
    plugins.push('karma-phantomjs-launcher')
}
else {
    targetBrowsers.push('Chrome');
    plugins.push('karma-chrome-launcher');
}

if (hasCoverage)
    webpack_module.postLoaders = [{
        test: /\.js$/,
        include: include,
        loader: 'istanbul-instrumenter'
    }];

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

        // testing framework to use (jasmine/mocha/qunit/...)
        frameworks: ['jasmine', 'source-map-support'],

        // list of files / patterns to load in the browser
        files: ['spec.js'],
        webpack: {
            devtool: 'inline-source-map',
            module: webpack_module,
            cache: true
        },
        webpackMiddleware: {
            stats: {
                chunkModules: false,
                colors: true
            }
        },

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

        //
        // For unit tests to run successfully, you must be on the finra.org domain
        //
        // Edit this file as Admin: C:\Windows\System32\drivers\etc\hosts (On Windows)
        // Add this entry to the end:
        //   127.0.0.1                     localhost       local.finra.org
        // Access your web server this way:
        //   http://local.finra.org
        //
        hostname: 'localhost',
        port: 9018,
        runnerPort: 9100,
        colors: true,
        // level of logging
        // possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
        logLevel: config.ERROR,

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

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

        // it is kinda slow with Jenkins
        browserNoActivityTimeout: 100000,
        browsers: targetBrowsers,

        coverageReporter: {
            dir: 'coverage/',
            subdir: '.',
            reporters: [
                {type: 'text', file: 'text.txt'},
                {type: 'text-summary', file: 'text-summary.txt'},
                {type: 'lcov'},
                {type: 'clover'}
            ]
        },

        plugins: plugins,

        reporters: ['progress', 'html', 'spec', 'coverage'],

        htmlReporter: {
            outputFile: 'test/unit.html'
        },

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

I see. The problem is that the actual spec files you are editing are not loaded by karma - it loads the generated bundle instead. Please see https://youtrack.jetbrains.com/issue/WEB-21308#comment=27-1411115