karma.conf.js

"use strict";
const os = require("os");

if (os.arch() === "arm64") {

    // For arm64 architecture, install chromium-browser using "apt-get install chromium-browser"
    process.env.CHROME_BIN = "/usr/bin/chromium-browser";
} else {
    process.env.CHROME_BIN = require("puppeteer").executablePath();
}

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: ["mocha"],


        // list of files / patterns to load in the browser
        files: [
            "build/eslint.js",
            "tests/lib/linter/linter.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: {
            "tests/lib/linter/linter.js": ["webpack"]
        },
        webpack: {
            mode: "none",
            stats: "errors-only"
        },
        webpackMiddleware: {
            logLevel: "error"
        },


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

        mochaReporter: {
            output: "minimal"
        },

        // 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: false,


        /*
         * start these browsers
         * available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
         */
        browsers: ["HeadlessChrome"],
        customLaunchers: {
            HeadlessChrome: {
                base: "ChromeHeadless",
                flags: ["--no-sandbox"]
            }
        },

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

        /*
         * Concurrency level
         * how many browser should be started simultaneous
         */
        concurrency: Infinity
    });
};