karma.conf.js

/**
 * Copyright 2017 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

module.exports = function (config) {
  const configuration = {
    basePath: "",
    frameworks: ["mocha", "chai", "detectBrowsers"],
    files: [
      {
        pattern: "tests/fixtures/*",
        included: false,
      },
      {
        pattern: "dist/**/*.@(mjs|js)",
        included: false,
      },
      {
        pattern: "tests/*.test.js",
        type: "module",
      },
    ],
    reporters: ["progress"],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    singleRun: true,
    concurrency: Infinity,
    detectBrowsers: {
      enabled: true,
      usePhantomJS: false,
      preferHeadless: true,
      postDetection: (availableBrowsers) => {
        if (process.env.INSIDE_DOCKER) {
          return ["DockerChrome"];
        } else if (process.env.CHROME_ONLY) {
          return ["ChromeHeadless"];
        } else {
          // Filtering SafariTechPreview because I am having
          // local issues and I have no idea how to fix them.
          // I know that’s not a good reason to disable tests,
          // but Safari TP is relatively unimportant.
          return availableBrowsers.filter(
            (browser) => browser !== "SafariTechPreview"
          );
        }
      },
    },
    customLaunchers: {
      DockerChrome: {
        base: "ChromeHeadless",
        flags: ["--no-sandbox"],
      },
    },
  };

  config.set(configuration);
};