Method loadMocha

packages/dev/src/test-host.js:77–113

* @param {import('puppeteer').Page} page * @param {string} pathnamePrefix

(page, pathnamePrefix)

   * @param {string} pathnamePrefix
   */
  async loadMocha(page, pathnamePrefix) {
    await page.evaluate(() => (document.body.id = 'mocha'));
    await page.addStyleTag({
      url: `${pathnamePrefix}/node_modules/mocha/mocha.css`
    });
    await page.addScriptTag({
      url: `${pathnamePrefix}/node_modules/chai/chai.js`
    });
    await page.addScriptTag({
      url: `${pathnamePrefix}/node_modules/mocha/mocha.js`
    });
    await page.evaluate(
      (inspect, mochaGlobals) => {
        mocha.setup({
          ui: 'bdd',
          reporter: inspect ? 'html' : 'spec',
          color: !this.inspect
        });

        mocha.checkLeaks();

        // Expose mocha globals on the mocha object, to enable `import { describe } from 'mocha';`
        // in the browser version of mocha.
        // https://github.com/mochajs/mocha/issues/2765
        for (const name of mochaGlobals) {
          // @ts-ignore
          mocha[name] = self[name];
        }

        // mocha doesn't catch unhandledrejections yet.
        // https://github.com/mochajs/mocha/issues/2640
        addEventListener('unhandledrejection', event => event.reason);
      },
      this.inspect,
      this.mochaGlobals
    );
  }
}