Function fetchCoverage_

build-system/tasks/e2e/index.js:97–134

* Fetch aggregated coverage data from server. * @param {string} outDir relative path to coverage files directory. * @return {Promise }

(outDir)

 * @return {Promise<void>}
 */
async function fetchCoverage_(outDir) {
  // Note: We could access the coverage UI directly through the server started
  // for the e2e tests, but then that coverage data would vanish once that
  // server instance was closed. This method will persist the coverage data so
  // it can be accessed separately.

  // Clear out previous coverage data.
  fs.rmSync(outDir, {recursive: true});
  fs.mkdirSync(outDir);

  const zipFilename = path.join(outDir, 'coverage.zip');
  const zipFile = fs.createWriteStream(zipFilename);

  await /** @type {Promise<void>} */ (
    new Promise((resolve, reject) => {
      http
        .get(
          {
            host: HOST,
            port: PORT,
            path: COV_DOWNLOAD_PATH,
          },
          (response) => {
            response.pipe(zipFile);
            zipFile.on('finish', () => {
              zipFile.close();
              resolve();
            });
          }
        )
        .on('error', (err) => {
          fs.unlinkSync(zipFilename);
          reject(err);
        });
    })
  );
  execOrDie(`unzip -o ${zipFilename} -d ${outDir}`);
}

/**
 * Runs e2e tests on all files under test.