Function createConfigurableRunner

testing/describes.js:375–379

* Creates a configurable version of a top-level describes runner. * @param {function(!Object):!Array<?Fixture>} factory

(factory)

 * @param {function(!Object):!Array<?Fixture>} factory
 */
function createConfigurableRunner(factory) {
  const runner = describeEnv(factory);
  runner.configure = () => new TestConfig(runner);
  return runner;
}

/** @interface */
class FixtureInterface {