Function wrapTestInZone

packages/zone.js/lib/jest/jest.ts:77–105

* Gets a function wrapping the body of a jest `it/beforeEach/afterEach` block to * execute in a ProxyZone zone. * This will run in the `proxyZone`.

(testBody: Function, isTestFunc = false)

     * This will run in the `proxyZone`.
     */
    function wrapTestInZone(testBody: Function, isTestFunc = false): Function {
      if (typeof testBody !== 'function') {
        return testBody;
      }
      const wrappedFunc = function () {
        if (
          (Zone as any)[api.symbol('useFakeTimersCalled')] === true &&
          testBody &&
          !(testBody as any).isFakeAsync
        ) {
          // jest.useFakeTimers is called, run into fakeAsyncTest automatically.
          const fakeAsyncModule = (Zone as any)[Zone.__symbol__('fakeAsyncTest')];
          if (fakeAsyncModule && typeof fakeAsyncModule.fakeAsync === 'function') {
            testBody = fakeAsyncModule.fakeAsync(testBody);
          }
        }
        proxyZoneSpec.isTestFunc = isTestFunc;
        return proxyZone.run(testBody, null, arguments as any);
      };
      // Update the length of wrappedFunc to be the same as the length of the testBody
      // So jest core can handle whether the test function has `done()` or not correctly
      Object.defineProperty(wrappedFunc, 'length', {
        configurable: true,
        writable: true,
        enumerable: false,
      });
      wrappedFunc.length = testBody.length;
      return wrappedFunc;
    }

    ['describe', 'xdescribe', 'fdescribe'].forEach((methodName) => {
      let originalJestFn: Function = context[methodName];