Function asyncJestTest

packages/jest-jasmine2/src/jasmineAsyncInstall.ts:156–187

(done: DoneFn)

    extraError.stack = originalExtraErrorStack;

    const asyncJestTest = function (done: DoneFn) {
      const wrappedFn = isGeneratorFn(fn) ? co.wrap(fn) : fn;
      const returnValue = wrappedFn.call({}, doneFnNoop);

      if (isPromise(returnValue)) {
        returnValue.then(done.bind(null, null), (error: Error) => {
          const {isError: checkIsError, message} = isError(error);

          if (message) {
            extraError.message = message;
            extraError.stack =
              originalExtraErrorStack &&
              originalExtraErrorStack.replace('Error: ', `Error: ${message}`);
          }

          if (jasmine.Spec.isPendingSpecException(error)) {
            env.pending(message!);
            done();
          } else {
            done.fail(checkIsError ? error : extraError);
          }
        });
      } else if (returnValue === undefined) {
        done();
      } else {
        done.fail(
          new Error(
            'Jest: `it` and `test` must return either a Promise or undefined.',
          ),
        );
      }
    };

    return originalFn.call(env, specName, asyncJestTest, timeout);
  };