How to use the @angular-devkit/architect/testing.runTargetSpec function in @angular-devkit/architect

it('works', (done) => {
      runTargetSpec(angularHost, webpackTargetSpec).pipe(
        tap((buildEvent) => expect(buildEvent.success).toBe(true)),
        tap(() => {
          expect(angularHost.scopedSync().exists(join(outputPath, 'main.js'))).toBe(true);
          expect(angularHost.scopedSync().exists(join(outputPath, 'polyfills.js'))).toBe(true);
        }),
      ).toPromise().then(done, done.fail);
    });
  });

it('works', (done) => {
      runTargetSpec(basicHost, webpackTargetSpec).pipe(
        tap((buildEvent) => expect(buildEvent.success).toBe(true)),
        tap(() => {
          expect(basicHost.scopedSync().exists(join(outputPath, 'bundle.js'))).toBe(true);
        }),
      ).toPromise().then(done, done.fail);
    });
  });