TypeScript testing_internal.it函數代碼示例

 t.describe('valid URLs', () => {
   const validUrls = [
     '',
     'http://abc',
     'HTTP://abc',
     'https://abc',
     'HTTPS://abc',
     'ftp://abc',
     'FTP://abc',
     'mailto:me@example.com',
     'MAILTO:me@example.com',
     'tel:123-123-1234',
     'TEL:123-123-1234',
     '#anchor',
     '/page1.md',
     'http://JavaScript/my.js',
     'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',  // Truncated.
     'data:video/webm;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
     'data:audio/opus;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
   ];
   for (const url of validUrls) {
     t.it(`valid ${url}`, () => t.expect(sanitizeUrl(url)).toEqual(url));
   }
 });

    describe('isNumeric', () => {
      it('should return true when passing correct numeric string',
         () => { expect(isNumeric('2')).toBe(true); });

      it('should return true when passing correct double string',
         () => { expect(isNumeric('1.123')).toBe(true); });

      it('should return true when passing correct negative string',
         () => { expect(isNumeric('-2')).toBe(true); });

      it('should return true when passing correct scientific notation string',
         () => { expect(isNumeric('1e5')).toBe(true); });

      it('should return false when passing incorrect numeric',
         () => { expect(isNumeric('a')).toBe(false); });

      it('should return false when passing parseable but non numeric',
         () => { expect(isNumeric('2a')).toBe(false); });
    });

    describe('required', () => {
      it('should error on an empty string',
         () => { expect(Validators.required(new FormControl(''))).toEqual({'required': true}); });

      it('should error on null',
         () => { expect(Validators.required(new FormControl(null))).toEqual({'required': true}); });

      it('should not error on undefined', () => {
        expect(Validators.required(new FormControl(undefined))).toEqual({'required': true});
      });

      it('should not error on a non-empty string',
         () => { expect(Validators.required(new FormControl('not empty'))).toBeNull(); });

      it('should accept zero as valid',
         () => { expect(Validators.required(new FormControl(0))).toBeNull(); });

      it('should error on an empty array',
         () => expect(Validators.required(new FormControl([]))).toEqual({'required': true}));

      it('should not error on a non-empty array',
         () => expect(Validators.required(new FormControl([1, 2]))).toBeNull());
    });

    describe('devModeEqual', () => {
      it('should do the deep comparison of iterables', () => {
        expect(devModeEqual([['one']], [['one']])).toBe(true);
        expect(devModeEqual(['one'], ['one', 'two'])).toBe(false);
        expect(devModeEqual(['one', 'two'], ['one'])).toBe(false);
        expect(devModeEqual(['one'], 'one')).toBe(false);
        expect(devModeEqual(['one'], new Object())).toBe(false);
        expect(devModeEqual('one', ['one'])).toBe(false);
        expect(devModeEqual(new Object(), ['one'])).toBe(false);
      });

      it('should compare primitive numbers', () => {
        expect(devModeEqual(1, 1)).toBe(true);
        expect(devModeEqual(1, 2)).toBe(false);
        expect(devModeEqual(new Object(), 2)).toBe(false);
        expect(devModeEqual(1, new Object())).toBe(false);
      });

      it('should compare primitive strings', () => {
        expect(devModeEqual('one', 'one')).toBe(true);
        expect(devModeEqual('one', 'two')).toBe(false);
        expect(devModeEqual(new Object(), 'one')).toBe(false);
        expect(devModeEqual('one', new Object())).toBe(false);
      });

      it('should compare primitive booleans', () => {
        expect(devModeEqual(true, true)).toBe(true);
        expect(devModeEqual(true, false)).toBe(false);
        expect(devModeEqual(new Object(), true)).toBe(false);
        expect(devModeEqual(true, new Object())).toBe(false);
      });

      it('should compare null', () => {
        expect(devModeEqual(null, null)).toBe(true);
        expect(devModeEqual(null, 1)).toBe(false);
        expect(devModeEqual(new Object(), null)).toBe(false);
        expect(devModeEqual(null, new Object())).toBe(false);
      });

      it('should return true for other objects',
         () => { expect(devModeEqual(new Object(), new Object())).toBe(true); });
    });

 describe('body serialization', () => {
   const baseReq = new HttpRequest('/test/', 'POST', null);
   it('handles a null body', () => { expect(baseReq.serializeBody()).toBeNull(); });
   it('passes ArrayBuffers through', () => {
     const body = new ArrayBuffer(4);
     expect(baseReq.clone({body}).serializeBody()).toBe(body);
   });
   it('passes strings through', () => {
     const body = 'hello world';
     expect(baseReq.clone({body}).serializeBody()).toBe(body);
   });
   it('serializes arrays as json', () => {
     expect(baseReq.clone({body: ['a', 'b']}).serializeBody()).toBe('["a","b"]');
   });
   it('handles numbers as json',
      () => { expect(baseReq.clone({body: 314159}).serializeBody()).toBe('314159'); });
   it('handles objects as json', () => {
     const req = baseReq.clone({body: {data: 'test data'}});
     expect(req.serializeBody()).toBe('{"data":"test data"}');
   });
 });

 describe('content type detection', () => {
   const baseReq = new HttpRequest('POST', '/test', null);
   it('handles a null body', () => { expect(baseReq.detectContentTypeHeader()).toBeNull(); });
   it('doesn\'t associate a content type with ArrayBuffers', () => {
     const req = baseReq.clone({body: new ArrayBuffer(4)});
     expect(req.detectContentTypeHeader()).toBeNull();
   });
   it('handles strings as text', () => {
     const req = baseReq.clone({body: 'hello world'});
     expect(req.detectContentTypeHeader()).toBe('text/plain');
   });
   it('handles arrays as json', () => {
     const req = baseReq.clone({body: ['a', 'b']});
     expect(req.detectContentTypeHeader()).toBe('application/json');
   });
   it('handles numbers as json', () => {
     const req = baseReq.clone({body: 314159});
     expect(req.detectContentTypeHeader()).toBe('application/json');
   });
   it('handles objects as json', () => {
     const req = baseReq.clone({body: {data: 'test data'}});
     expect(req.detectContentTypeHeader()).toBe('application/json');
   });
 });

 describe('object dictionary', () => {
   it('should transform a basic dictionary', () => {
     const pipe = new KeyValuePipe(defaultKeyValueDiffers);
     expect(pipe.transform({1: 2})).toEqual([{key: '1', value: 2}]);
   });
   it('should order by alpha', () => {
     const pipe = new KeyValuePipe(defaultKeyValueDiffers);
     expect(pipe.transform({'b': 1, 'a': 1})).toEqual([
       {key: 'a', value: 1}, {key: 'b', value: 1}
     ]);
   });
   it('should order by numerical', () => {
     const pipe = new KeyValuePipe(defaultKeyValueDiffers);
     expect(pipe.transform({2: 1, 1: 1})).toEqual([{key: '1', value: 1}, {key: '2', value: 1}]);
   });
   it('should order by numerical and alpha', () => {
     const pipe = new KeyValuePipe(defaultKeyValueDiffers);
     const input = {2: 1, 1: 1, 'b': 1, 0: 1, 3: 1, 'a': 1};
     expect(pipe.transform(input)).toEqual([
       {key: '0', value: 1}, {key: '1', value: 1}, {key: '2', value: 1}, {key: '3', value: 1},
       {key: 'a', value: 1}, {key: 'b', value: 1}
     ]);
   });
   it('should return the same ref if nothing changes', () => {
     const pipe = new KeyValuePipe(defaultKeyValueDiffers);
     const transform1 = pipe.transform({1: 2});
     const transform2 = pipe.transform({1: 2});
     expect(transform1 === transform2).toEqual(true);
   });
   it('should return a new ref if something changes', () => {
     const pipe = new KeyValuePipe(defaultKeyValueDiffers);
     const transform1 = pipe.transform({1: 2});
     const transform2 = pipe.transform({1: 3});
     expect(transform1 !== transform2).toEqual(true);
   });
 });

  describe('QueryList', () => {
    let queryList: QueryList<string>;
    let log: string;
    beforeEach(() => {
      queryList = new QueryList<string>();
      log = '';
    });

    function logAppend(item: any /** TODO #9100 */) { log += (log.length == 0 ? '' : ', ') + item; }

    it('should support resetting and iterating over the new objects', () => {
      queryList.reset(['one']);
      queryList.reset(['two']);
      iterateListLike(queryList, logAppend);
      expect(log).toEqual('two');
    });

    it('should support length', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.length).toEqual(2);
    });

    it('should support map', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.map((x) => x)).toEqual(['one', 'two']);
    });

    it('should support map with index', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.map((x, i) => `${x}_${i}`)).toEqual(['one_0', 'two_1']);
    });

    it('should support forEach', () => {
      queryList.reset(['one', 'two']);
      let join = '';
      queryList.forEach((x) => join = join + x);
      expect(join).toEqual('onetwo');
    });

    it('should support forEach with index', () => {
      queryList.reset(['one', 'two']);
      let join = '';
      queryList.forEach((x, i) => join = join + x + i);
      expect(join).toEqual('one0two1');
    });

    it('should support filter', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.filter((x: string) => x == 'one')).toEqual(['one']);
    });

    it('should support filter with index', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.filter((x: string, i: number) => i == 0)).toEqual(['one']);
    });

    it('should support find', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.find((x: string) => x == 'two')).toEqual('two');
    });

    it('should support find with index', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.find((x: string, i: number) => i == 1)).toEqual('two');
    });

    it('should support reduce', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.reduce((a: string, x: string) => a + x, 'start:')).toEqual('start:onetwo');
    });

    it('should support reduce with index', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.reduce((a: string, x: string, i: number) => a + x + i, 'start:'))
          .toEqual('start:one0two1');
    });

    it('should support toArray', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.reduce((a: string, x: string) => a + x, 'start:')).toEqual('start:onetwo');
    });

    it('should support toArray', () => {
      queryList.reset(['one', 'two']);
      expect(queryList.toArray()).toEqual(['one', 'two']);
    });

    it('should support toString', () => {
      queryList.reset(['one', 'two']);
      const listString = queryList.toString();
      expect(listString.indexOf('one') != -1).toBeTruthy();
      expect(listString.indexOf('two') != -1).toBeTruthy();
    });

    it('should support first and last', () => {
      queryList.reset(['one', 'two', 'three']);
      expect(queryList.first).toEqual('one');
      expect(queryList.last).toEqual('three');
    });

//.........這裏部分代碼省略.........

 describe('XhrBackend', () => {
   let factory: MockXhrFactory = null !;
   let backend: HttpXhrBackend = null !;
   beforeEach(() => {
     factory = new MockXhrFactory();
     backend = new HttpXhrBackend(factory);
   });
   it('emits status immediately', () => {
     const events = trackEvents(backend.handle(TEST_POST));
     expect(events.length).toBe(1);
     expect(events[0].type).toBe(HttpEventType.Sent);
   });
   it('sets method, url, and responseType correctly', () => {
     backend.handle(TEST_POST).subscribe();
     expect(factory.mock.method).toBe('POST');
     expect(factory.mock.responseType).toBe('text');
     expect(factory.mock.url).toBe('/test');
   });
   it('sets outgoing body correctly', () => {
     backend.handle(TEST_POST).subscribe();
     expect(factory.mock.body).toBe('some body');
   });
   it('sets outgoing headers, including default headers', () => {
     const post = TEST_POST.clone({
       setHeaders: {
         'Test': 'Test header',
       },
     });
     backend.handle(post).subscribe();
     expect(factory.mock.mockHeaders).toEqual({
       'Test': 'Test header',
       'Accept': 'application/json, text/plain, */*',
       'Content-Type': 'text/plain',
     });
   });
   it('sets outgoing headers, including overriding defaults', () => {
     const setHeaders = {
       'Test': 'Test header',
       'Accept': 'text/html',
       'Content-Type': 'text/css',
     };
     backend.handle(TEST_POST.clone({setHeaders})).subscribe();
     expect(factory.mock.mockHeaders).toEqual(setHeaders);
   });
   it('passes withCredentials through', () => {
     backend.handle(TEST_POST.clone({withCredentials: true})).subscribe();
     expect(factory.mock.withCredentials).toBe(true);
   });
   it('handles a text response', () => {
     const events = trackEvents(backend.handle(TEST_POST));
     factory.mock.mockFlush(200, 'OK', 'some response');
     expect(events.length).toBe(2);
     expect(events[1].type).toBe(HttpEventType.Response);
     expect(events[1] instanceof HttpResponse).toBeTruthy();
     const res = events[1] as HttpResponse<string>;
     expect(res.body).toBe('some response');
     expect(res.status).toBe(200);
     expect(res.statusText).toBe('OK');
   });
   it('handles a json response', () => {
     const events = trackEvents(backend.handle(TEST_POST.clone({responseType: 'json'})));
     factory.mock.mockFlush(200, 'OK', JSON.stringify({data: 'some data'}));
     expect(events.length).toBe(2);
     const res = events[1] as HttpResponse<{data: string}>;
     expect(res.body !.data).toBe('some data');
   });
   it('handles a blank json response', () => {
     const events = trackEvents(backend.handle(TEST_POST.clone({responseType: 'json'})));
     factory.mock.mockFlush(200, 'OK', '');
     expect(events.length).toBe(2);
     const res = events[1] as HttpResponse<{data: string}>;
     expect(res.body).toBeNull();
   });
   it('handles a json error response', () => {
     const events = trackEvents(backend.handle(TEST_POST.clone({responseType: 'json'})));
     factory.mock.mockFlush(500, 'Error', JSON.stringify({data: 'some data'}));
     expect(events.length).toBe(2);
     const res = events[1] as any as HttpErrorResponse;
     expect(res.error !.data).toBe('some data');
   });
   it('handles a json error response with XSSI prefix', () => {
     const events = trackEvents(backend.handle(TEST_POST.clone({responseType: 'json'})));
     factory.mock.mockFlush(500, 'Error', XSSI_PREFIX + JSON.stringify({data: 'some data'}));
     expect(events.length).toBe(2);
     const res = events[1] as any as HttpErrorResponse;
     expect(res.error !.data).toBe('some data');
   });
   it('handles a json string response', () => {
     const events = trackEvents(backend.handle(TEST_POST.clone({responseType: 'json'})));
     expect(factory.mock.responseType).toEqual('text');
     factory.mock.mockFlush(200, 'OK', JSON.stringify('this is a string'));
     expect(events.length).toBe(2);
     const res = events[1] as HttpResponse<string>;
     expect(res.body).toEqual('this is a string');
   });
   it('handles a json response with an XSSI prefix', () => {
     const events = trackEvents(backend.handle(TEST_POST.clone({responseType: 'json'})));
     factory.mock.mockFlush(200, 'OK', XSSI_PREFIX + JSON.stringify({data: 'some data'}));
     expect(events.length).toBe(2);
     const res = events[1] as HttpResponse<{data: string}>;
//.........這裏部分代碼省略.........

  describe('fake async', () => {
    it('should run synchronous code', () => {
      let ran = false;
      fakeAsync(() => { ran = true; })();

      expect(ran).toEqual(true);
    });

    it('should pass arguments to the wrapped function', () => {
      fakeAsync((foo: any /** TODO #9100 */, bar: any /** TODO #9100 */) => {
        expect(foo).toEqual('foo');
        expect(bar).toEqual('bar');
      })('foo', 'bar');
    });

    it('should work with inject()', fakeAsync(inject([Parser], (parser: any /** TODO #9100 */) => {
         expect(parser).toBeAnInstanceOf(Parser);
       })));

    it('should throw on nested calls', () => {
      expect(() => {
        fakeAsync(() => { fakeAsync((): any /** TODO #9100 */ => null)(); })();
      }).toThrowError('fakeAsync() calls can not be nested');
    });

    it('should flush microtasks before returning', () => {
      let thenRan = false;

      fakeAsync(() => { resolvedPromise.then(_ => { thenRan = true; }); })();

      expect(thenRan).toEqual(true);
    });


    it('should propagate the return value',
       () => { expect(fakeAsync(() => 'foo')()).toEqual('foo'); });

    describe('Promise', () => {
      it('should run asynchronous code', fakeAsync(() => {
           let thenRan = false;
           resolvedPromise.then((_) => { thenRan = true; });

           expect(thenRan).toEqual(false);

           flushMicrotasks();
           expect(thenRan).toEqual(true);
         }));

      it('should run chained thens', fakeAsync(() => {
           const log = new Log();

           resolvedPromise.then((_) => log.add(1)).then((_) => log.add(2));

           expect(log.result()).toEqual('');

           flushMicrotasks();
           expect(log.result()).toEqual('1; 2');
         }));

      it('should run Promise created in Promise', fakeAsync(() => {
           const log = new Log();

           resolvedPromise.then((_) => {
             log.add(1);
             resolvedPromise.then((_) => log.add(2));
           });

           expect(log.result()).toEqual('');

           flushMicrotasks();
           expect(log.result()).toEqual('1; 2');
         }));

      it('should complain if the test throws an exception during async calls', () => {
        expect(() => {
          fakeAsync(() => {
            resolvedPromise.then((_) => { throw new Error('async'); });
            flushMicrotasks();
          })();
        }).toThrowError(/Uncaught \(in promise\): Error: async/);
      });

      it('should complain if a test throws an exception', () => {
        expect(() => { fakeAsync(() => { throw new Error('sync'); })(); }).toThrowError('sync');
      });

    });

    describe('timers', () => {
      it('should run queued zero duration timer on zero tick', fakeAsync(() => {
           let ran = false;
           setTimeout(() => { ran = true; }, 0);

           expect(ran).toEqual(false);

           tick();
           expect(ran).toEqual(true);
         }));


//.........這裏部分代碼省略.........