TypeScript testing_internal.beforeEach函数代码示例

      describe('getBaseHref', () => {
        beforeEach(() => getDOM().resetBaseElement());

        it('should return null if base element is absent',
           () => { expect(getDOM().getBaseHref(defaultDoc)).toBeNull(); });

        it('should return the value of the base element', () => {
          const baseEl = getDOM().createElement('base');
          getDOM().setAttribute(baseEl, 'href', '/drop/bass/connon/');
          const headEl = defaultDoc.head;
          getDOM().appendChild(headEl, baseEl);

          const baseHref = getDOM().getBaseHref(defaultDoc);
          getDOM().removeChild(headEl, baseEl);
          getDOM().resetBaseElement();

          expect(baseHref).toEqual('/drop/bass/connon/');
        });

        it('should return a relative url', () => {
          const baseEl = getDOM().createElement('base');
          getDOM().setAttribute(baseEl, 'href', 'base');
          const headEl = defaultDoc.head;
          getDOM().appendChild(headEl, baseEl);

          const baseHref = getDOM().getBaseHref(defaultDoc);
          getDOM().removeChild(headEl, baseEl);
          getDOM().resetBaseElement();

          expect(baseHref.endsWith('/base')).toBe(true);
        });
      });

  describe('SystemJsNgModuleLoader', () => {
    let oldSystem: any = null;
    beforeEach(() => {
      oldSystem = global['System'];
      global['System'] = mockSystem({
        'test.ngfactory':
            {'default': 'test module factory', 'NamedNgFactory': 'test NamedNgFactory'},
        'prefixed/test/suffixed': {'NamedNgFactory': 'test module factory'}
      });
    });
    afterEach(() => { global['System'] = oldSystem; });

    it('loads a default factory by appending the factory suffix', async(() => {
         const loader = new SystemJsNgModuleLoader(new Compiler());
         loader.load('test').then(contents => { expect(contents).toBe('test module factory'); });
       }));
    it('loads a named factory by appending the factory suffix', async(() => {
         const loader = new SystemJsNgModuleLoader(new Compiler());
         loader.load('test#Named').then(contents => {
           expect(contents).toBe('test NamedNgFactory');
         });
       }));
    it('loads a named factory with a configured prefix and suffix', async(() => {
         const loader = new SystemJsNgModuleLoader(new Compiler(), {
           factoryPathPrefix: 'prefixed/',
           factoryPathSuffix: '/suffixed',
         });
         loader.load('test#Named').then(contents => {
           expect(contents).toBe('test module factory');
         });
       }));
  });

    describe('CurrencyPipe', () => {
      let pipe: CurrencyPipe;

      beforeEach(() => { pipe = new CurrencyPipe('en-US'); });

      describe('transform', () => {
        it('should return correct value for numbers', () => {
          expect(pipe.transform(123)).toEqual('$123.00');
          expect(pipe.transform(12, 'EUR', 'code', '.1')).toEqual('EUR12.0');
          expect(pipe.transform(5.1234, 'USD', 'code', '.0-3')).toEqual('USD5.123');
          expect(pipe.transform(5.1234, 'USD', 'code')).toEqual('USD5.12');
          expect(pipe.transform(5.1234, 'USD', 'symbol')).toEqual('$5.12');
          expect(pipe.transform(5.1234, 'CAD', 'symbol')).toEqual('CA$5.12');
          expect(pipe.transform(5.1234, 'CAD', 'symbol-narrow')).toEqual('$5.12');
          expect(pipe.transform(5.1234, 'CAD', 'symbol-narrow', '5.2-2')).toEqual('$00,005.12');
          expect(pipe.transform(5.1234, 'CAD', 'symbol-narrow', '5.2-2', 'fr'))
              .toEqual('00 005,12 $');
        });

        it('should not support other objects',
           () => { expect(() => pipe.transform({})).toThrowError(); });

        it('should warn if you are using the v4 signature', () => {
          const warnSpy = spyOn(console, 'warn');
          pipe.transform(123, 'USD', true);
          expect(warnSpy).toHaveBeenCalledWith(
              `Warning: the currency pipe has been changed in Angular v5. The symbolDisplay option (third parameter) is now a string instead of a boolean. The accepted values are "code", "symbol" or "symbol-narrow".`);
        });
      });
    });

    describe('pending', () => {
      let c: FormControl;
      let a: FormArray;

      beforeEach(() => {
        c = new FormControl('value');
        a = new FormArray([c]);
      });

      it('should be false after creating a control', () => {
        expect(c.pending).toEqual(false);
        expect(a.pending).toEqual(false);
      });

      it('should be true after changing the value of the control', () => {
        c.markAsPending();

        expect(c.pending).toEqual(true);
        expect(a.pending).toEqual(true);
      });

      it('should not update the parent when onlySelf = true', () => {
        c.markAsPending({onlySelf: true});

        expect(c.pending).toEqual(true);
        expect(a.pending).toEqual(false);
      });
    });

  describe('ResourceLoaderImpl', () => {
    let resourceLoader: ResourceLoaderImpl;

    // TODO(juliemr): This file currently won't work with dart unit tests run using
    // exclusive it or describe (iit or ddescribe). This is because when
    // pub run test is executed against this specific file the relative paths
    // will be relative to here, so url200 should look like
    // static_assets/200.html.
    // We currently have no way of detecting this.
    const url200 = '/base/angular/packages/platform-browser/test/browser/static_assets/200.html';
    const url404 = '/bad/path/404.html';

    beforeEach(() => { resourceLoader = new ResourceLoaderImpl(); });

    it('should resolve the Promise with the file content on success',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         resourceLoader.get(url200).then((text) => {
           expect(text.trim()).toEqual('<p>hey</p>');
           async.done();
         });
       }), 10000);

    it('should reject the Promise on failure',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         resourceLoader.get(url404).catch((e) => {
           expect(e).toEqual(`Failed to load ${url404}`);
           async.done();
           return null;
         });
       }), 10000);
  });

      describe('transform', () => {
        let pipe: DecimalPipe;
        beforeEach(() => { pipe = new DecimalPipe('en-US'); });

        it('should return correct value for numbers', () => {
          expect(pipe.transform(12345)).toEqual('12,345');
          expect(pipe.transform(1.123456, '3.4-5')).toEqual('001.12346');
        });

        it('should support strings', () => {
          expect(pipe.transform('12345')).toEqual('12,345');
          expect(pipe.transform('123', '.2')).toEqual('123.00');
          expect(pipe.transform('1', '3.')).toEqual('001');
          expect(pipe.transform('1.1', '3.4-5')).toEqual('001.1000');
          expect(pipe.transform('1.123456', '3.4-5')).toEqual('001.12346');
          expect(pipe.transform('1.1234')).toEqual('1.123');
        });

        it('should not support other objects', () => {
          expect(() => pipe.transform({}))
              .toThrowError(
                  `InvalidPipeArgument: '[object Object] is not a number' for pipe 'DecimalPipe'`);
          expect(() => pipe.transform('123abc'))
              .toThrowError(`InvalidPipeArgument: '123abc is not a number' for pipe 'DecimalPipe'`);
        });
      });

      describe('status change events', () => {
        let logger: string[];

        beforeEach(() => {
          logger = [];
          a.statusChanges.subscribe((status) => logger.push(status));
        });

        it('should emit event after marking control as pending', () => {
          c.markAsPending();
          expect(logger).toEqual(['PENDING']);
        });

        it('should not emit event from parent when onlySelf is true', () => {
          c.markAsPending({onlySelf: true});
          expect(logger).toEqual([]);
        });

        it('should not emit event when emitEvent = false', () => {
          c.markAsPending({emitEvent: false});
          expect(logger).toEqual([]);
        });

        it('should emit event when parent is markedAsPending', () => {
          a.markAsPending();
          expect(logger).toEqual(['PENDING']);
        });
      });

    describe('DeprecatedDecimalPipe', () => {
      let pipe: DeprecatedDecimalPipe;

      beforeEach(() => { pipe = new DeprecatedDecimalPipe('en-US'); });

      describe('transform', () => {
        it('should return correct value for numbers', () => {
          expect(pipe.transform(12345)).toEqual('12,345');
          expect(pipe.transform(123, '.2')).toEqual('123.00');
          expect(pipe.transform(1, '3.')).toEqual('001');
          expect(pipe.transform(1.1, '3.4-5')).toEqual('001.1000');
          expect(pipe.transform(1.123456, '3.4-5')).toEqual('001.12346');
          expect(pipe.transform(1.1234)).toEqual('1.123');
        });

        it('should support strings', () => {
          expect(pipe.transform('12345')).toEqual('12,345');
          expect(pipe.transform('123', '.2')).toEqual('123.00');
          expect(pipe.transform('1', '3.')).toEqual('001');
          expect(pipe.transform('1.1', '3.4-5')).toEqual('001.1000');
          expect(pipe.transform('1.123456', '3.4-5')).toEqual('001.12346');
          expect(pipe.transform('1.1234')).toEqual('1.123');
        });

        it('should not support other objects', () => {
          expect(() => pipe.transform(new Object())).toThrowError();
          expect(() => pipe.transform('123abc')).toThrowError();
        });
      });
    });

      describe('disabled events', () => {
        let logger: string[];
        let c: FormControl;
        let g: FormGroup;

        beforeEach(() => {
          logger = [];
          c = new FormControl('', Validators.required);
          g = new FormGroup({one: c});
        });

        it('should emit a statusChange event when disabled status changes', () => {
          c.statusChanges.subscribe((status: string) => logger.push(status));

          c.disable();
          expect(logger).toEqual(['DISABLED']);

          c.enable();
          expect(logger).toEqual(['DISABLED', 'INVALID']);

        });

        it('should emit status change events in correct order', () => {
          c.statusChanges.subscribe(() => logger.push('control'));
          g.statusChanges.subscribe(() => logger.push('group'));

          c.disable();
          expect(logger).toEqual(['control', 'group']);
        });

        it('should throw when sync validator passed into async validator param', () => {
          const fn = () => new FormControl('', syncValidator, syncValidator);
          // test for the specific error since without the error check it would still throw an error
          // but
          // not a meaningful one
          expect(fn).toThrowError(`Expected validator to return Promise or Observable.`);
        });

        it('should not emit value change events when emitEvent = false', () => {
          c.valueChanges.subscribe(() => logger.push('control'));
          g.valueChanges.subscribe(() => logger.push('group'));

          c.disable({emitEvent: false});
          expect(logger).toEqual([]);
          c.enable({emitEvent: false});
          expect(logger).toEqual([]);
        });

        it('should not emit status change events when emitEvent = false', () => {
          c.statusChanges.subscribe(() => logger.push('control'));
          g.statusChanges.subscribe(() => logger.push('form'));

          c.disable({emitEvent: false});
          expect(logger).toEqual([]);
          c.enable({emitEvent: false});
          expect(logger).toEqual([]);
        });

      });