angular-cn/packages/zone.js/test/browser/registerElement.spec.ts

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

/*
 * check that document.registerElement(name, { prototype: proto });
 * is properly patched
 */

import {ifEnvSupports} from '../test-util';

function registerElement() {
  return ('registerElement' in document) && (typeof customElements === 'undefined');
}
(<any>registerElement).message = 'document.registerElement';

describe(
    'document.registerElement', ifEnvSupports(registerElement, function() {
      // register a custom element for each callback
      const callbackNames = ['created', 'attached', 'detached', 'attributeChanged'];
      const callbacks: any = {};
      const testZone = Zone.current.fork({name: 'test'});
      let customElements;

      customElements = testZone.run(function() {
        callbackNames.forEach(function(callbackName) {
          const fullCallbackName = callbackName + 'Callback';
          const proto = Object.create(HTMLElement.prototype);
          (proto as any)[fullCallbackName] = function(arg: any) {
            callbacks[callbackName](arg);
          };
          (<any>document).registerElement('x-' + callbackName.toLowerCase(), {prototype: proto});
        });
      });

      it('should work with createdCallback', function(done) {
        callbacks.created = function() {
          expect(Zone.current).toBe(testZone);
          done();
        };

        document.createElement('x-created');
      });


      it('should work with attachedCallback', function(done) {
        callbacks.attached = function() {
          expect(Zone.current).toBe(testZone);
          done();
        };

        const elt = document.createElement('x-attached');
        document.body.appendChild(elt);
        document.body.removeChild(elt);
      });


      it('should work with detachedCallback', function(done) {
        callbacks.detached = function() {
          expect(Zone.current).toBe(testZone);
          done();
        };

        const elt = document.createElement('x-detached');
        document.body.appendChild(elt);
        document.body.removeChild(elt);
      });


      it('should work with attributeChanged', function(done) {
        callbacks.attributeChanged = function() {
          expect(Zone.current).toBe(testZone);
          done();
        };

        const elt = document.createElement('x-attributechanged');
        elt.id = 'bar';
      });


      it('should work with non-writable, non-configurable prototypes created with defineProperty',
         function(done) {
           testZone.run(function() {
             const proto = Object.create(HTMLElement.prototype);

             Object.defineProperty(
                 proto, 'createdCallback',
                 <any>{writable: false, configurable: false, value: checkZone});

             (<any>document).registerElement('x-prop-desc', {prototype: proto});

             function checkZone() {
               expect(Zone.current).toBe(testZone);
               done();
             }
           });

           const elt = document.createElement('x-prop-desc');
         });


      it('should work with non-writable, non-configurable prototypes created with defineProperties',
         function(done) {
           testZone.run(function() {
             const proto = Object.create(HTMLElement.prototype);

             Object.defineProperties(proto, {
               createdCallback: <any> {
                 writable: false, configurable: false, value: checkZone
               }
             });

             (<any>document).registerElement('x-props-desc', {prototype: proto});

             function checkZone() {
               expect(Zone.current).toBe(testZone);
               done();
             }
           });

           const elt = document.createElement('x-props-desc');
         });

      it('should not throw with frozen prototypes ', function() {
        testZone.run(function() {
          const proto = Object.create(HTMLElement.prototype, Object.freeze(<PropertyDescriptorMap>{
            createdCallback: <PropertyDescriptor> {
              value: () => {}, writable: true, configurable: true
            }
          }));

          Object.defineProperty(
              proto, 'createdCallback', <any>{writable: false, configurable: false});

          expect(function() {
            (<any>document).registerElement('x-frozen-desc', {prototype: proto});
          }).not.toThrow();
        });
      });


      it('should check bind callback if not own property', function(done) {
        testZone.run(function() {
          const originalProto = {createdCallback: checkZone};

          const secondaryProto = Object.create(originalProto);
          expect(secondaryProto.createdCallback).toBe(originalProto.createdCallback);

          (<any>document).registerElement('x-inherited-callback', {prototype: secondaryProto});
          expect(secondaryProto.createdCallback).not.toBe(originalProto.createdCallback);

          function checkZone() {
            expect(Zone.current).toBe(testZone);
            done();
          }

          const elt = document.createElement('x-inherited-callback');
        });
      });


      it('should not throw if no options passed to registerElement', function() {
        expect(function() {
          (<any>document).registerElement('x-no-opts');
        }).not.toThrow();
      });
    }));