angular-docs-cn/modules/@angular/compiler/test/directive_resolver_spec.ts

import {ddescribe, describe, it, iit, expect, beforeEach} from '@angular/core/testing';
import {DirectiveResolver} from '@angular/compiler/src/directive_resolver';
import {
  DirectiveMetadata,
  Directive,
  Input,
  Output,
  HostBinding,
  HostListener,
  ContentChildren,
  ContentChildrenMetadata,
  ViewChildren,
  ViewChildrenMetadata,
  ContentChild,
  ContentChildMetadata,
  ViewChild,
  ViewChildMetadata
} from '@angular/core/src/metadata';

@Directive({selector: 'someDirective'})
class SomeDirective {
}

@Directive({selector: 'someChildDirective'})
class SomeChildDirective extends SomeDirective {
}

@Directive({selector: 'someDirective', inputs: ['c']})
class SomeDirectiveWithInputs {
  @Input() a;
  @Input("renamed") b;
  c;
}

@Directive({selector: 'someDirective', outputs: ['c']})
class SomeDirectiveWithOutputs {
  @Output() a;
  @Output("renamed") b;
  c;
}


@Directive({selector: 'someDirective', outputs: ['a']})
class SomeDirectiveWithDuplicateOutputs {
  @Output() a;
}

@Directive({selector: 'someDirective', properties: ['a']})
class SomeDirectiveWithProperties {
}

@Directive({selector: 'someDirective', events: ['a']})
class SomeDirectiveWithEvents {
}

@Directive({selector: 'someDirective'})
class SomeDirectiveWithSetterProps {
  @Input("renamed")
  set a(value) {
  }
}

@Directive({selector: 'someDirective'})
class SomeDirectiveWithGetterOutputs {
  @Output("renamed")
  get a() {
    return null;
  }
}

@Directive({selector: 'someDirective', host: {'[c]': 'c'}})
class SomeDirectiveWithHostBindings {
  @HostBinding() a;
  @HostBinding("renamed") b;
  c;
}

@Directive({selector: 'someDirective', host: {'(c)': 'onC()'}})
class SomeDirectiveWithHostListeners {
  @HostListener('a')
  onA() {
  }
  @HostListener('b', ['$event.value'])
  onB(value) {
  }
}

@Directive({selector: 'someDirective', queries: {"cs": new ContentChildren("c")}})
class SomeDirectiveWithContentChildren {
  @ContentChildren("a") as: any;
  c;
}

@Directive({selector: 'someDirective', queries: {"cs": new ViewChildren("c")}})
class SomeDirectiveWithViewChildren {
  @ViewChildren("a") as: any;
  c;
}

@Directive({selector: 'someDirective', queries: {"c": new ContentChild("c")}})
class SomeDirectiveWithContentChild {
  @ContentChild("a") a: any;
  c;
}

@Directive({selector: 'someDirective', queries: {"c": new ViewChild("c")}})
class SomeDirectiveWithViewChild {
  @ViewChild("a") a: any;
  c;
}

class SomeDirectiveWithoutMetadata {}

export function main() {
  describe("DirectiveResolver", () => {
    var resolver: DirectiveResolver;

    beforeEach(() => { resolver = new DirectiveResolver(); });

    it('should read out the Directive metadata', () => {
      var directiveMetadata = resolver.resolve(SomeDirective);
      expect(directiveMetadata)
          .toEqual(new DirectiveMetadata(
              {selector: 'someDirective', inputs: [], outputs: [], host: {}, queries: {}}));
    });

    it('should throw if not matching metadata is found', () => {
      expect(() => { resolver.resolve(SomeDirectiveWithoutMetadata); })
          .toThrowError('No Directive annotation found on SomeDirectiveWithoutMetadata');
    });

    it('should not read parent class Directive metadata', function() {
      var directiveMetadata = resolver.resolve(SomeChildDirective);
      expect(directiveMetadata)
          .toEqual(new DirectiveMetadata(
              {selector: 'someChildDirective', inputs: [], outputs: [], host: {}, queries: {}}));
    });

    describe('inputs', () => {
      it('should append directive inputs', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithInputs);
        expect(directiveMetadata.inputs).toEqual(['c', 'a', 'b: renamed']);
      });

      it('should work with getters and setters', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithSetterProps);
        expect(directiveMetadata.inputs).toEqual(['a: renamed']);
      });

    });

    describe('outputs', () => {
      it('should append directive outputs', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithOutputs);
        expect(directiveMetadata.outputs).toEqual(['c', 'a', 'b: renamed']);
      });

      it('should work with getters and setters', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithGetterOutputs);
        expect(directiveMetadata.outputs).toEqual(['a: renamed']);
      });

      it('should throw if duplicate outputs', () => {
        expect(() => { resolver.resolve(SomeDirectiveWithDuplicateOutputs); })
            .toThrowError(
                `Output event 'a' defined multiple times in 'SomeDirectiveWithDuplicateOutputs'`);
      });
    });

    describe('host', () => {
      it('should append host bindings', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithHostBindings);
        expect(directiveMetadata.host).toEqual({'[c]': 'c', '[a]': 'a', '[renamed]': 'b'});
      });

      it('should append host listeners', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithHostListeners);
        expect(directiveMetadata.host)
            .toEqual({'(c)': 'onC()', '(a)': 'onA()', '(b)': 'onB($event.value)'});
      });
    });

    describe('queries', () => {
      it('should append ContentChildren', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithContentChildren);
        expect(directiveMetadata.queries)
            .toEqual({"cs": new ContentChildren("c"), "as": new ContentChildren("a")});
      });

      it('should append ViewChildren', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithViewChildren);
        expect(directiveMetadata.queries)
            .toEqual({"cs": new ViewChildren("c"), "as": new ViewChildren("a")});
      });

      it('should append ContentChild', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithContentChild);
        expect(directiveMetadata.queries)
            .toEqual({"c": new ContentChild("c"), "a": new ContentChild("a")});
      });

      it('should append ViewChild', () => {
        var directiveMetadata = resolver.resolve(SomeDirectiveWithViewChild);
        expect(directiveMetadata.queries)
            .toEqual({"c": new ViewChild("c"), "a": new ViewChild("a")});
      });
    });
  });
}