angular-docs-cn/modules/angular2/test/change_detection/pipes/pipe_registry_spec.ts

import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach} from 'angular2/test_lib';

import {PipeRegistry} from 'angular2/src/change_detection/pipes/pipe_registry';
import {Pipe} from 'angular2/src/change_detection/pipes/pipe';

export function main() {
  describe("pipe registry", () => {
    var firstPipe = new Pipe();
    var secondPipe = new Pipe();

    it("should return the first pipe supporting the data type", () => {
      var r = new PipeRegistry(
          {"type": [new PipeFactory(false, firstPipe), new PipeFactory(true, secondPipe)]});

      expect(r.get("type", "some object", null)).toBe(secondPipe);
    });

    it("should throw when no matching type", () => {
      var r = new PipeRegistry({});
      expect(() => r.get("unknown", "some object", null))
          .toThrowError(`Cannot find 'unknown' pipe supporting object 'some object'`);
    });

    it("should throw when no matching pipe", () => {
      var r = new PipeRegistry({"type": []});

      expect(() => r.get("type", "some object", null))
          .toThrowError(`Cannot find 'type' pipe supporting object 'some object'`);
    });
  });
}

class PipeFactory {
  shouldSupport: boolean;
  pipe: any;

  constructor(shouldSupport: boolean, pipe: any) {
    this.shouldSupport = shouldSupport;
    this.pipe = pipe;
  }

  supports(obj): boolean { return this.shouldSupport; }

  create(cdRef): Pipe { return this.pipe; }
}