angular-cn/modules/angular2/test/common/pipes/i18n_plural_pipe_spec.ts

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

import {I18nPluralPipe} from 'angular2/common';
import {PipeResolver} from 'angular2/src/core/linker/pipe_resolver';

export function main() {
  describe('I18nPluralPipe', () => {
    var pipe;
    var mapping = {'=0': 'No messages.', '=1': 'One message.', 'other': 'There are some messages.'};
    var interpolatedMapping = {
      '=0': 'No messages.',
      '=1': 'One message.',
      'other': 'There are # messages, that is #.'
    };

    beforeEach(() => { pipe = new I18nPluralPipe(); });

    it('should be marked as pure',
       () => { expect(new PipeResolver().resolve(I18nPluralPipe).pure).toEqual(true); });

    describe('transform', () => {
      it('should return 0 text if value is 0', () => {
        var val = pipe.transform(0, [mapping]);
        expect(val).toEqual('No messages.');
      });

      it('should return 1 text if value is 1', () => {
        var val = pipe.transform(1, [mapping]);
        expect(val).toEqual('One message.');
      });

      it('should return other text if value is anything other than 0 or 1', () => {
        var val = pipe.transform(6, [mapping]);
        expect(val).toEqual('There are some messages.');
      });

      it('should interpolate the value into the text where indicated', () => {
        var val = pipe.transform(6, [interpolatedMapping]);
        expect(val).toEqual('There are 6 messages, that is 6.');
      });

      it('should use \'other\' if value is undefined', () => {
        var messageLength;
        var val = pipe.transform(messageLength, [interpolatedMapping]);
        expect(val).toEqual('There are  messages, that is .');
      });

      it('should not support bad arguments',
         () => { expect(() => pipe.transform(0, ['hey'])).toThrowError(); });
    });

  });
}