angular-docs-cn/modules/@angular/common/test/pipes/number_pipe_spec.ts

import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach,} from '@angular/core/testing/testing_internal';
import {browserDetection} from '@angular/platform-browser/testing';

import {DecimalPipe, PercentPipe, CurrencyPipe} from '@angular/common';

export function main() {
  describe('Number pipes', () => {
    // TODO(mlaval): enable tests when Intl API is no longer used, see
    // https://github.com/angular/angular/issues/3333
    // Have to restrict to Chrome as IE uses a different formatting
    if (browserDetection.supportsIntlApi && browserDetection.isChromeDesktop) {
      describe('DecimalPipe', () => {
        var pipe: DecimalPipe;

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

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

      describe('PercentPipe', () => {
        var pipe: PercentPipe;

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

        describe('transform', () => {
          it('should return correct value for numbers', () => {
            expect(pipe.transform(1.23)).toEqual('123%');
            expect(pipe.transform(1.2, '.2')).toEqual('120.00%');
          });

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

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

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

        describe('transform', () => {
          it('should return correct value for numbers', () => {
            expect(pipe.transform(123)).toEqual('USD123');
            expect(pipe.transform(12, 'EUR', false, '.2')).toEqual('EUR12.00');
            expect(pipe.transform(5.123, 'USD', false, '.0-2')).toEqual('USD5.12');
          });

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