ng2-pipes/src/app/pipes/string/shorten.spec.ts

Useful angular2 pipes

import {ShortenPipe} from "./shorten";

describe('ShortenPipe Tests', () => {
  let pipe:ShortenPipe;

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

  it('should not change the string if the length is more than the string size', () => {
    expect(pipe.transform('lorem ipsum', [20])).toEqual('lorem ipsum');
    expect(pipe.transform('lorem ipsum', [20, '..'])).toEqual('lorem ipsum');
  });

  it('should shorten the string', () => {
    expect(pipe.transform('lorem ipsum', [5])).toEqual('lorem');
    expect(pipe.transform('lorem ipsum', [7])).toEqual('lorem i');
  });

  it('should shorten the string with suffix', () => {
    expect(pipe.transform('lorem ipsum', [5, '...'])).toEqual('lorem...');
    expect(pipe.transform('lorem ipsum', [6, 'abc'])).toEqual('lorem abc');
  });

  it('should shorten the string without word breaking', () => {
    expect(pipe.transform('lorem ipsum', [4, '...', false])).toEqual('lorem...');
    expect(pipe.transform('lorem ipsum', [2, '...', false])).toEqual('lorem...');
    expect(pipe.transform('lorem ipsum', [7, '...', false])).toEqual('lorem ipsum');
  });
});