import { TrimToLengthPipe } from './trim-to-length.pipe';

describe('TrimToLengthPipe', () => {
  it('create an instance', () => {
    const pipe = new TrimToLengthPipe();
    expect(pipe).toBeTruthy();
  });

  it('handles the empty string', () => {
    const pipe = new TrimToLengthPipe();
    expect(pipe.transform('', 5)).toEqual('');
  });

  it('handles null', () => {
    const pipe = new TrimToLengthPipe();
    expect(pipe.transform(null, 5)).toEqual('');
  });

  it('handles undefined', () => {
    const pipe = new TrimToLengthPipe();
    expect(pipe.transform(undefined, 5)).toEqual('');
  });

  it('does not trim string that is shorter than the desired length', () => {
    const pipe = new TrimToLengthPipe();
    expect(pipe.transform('hi', 5)).toEqual('hi');
  });

  it('trims a long string to desired length', () => {
    const pipe = new TrimToLengthPipe();
    expect(pipe.transform('It was the best of times, it was the worst of times', 5)).toEqual('It...');
  });
});