old_contents: var postcss = require('postcss'),
      plugin = require('./');
  
  function run(input, output, opts) {
      return postcss([ plugin(opts) ]).process(input)
          .then(result => {
              expect(result.css).toEqual(output);
              expect(result.warnings().length).toBe(0);
          });
  }
  
  it('should trasform \'display: nope;\' to \'display: none;\'', () => {
      return run('a{display: nope;}', 'a{display: none;}', {});
  });
  
  it('should not trasform \'content: "nope";\'', () => {
      return run('a:after{content: "nope";}', 'a:after{content: "nope";}', {});
  });
  
new_contents: var postcss = require('postcss'),
      plugin = require('./');
  
  function run(input, output, opts) {
      return postcss([ plugin(opts) ]).process(input)
          .then(result => {
              expect(result.css).toEqual(output);
              expect(result.warnings().length).toBe(0);
          });
  }
  
  it('should trasform \'display: nope;\' to \'display: none;\'', () => {
      return run('a{display: nope;}', 'a{display: none;}', {});
  });
  
  it('should not trasform \'content: "nope";\'', () => {
      return run('a:after{content: "nope";}', 'a:after{content: "nope";}', {});
  });
  
  it('should trasform \'nope\' to \'none\' leaving \'important!\'', () => {
      return run( 'a{display: nope !important;}',
                  'a{display: none !important;}', {});
  });
  
subject: Add test with important