hunk.code_window:         let error = parse('a{}').first.error('Error', { plugin: 'test' });
           expect(error.plugin).to.eql('test');
           expect(error.toString()).to.match(
               /^CssSyntaxError: test:<css input>:1:1: Error/);
       });
   });
hunk.labels: keep keep keep replace keep keep keep
hunk.after_edit:             /^CssSyntaxError: test: <css input>:1:1: Error/);
  
hunk.file_path: test/css-syntax-error.js
hunk.type: replace
file: @page{ }
  