Update tests

Author: ai

test/cases/broken.css

@@ -1 +1 @@
-a { one color: black }
+a { color:

test/test.js

@@ -12,10 +12,6 @@ describe('postcss-loader', function () {
         expect(css).to.eql('a { color: blue }\n');
     });
 
-    it('prints syntax errors without JS stacktrace', function () {
-        require('!raw-loader!../!./cases/broken.css');
-    });
-
     it('processes CSS in safe mode', function () {
         var css = require('!raw-loader!' +
                           '../?parser=postcss-safe-parser!' +