code: @Test public void testCopyrightStripperProcessor() throws Exception {
    final ResourcePreProcessor decoratedProcessor=new CssMinProcessor();
    final ResourcePreProcessor processor=CopyrightKeeperProcessorDecorator.decorate(decoratedProcessor);
    final URL url=ResourcePreProcessor.class.getResource("copyright");
    final File testFolder=new File(url.getFile(),"test");
    final File expectedFolder=new File(url.getFile(),"expected");
    WroTestUtils.compareFromDifferentFoldersByExtension(testFolder,expectedFolder,"css",processor);
  }
  