code: @Test public void shouldGenerateGroupMappingUsingNoOpNamingStrategy() throws Exception {
    setWroWithValidResources();
    final File groupNameMappingFile=new File(FileUtils.getTempDirectory(),"groupMapping-" + new Date().getTime());
    victim.setGroupNameMappingFile(groupNameMappingFile);
    victim.setIgnoreMissingResources(true);
    victim.execute();
    final Properties groupNames=new Properties();
    groupNames.load(new FileInputStream(groupNameMappingFile));
    LOG.debug("groupNames: {}",groupNames);
    assertEquals("g1.js",groupNames.get("g1.js"));
    FileUtils.deleteQuietly(groupNameMappingFile);
  }
  