code: @Test public void shouldLoadWroConfigurationFromServletContextAttribute() throws Exception {
    final WroFilter filter=new WroFilter();
    final WroConfiguration expectedConfig=new WroConfiguration();
    final ServletContextAttributeHelper helper=new ServletContextAttributeHelper(mockServletContext);
    Mockito.when(mockServletContext.getAttribute(helper.getAttributeName(Attribute.CONFIGURATION))).thenReturn(expectedConfig);
    filter.init(mockFilterConfig);
    Assert.assertSame(expectedConfig,filter.getConfiguration());
  }
  