@Test(expected = ConfigurationModeNotFoundException.class)
 public void env_no_mode() throws IOException {
   // Renderer
   when(httpRendererService.getRenderer(ConfigurationSet.class, MODE))
       .thenThrow(new RendererNotFoundException(ConfigurationSet.class, MODE));
   // Call
   MockHttpServletResponse response = new MockHttpServletResponse();
   get.env(APP_NAME, VERSION, ENV, MODE, VARIANT, response);
 }
 @Test
 public void env() throws IOException {
   // Renderer
   @SuppressWarnings("unchecked")
   HttpRenderer<ConfigurationSet> renderer = mock(HttpRenderer.class);
   when(httpRendererService.getRenderer(ConfigurationSet.class, MODE)).thenReturn(renderer);
   // Call
   MockHttpServletResponse response = new MockHttpServletResponse();
   get.env(APP_NAME, VERSION, ENV, MODE, VARIANT, response);
   // Checks the render call
   verify(renderer, times(1)).renderer(any(ConfigurationSet.class), eq(VARIANT), same(response));
 }