@Test
 public void alternativeIsNotAccessible() throws MalformedURLException {
   openWindowNoWait(deriveMappingForUI(PlainAlternativeUI.class));
   final String expectedErrorMessage = this.firstWindow.getBodyText();
   assertThat(expectedErrorMessage, containsString("404"));
   assertThat(PlainAlternativeUI.getNumberOfInstances(), is(0));
 }