@Test
 public void computeResourcePath() {
   assertEquals("styles/main.css", markupToEclipseHelp.computeResourcePath("styles/main.css", ""));
   assertEquals(
       "../styles/main.css", markupToEclipseHelp.computeResourcePath("styles/main.css", "one"));
   assertEquals(
       "../../styles/main.css",
       markupToEclipseHelp.computeResourcePath("styles/main.css", "one/two"));
   assertEquals(
       "/styles/main.css", markupToEclipseHelp.computeResourcePath("/styles/main.css", "prefix"));
   assertEquals(
       "http://example.com/main.css",
       markupToEclipseHelp.computeResourcePath("http://example.com/main.css", "prefix"));
 }
 @Test
 public void computeResourcePathInvalidUri() {
   thrown.expect(BuildFailureException.class);
   thrown.expectMessage("\":not valid\" is not a valid URI");
   markupToEclipseHelp.computeResourcePath(":not valid", "");
 }