public abstract boolean exists();
@Test
    public void testApplicationFileExists() throws Exception {
        assertTrue(getApplicationFile(Path.fromString("vespa-services.xml")).exists());
        assertTrue(getApplicationFile(Path.fromString("searchdefinitions")).exists());
        assertTrue(getApplicationFile(Path.fromString("searchdefinitions/sock.sd")).exists());
        assertFalse(getApplicationFile(Path.fromString("doesnotexist")).exists());
    }