public static MountTo to(final String target) {
        return new MountTo(checkNotNullOrEmpty(target, "Target should not be null"));
    }
@Test
    public void should_return_bad_request_for_nonexistence_file() throws Exception {
        server.mount(MOUNT_DIR, to("/dir"));

        assertThrows(HttpResponseException.class, () ->
                running(server, () -> helper.get(remoteUrl("/dir/unknown.response"))));
    }