```

O tí ṣẹ̀dá API èyí tí yóò:

* Gbà àwọn ìbéèrè HTTP ni àwọn _ipa ọ̀nà_ `/` àti `/items/{item_id}`.
* Èyí tí àwọn _ipa ọ̀nà_ (i.e. _paths_) méjèèjì gbà àwọn iṣẹ `GET` (a tun mọ si _àwọn ọna_ HTTP).
* Èyí tí _ipa ọ̀nà_  (i.e. _paths_) `/items/{item_id}` ní _àwọn ohun-ini ipa ọ̀nà_ tí ó yẹ kí ó jẹ́ `int` i.e. `ÒǸKÀ`.
* Èyí tí _ipa ọ̀nà_  (i.e. _paths_) `/items/{item_id}` ní àṣàyàn `str` _àwọn ohun-ini_ (i.e. _query parameter_) `q`.

    assertNull(map.get(null));
  }

  public void testAsMultimap() {
    ImmutableMap<String, Integer> map =
        ImmutableMap.of("one", 1, "won", 1, "two", 2, "too", 2, "three", 3);
    ImmutableSetMultimap<String, Integer> expected =
        ImmutableSetMultimap.of("one", 1, "won", 1, "two", 2, "too", 2, "three", 3);
    assertEquals(expected, map.asMultimap());
  }

  public void testAsMultimapWhenEmpty() {