### Question:
ItemDefinitionStore { public ItemDefinition get(final String uuid) { return itemDefinitions.get(uuid); }  ItemDefinition get(final String uuid); void index(final String uuid,
                      final ItemDefinition itemDefinition); void clear(); void unIndex(final String uuid);  }### Answer:
@Test public void testGetWhenItReturnsNull() { assertNull(store.get("456")); }
@Test public void testGetWhenItDoesNotReturnNull() { assertNotNull(store.get(uuid)); assertEquals(itemDefinition, store.get(uuid)); }