source: class FastByIDMapTest  {
  
    @Test
    public void testClear() {
  
target:     FastByIDMap<Long> map = new FastByIDMap<>();
      map.put(500000L, 2L);
      map.clear();
      assertEquals(0, map.size());
      assertTrue(map.isEmpty());
      assertNull(map.get(500000L));
    }
  
  }