@Test
  public void testRemove() {
    CopyOnWriteHashMap map = map5();
    map.remove(five);
    assertEquals(4, map.size());
    assertFalse(map.containsKey(five));
  }
remove removes the correct key-value pair from the map
geode-core/src/integrationTest/java/org/apache/geode/internal/util/concurrent/CopyOnWriteHashMapJUnitTest.java