@SuppressWarnings("ResultOfMethodCallIgnored")
@Test
public void containsKeyDelegates() {

    // given
    ChronicleMap<CharSequence, ItemSource> chronicleMap = createDefaultTestChronicleMap();
    CharSequence key = mock(CharSequence.class);
    ChronicleMapProxy proxy = createDefaultTestProxy(chronicleMap);
    // when
    proxy.containsKey(key);
    // then
    Mockito.verify(chronicleMap).containsKey(eq(key));
}