public final void doesNotContainEntry(@Nullable Object key, @Nullable Object value) {
    checkNoNeedToDisplayBothValues("entrySet()")
        .that(checkNotNull(actual).entrySet())
        .doesNotContain(immutableEntry(key, value));
  }
@Test
  public void doesNotContainNullEntryFailure() {
    Map<String, String> actual = Maps.newHashMap();
    actual.put(null, null);
    expectFailureWhenTestingThat(actual).doesNotContainEntry(null, null);
    assertFailureKeys("value of", "expected not to contain", "but was");
    assertFailureValue("value of", "map.entrySet()");
    assertFailureValue("expected not to contain", "null=null");
    assertFailureValue("but was", "[null=null]");
  }