public final void doesNotContainEntry(@Nullable Object key, @Nullable Object value) {
    checkNoNeedToDisplayBothValues("entrySet()")
        .that(checkNotNull(actual).entrySet())
        .doesNotContain(immutableEntry(key, value));
  }
@Test
  public void doesNotContainNullEntry() {
    Map<String, String> actual = Maps.newHashMap();
    actual.put(null, null);
    assertThat(actual).doesNotContainEntry("kurt", null);
    assertThat(actual).doesNotContainEntry(null, "kluever");
  }