public Set<String> removeHiddenTopics(final Set<String> topicNames) {
    return topicNames.stream()
        .filter(t -> !isHidden(t))
        .collect(Collectors.toSet());
  }
@Test
  public void shouldRemoveAllHiddenTopics() {
    // Given
    final Set<String> topics = ImmutableSet.of(
        "prefix_name", "literal", "tt", "name1", "suffix", "p_suffix"
    );

    // When
    final Set<String> filteredTopics = internalTopics.removeHiddenTopics(topics);

    // Then
    assertThat(filteredTopics, is(ImmutableSet.of("tt", "name1", "suffix")));
  }