private static final ImmutableList<String> LIST1 = ImmutableList.of("one", "two");
  private static final ImmutableList<String> LIST2 = ImmutableList.of("three");

  public void testDelegate() {
    assertEquals(LIST1, ImmutableList.copyOf(newDelegatingList(LIST1)));
    assertEquals(LIST1, ImmutableList.copyOf(newDelegatingListWithEquals(LIST1)));
  }

  public void testToString() {

    @Test
    @DisplayName("Constructor should store delegate reference")
    void testConstructorStoresDelegate() {
        // Given
        Configuration testDelegate = mock(Configuration.class);

        // When
        DelegatingConfiguration config = new DelegatingConfiguration(testDelegate);

        // Then
        assertNotNull(config, "Configuration should be created");
    }

    @Test