@BeforeEach
    void setUp() {
        delegatingConfig = new DelegatingConfiguration(mockDelegate);
    }

    @Test
    @DisplayName("Constructor should require non-null delegate")
    void testConstructorWithNullDelegate() {
        // When & Then
        assertDoesNotThrow(() -> {
            new DelegatingConfiguration(null);
        }, "Constructor should accept null delegate (though it would cause NPE on use)");
    }