Shinsuke Sugaya <******@****.***> 1755149504 +0900

        }, "Constructor should accept null delegate (though it would cause NPE on use)");
    }

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

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

        // Then