// Then
        assertNotNull(result);
        assertTrue(result.length > 0, "HMAC-T64 should produce non-empty result");
    }

    @Test
    @DisplayName("Should perform RC4 encryption/decryption")
    void testRC4() throws Exception {
        // Given
        byte[] key = "testkey123456789".getBytes(); // 16 bytes
        byte[] plaintext = "This is a test message for RC4".getBytes();

        // When

    }

    @Test
    @DisplayName("Test managed resource prevents use after close")
    void testManagedResourceUseAfterClose() throws Exception {
        TestResource resource = new TestResource("test4");
        ResourceManager.ManagedResource<TestResource> managed = resourceManager.manage(resource);

        managed.close();
        assertTrue(resource.isClosed());