assertNotNull(retrieved);
        assertEquals(customEngine, retrieved);
    }

    // Test multiple registrations of the same engine
    @Test
    public void test_multipleRegistrations() {
        testScriptEngine.register();
        testScriptEngine.register(); // Register again

        // Should still work without errors

        assertFalse(mockService.processHeartbeat("non-existent", 1));

        // Clean up
        mockService.unregisterWitness(regId);
    }

    @Test
    void testMultipleRegistrations() {
        // Register multiple witnesses
        String reg1 = mockService.registerWitness("\\\\server1\\share1", "192.168.1.100", 1);