public boolean isEnabled() {
        return enabled;
    }
@Test
    public void test_constructor_enabledDefaultBehavior() {
        ClientTpcConfig config = new ClientTpcConfig();
        assertFalse(config.isEnabled());

        System.setProperty("hazelcast.client.tpc.enabled", "true");
        config = new ClientTpcConfig();
        assertTrue(config.isEnabled());

        System.setProperty("hazelcast.client.tpc.enabled", "false");
        config = new ClientTpcConfig();
        assertFalse(config.isEnabled());
    }