@Test
public void testIsInstalled() {

  assertFalse(JulZlgBridge.isInstalled());
  
  JulZlgBridge.install(Zlg.nop());
  assertTrue(JulZlgBridge.isInstalled());
  
  JulZlgBridge.uninstall();
  assertFalse(JulZlgBridge.isInstalled());
}