### Question:
Engine { public static Engine getEngine(String engineName) { Engine engine = ALL_ENGINES.get(engineName); if (engine == null) { throw new IllegalArgumentException("Deep learning engine not found: " + engineName); } return engine; }  abstract String getEngineName(); int getRank(); static Engine getInstance(); static boolean hasEngine(String engineName); static Set<String> getAllEngines(); static Engine getEngine(String engineName); abstract String getVersion(); abstract boolean hasCapability(String capability); abstract Model newModel(String name, Device device); abstract NDManager newBaseManager(); abstract NDManager newBaseManager(Device device); abstract GradientCollector newGradientCollector(); ParameterServer newParameterServer(Optimizer optimizer); abstract void setRandomSeed(int seed); void debugEnvironment();  }### Answer:
@Test public void testGetEngine() { Engine engine = Engine.getEngine("MockEngine"); Assert.assertNotNull(engine); }