### Question:
ObjectProviderUtils { public static <T> ObjectProvider<T> nullValue() { return new NullProvider<T>(); } private  ObjectProviderUtils(); static ObjectProvider<T> bean(Class<T> beanClass); static ObjectProvider<T> cloning(T prototype); static ObjectProvider<T> constant(T value); static ObjectProvider<T> nullValue(); static ObjectProvider<T> singleton(ObjectProvider<T> inner);  }### Answer:
@Test public void testNullValue() throws Exception { assertTrue(ObjectProviderUtils.nullValue() instanceof NullProvider); }