### Question:
Objects { public static boolean isNull(Object value) { return value == null; }  static boolean isNull(Object value); static boolean isNotNull(Object value); static UnaryPredicate<Object> whereNull(); static UnaryPredicate<Object> whereNotNull(); static Mapper<Object, String> toStringValue(); static Mapper<T, String> toStringValueFor(@SuppressWarnings("unused") Class<T> targetClass);  }### Answer:
@Test public void returnsTrueIfSuppliedObjectIsNull() { assertThat(isNull(null), is(true)); }
@Test public void returnsFalseIfSuppliedObjectIsNotNull() { assertThat(isNull(new Object()), is(false)); }