JUnit4: Assert that Object has not set attributes

Question

I am testing a method which should return an object of type Card. Something like:

@Test
public void testPrepareCardData() {   
   Card card = service.prepareData(ID);

After that I want to assert that all of the attributes of card have not been set. Let's say the method returned empty object. One way to do it (pretty naive) is to check every attribute, like:

assertNull(card.getId());
assertNull(card.getCardNumber());
etc.

But there is many attributes and it would take some time. Is there any sophisticated solution to that ?

Answer 1

You can use Reflection to perform that

Method[] methods = card.getClass().getDeclaredMethods();
for (Method method : methods) {
    if (method.getName().contains("get")) {
        method.setAccessible(true);
        // Act & Assert
        assertNull(method.invoke(card));
    }
}

More information: Reflection Oracle doc