Ignoring only embedded member in AssertJ

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I have two classes to test with JUnit/Mockito:

 public class ClassA {

    private int sk;
    // getters and setters

} 


 public class ClassB {

    private int sk;
    private List<ClassA> lista;

    // getters and setters

} 

Then in my test class, using AssertJ:

   List<ClassA> lista = //... populated with list of objects of ClassA

   ClassB expected = new ClassB();
   expected.setSk(5);
   expected.setLista(lista);

   ClassB actual = getItFromTheClassToTest();   

   assertThat(actual).usingRecursiveComparison()
                    .ignoringFields("sk")  // need to ignore only classA.sk
                    .isEqualTo(expected);

The problem is that the name sk is in both classes, and I need to ignore it only in ClassA, not in ClassB. Is this possible in AssertJ?

Answer

According to the ignoringFields javadoc:

Nested fields can be specified like this: home.address.street.

…so with your classes:

ClassB b = new ClassB(1, Arrays.asList(new ClassA(1)));
ClassB bIsEqualsExceptForNestedField = new ClassB(1, Arrays.asList(new ClassA(2)));
ClassB bIsNotEquals = new ClassB(2, Arrays.asList(new ClassA(3)));

// should succeed
assertThat(b)
    .usingRecursiveComparison()
    .ignoringFields("lista.sk")
    .isEqualTo(bIsEqualsExceptForNestedField);
// should fail
assertThat(b)
    .usingRecursiveComparison()
    .ignoringFields("lista.sk")
    .isEqualTo(bIsNotEquals);


Source: stackoverflow