mock method with generic and extends in return type

Question

Is it possible to mock (with mockito) method with signature Set getCars() without supress warnings? i tried:

XXX cars = xxx         


        

Answer 1

Use the doReturn-when alternate stubbing syntax.

System under test:

public class MyClass {
  Set<? extends Number> getSet() {
    return new HashSet<Integer>();
  }
}

and the test case:

import static org.mockito.Mockito.*;

import java.util.HashSet;
import java.util.Set;

import org.junit.Test;

public class TestMyClass {
  @Test
  public void testGetSet() {
    final MyClass mockInstance = mock(MyClass.class);

    final Set<Integer> resultSet = new HashSet<Integer>();
    resultSet.add(1);
    resultSet.add(2);
    resultSet.add(3);

    doReturn(resultSet).when(mockInstance).getSet();

    System.out.println(mockInstance.getSet());
  }
}

No errors or warning suppression needed