How to capture constructor arguments while Mockito is mocking the constructed class. Not pleasant but it works.

House.java

class Dog {

    String name;

    public Dog(String name) {
        this.name = name;
    }

    public String bark() {
        return name + " says: Woof!";
    }
}

/**
* Constructing a new House adds a dog named "Fido".
*/
public class House {

    public Dog dog;

    public House() {
        this.dog = new Dog("Fido");
    }

    public String ringBell() {
        return dog.bark();
    }
}

HouseTest.java

public class HouseTest {

    @Test
    void tryCaptureMockedConstruct() {
        try (
                MockedConstruction<Dog> mocked = mockConstruction(Dog.class, (mock, context) -> {
                    String passedDogname = (String) context.arguments().get(0);
                    assertEquals("Fido", passedDogname);
                    when(mock.bark()).thenReturn("Kef kef kef!");
                })
        ) {
            House house = new House();
            assertThat(house.ringBell(), is("Kef kef kef!"));
        }
    }
    
    @Test
    void tryVerify() {
        MockedConstruction<Dog> mocked = mockConstruction(Dog.class, (mockedDog, context) -> {
            when(mockedDog.bark()).thenReturn("Yipyipyip!");
        });

        House house = new House();
        assertThat(house.ringBell(), is("Yipyipyip!"));
        Dog dog = mocked.constructed().get(0);
        verify(dog, times(2)).bark();

        mocked.close();
    }

}