package com.whatever;

public class Parent
{
    public void PlayWithChild(Child child)
    {
        child.Hug();
    }
}

package com.whatever.subpackage;

public class Child
{
    public void Hug()
    {
    }
}

package com.whatever;

import com.whatever.subpackage;

public class Test
{
    @Test
    public void PlayWithChild_ChildHugged()
    {
        //Arrange
        Child mckChild = Mockito.mock(Child.class);

        //Act
        new Parent(mckChild).PlayWithChild();

        //Assert
        Mockito.verify(mckChild).Hug();
    }
}