AListUserAdaptor.java

package au.com.loftinspace;

import com.googlecode.instinct.marker.annotate.Subject;
import com.googlecode.instinct.marker.annotate.Mock;
import com.googlecode.instinct.marker.annotate.Specification;
import com.googlecode.instinct.marker.annotate.BeforeSpecification;
import static com.googlecode.instinct.expect.Expect.expect;
import com.googlecode.instinct.integrate.junit4.InstinctRunner;

import java.util.List;
import java.util.LinkedList;
import java.util.ArrayList;

import org.jmock.Expectations;
import org.junit.runner.RunWith;

@RunWith(InstinctRunner.class)
public class AListUserAdaptor {

    @Subject ListUserAdaptor listUserAdaptor;
    @Mock ListUser mockListUser;

    @BeforeSpecification
    public void setUp() {
        listUserAdaptor = new ListUserAdaptor();
        listUserAdaptor.setListUser(mockListUser);
    }

    @Specification
    public void shouldUseArrayListsOnListUser() {
        /*
        It might be expected that this would fail, but it does not. Type checking on the List happens at
        compile time. The runtime type of the list is not checked as aNonNull resolves to ANYTHING
         */
        expect.that(new Expectations() {{
            one(mockListUser).useAList(with(aNonNull(ArrayList.class)));
        }});
        listUserAdaptor.useAList();
    }

    private class ListUserAdaptor {
        public ListUserAdaptor(){}
        private ListUser listUser;

        public void setListUser(ListUser listUser) {
            this.listUser = listUser;
        }

        public void useAList() {
            listUser.useAList(new LinkedList());
        }
    }

    private class ListUser {
        public void useAList(List list) {}
    }
}