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 static org.hamcrest.core.IsInstanceOf.instanceOf;

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

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

@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() {
        /*
        This should fail and does, because the expected type (ArrayList) does not match the actual type
        (LinkedList) at runtime
         */
        expect.that(new Expectations() {
            {
                one(mockListUser).useAList(withAnInstanceOf(ArrayList.class));
            }

            private <T> T withAnInstanceOf(Class<T> aClass) {
                return with((Matcher<T>) instanceOf(aClass));
            }
        });
        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) {
        }
    }
}