Hamcrest Matchers Working with collection problem

gistfile1.java

package my.system;

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

import org.hamcrest.FeatureMatcher;
import org.hamcrest.Matcher;
import org.junit.Test;

import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;

public class HamcrestMatcherGist {
    class SystemUser {
        private String name;
        private String nickName;
        
        public String getName() {
            return name;
        }
        
        public String getNickName() {
            return nickName;
        }
    }
    
    class SystemUserContainer {
        private List<SystemUser> userList;
        
        public List<SystemUser> getUserList() {
            return userList;
        }
    }
    
    static Matcher<SystemUser> withName(Matcher<String> nameMatcher) {
        return new FeatureMatcher<SystemUser, String>(nameMatcher, "name", "name") {
            @Override
            protected String featureValueOf(SystemUser actual) {
                return actual.getName();
            }
        };
    }
    
    static Matcher<SystemUserContainer> hasUserList(Matcher<Iterable<? extends SystemUser>> userListMatcher) {
        return new FeatureMatcher<HamcrestMatcherGist.SystemUserContainer, Iterable<? extends SystemUser>>
            (userListMatcher, "user list", "user list") {
            
            @Override
            protected Iterable<? extends SystemUser> featureValueOf(
                    SystemUserContainer actual) {
                return actual.getUserList();
            }
        };
    }
    
    @Test
    public void workingWithCollections() {
        SystemUserContainer userContainer = new SystemUserContainer();
        assertThat(userContainer, hasUserList(contains(withName(equalTo("Chuck")))));
        assertThat(userContainer, hasUserList(hasSize(1)));
    }
}