JUnit Testing Exercise - map coverage

/*  Web-CAT tells us that the removeLocation() and removeStore() methods aren't covered.
    Write a JUnit test to accomplish this.
    The constructor() for Store is:
        public Store(String name, String address, String city)
*/
import java.util.*;
import java.io.*;
/**
 * Maps locations to stores
 *
 * @author Joe Student
 * @version 11/10/13
 */
public class LocationMap
{
    /** Internal map */
    private Map<String, Set<Store>> map;

    /**
     * Create new location map
     */
    public LocationMap()
    {
        map = new HashMap<String, Set<Store>>();
    }

    /**
     * Add a location to the map
     * @param location name of location
     */
    public void addLocation(String location)
    {
        map.put(location, new HashSet<Store>());
    }

    /**
     * Remove a location from map
     *
     * @param location Location to remove
     * @return Set Set of stores in location
     */
    public Set<Store> removeLocation(String location)
    {
        return map.remove(location);
    }

    /**
     * Gets stores in location
     *
     * @param location Name of location
     * @return Set Set of stores in location
     */
    public Set<Store> getStores(String location)
    {
        return map.get(location);
    }

    /**
     * Removes a store from the map
     *
     * @param store Store to remove
     */
    public void removeStore(Store store)
    {
        //remove each instance of the store
        for (Map.Entry<String, Set<Store>> pair : map.entrySet())
        {
            Set<Store> stores = pair.getValue();
            stores.remove(store);
        }
    }
}