source: josm/test/org/openstreetmap/josm/testframework/MainMock.java@ 271

package org.openstreetmap.josm.testframework;

import java.awt.AWTEvent;
import java.awt.AWTException;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

import org.junit.Before;
import org.junit.BeforeClass;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.Preferences;
import org.openstreetmap.josm.data.projection.Epsg4326;
import org.openstreetmap.josm.gui.PleaseWaitDialog;

public class MainMock {

        private static JDialog lastPopup;

        @Before public void clearFoundPopup() {
                lastPopup = null;
        }
        
        @BeforeClass public static void mockMain() throws Exception {
                Main.pref = new Preferences(){
                        @Override protected void save() {}
                        @Override public void load() throws IOException {}
                        @Override public Collection<Bookmark> loadBookmarks() throws IOException {return Collections.emptyList();}
                        @Override public void saveBookmarks(Collection<Bookmark> bookmarks) throws IOException {}
                };
                Main.parent = new JFrame();
                Main.proj = new Epsg4326();
                Main.pleaseWaitDlg = new PleaseWaitDialog(Main.parent);
                Main.main = new Main(){};
        }

        @BeforeClass public static void startPopupKiller() throws AWTException {
                Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener(){
                        public void eventDispatched(AWTEvent event) {
                                if (event.getSource() instanceof JButton) {
                                        JButton b = (JButton)event.getSource();
                                        if (b.getParent().getParent() instanceof JOptionPane) {
                                                lastPopup = (JDialog)SwingUtilities.getRoot(b);
                                                b.doClick();
                                        }
                                }
            }
                }, AWTEvent.FOCUS_EVENT_MASK);
    }

        public void assertPopup() {
                waitForPopup();
                lastPopup = null;
        }

        public JDialog waitForPopup() {
            for (int i = 0; i < 100; ++i) {
                        if (lastPopup != null)
                                return lastPopup;
                        try {Thread.sleep(10);} catch (InterruptedException e) {}
                }
                throw new AssertionError("Expected Popup dialog");
    }
}