FocusTraversalTest.java

package psphistory;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import static junit.framework.Assert.assertEquals;
import junit.framework.TestCase;

/**
 * Test of MyFocusTraversalPolicy, MyKeyAdapter, & MyFocusListener
 *
 * @author jdalbey
 * @version 5/2/2017
 */
public class FocusTraversalTest extends TestCase implements ActionListener
{
    private boolean actionFlag; // was actionperformed called?

    public FocusTraversalTest(String testName)
    {
        super(testName);
    }

    @Override
    public void setUp()
    {
        actionFlag = false;
    }

    public void testMyFocusTraversalPolicy()
    {
        HistoryView hv = new HistoryView(null);
        HistoryView.MyFocusTraversalPolicy ftp = hv.new MyFocusTraversalPolicy();
        JLabel one = new JLabel();
        JLabel two = new JLabel();
        ftp.addComponent(one);
        ftp.addComponent(two);
        assertEquals(two, ftp.getComponentAfter(null, one));
        assertEquals(one, ftp.getComponentAfter(null, two));
        assertEquals(two, ftp.getComponentBefore(null, one));
        assertEquals(one, ftp.getComponentBefore(null, two));
        assertEquals(one, ftp.getDefaultComponent(null));
        assertEquals(one, ftp.getFirstComponent(null));
        assertEquals(two, ftp.getLastComponent(null));
    }

    public void testMyKeyAdapter()
    {
        HistoryView hv = new HistoryView(null);
        HistoryView.MyKeyAdapter ka = hv.new MyKeyAdapter();
        JTextField tf = new JTextField();
        KeyEvent evt = new KeyEvent(tf, 0, 0, 0, 0);
        ka.keyPressed(evt);
        assertEquals(Color.white, tf.getBackground());
    }

    public void testMyFocusListener()
    {
        HistoryView hv = new HistoryView(null);
        HistoryView.MyFocusListener fl = hv.new MyFocusListener();
        JButton btn = new JButton();
        JTextField tf = new JTextField();
        hv.btnNextPgm.addActionListener(this);
        FocusEvent evt = new FocusEvent(tf, FocusEvent.FOCUS_LOST, true, hv.btnNextPgm);
        fl.focusGained(null);
        fl.focusLost(evt);
        assertTrue(actionFlag);
        actionFlag = false;
        // these tests shouldn't trigger actionPerformed
        evt = new FocusEvent(tf, FocusEvent.FOCUS_LOST, true, btn);
        fl.focusLost(evt);
        evt = new FocusEvent(btn, FocusEvent.FOCUS_LOST, true, hv.btnNextPgm);
        fl.focusLost(evt);
        assertFalse(actionFlag);
    }

    @Override
    public void actionPerformed(ActionEvent ae)
    {
        actionFlag = true;
    }
}