test/jdk/javax/swing/JFileChooser/EnterEmptyDirectory.java

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import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.UIManager;

/*
 * @test
 * @bug 4913368
 * @requires (os.family == "linux")
 * @summary Test repainting when entering an empty directory w/ GTK LAF
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual EnterEmptyDirectory
 */

public class EnterEmptyDirectory {

    private static final String INSTRUCTIONS = """
        This test is only for the GTK Look & Feel.

        Step 1:
        Find or create an empty directory. This directory should
        be in a directory with other files and directories, such that
        there are items in both the Folders and Files lists of the
        JFileChooser.

        Step 2:
        Click the "Show JFileChooser" button and enter the empty directory.
        If both lists are correctly repainted such that they are both empty
        (except for the ./ and ../) then the test passes.

        If the contents of the Folders or Files lists are unchanged, test FAILS. """;

    public static void main(String[] args) throws Exception {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
        PassFailJFrame.builder()
                .title("JFileChooser Instructions")
                .instructions(INSTRUCTIONS)
                .rows(15)
                .columns(40)
                .splitUI(EnterEmptyDirectory::createAndShowUI)
                .build()
                .awaitAndCheck();
    }

    public static JPanel createAndShowUI() {
        JButton button = new JButton("Show JFileChooser");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser jfc = new JFileChooser();
                jfc.setMultiSelectionEnabled(true);
                jfc.showOpenDialog(null);
            }
        });
        JPanel p = new JPanel();
        p.setLayout(new BorderLayout());
        p.setSize(200, 200);
        p.add(button);
        return p;
    }
}