test/jdk/java/awt/MenuItem/NullOrEmptyStringLabelTest.java

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import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/*
 * @test
 * @bug 4251036
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @summary MenuItem setLabel(null/"") behaves differently under Win32 and Solaris
 * @run main/manual NullOrEmptyStringLabelTest
 */

public class NullOrEmptyStringLabelTest {

    public static void main(String[] args) throws Exception {
        String INSTRUCTIONS = """
                The bug is reproducible under Win32 and Solaris.
                Setting 'null' and "" as a label of menu item
                should set blank label on all platforms according to the specification.
                But under Solaris setting "" as a label of menu item used to
                cause some garbage to be set as label.
                Under Win32 setting 'null' as a label used to result in
                throwing NullPointerException.

                If you see any of these things happen test fails otherwise
                it passes.""";

        PassFailJFrame.builder()
                .title("NullOrEmptyStringLabelTest")
                .instructions(INSTRUCTIONS)
                .rows((int) INSTRUCTIONS.lines().count() + 2)
                .columns(40)
                .testUI(NullOrEmptyStringLabelTest::createAndShowUI)
                .build()
                .awaitAndCheck();
    }

    private static Frame createAndShowUI() {
        Frame frame = new Frame("Null Or Empty String Label Test");
        Menu menu = new Menu("Menu");
        MenuItem mi = new MenuItem("Item");
        MenuBar mb = new MenuBar();
        Button button1 = new Button("Set MenuItem label to 'null'");
        Button button2 = new Button("Set MenuItem label to \"\"");
        Button button3 = new Button("Set MenuItem label to 'text'");
        button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ev) {
                System.out.println("Setting MenuItem label to null");
                mi.setLabel(null);
            }
        });
        button2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ev) {
                System.out.println("Setting MenuItem label to \"\"");
                mi.setLabel("");
            }
        });
        button3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ev) {
                System.out.println("Setting MenuItem label to 'text'");
                mi.setLabel("text");
            }
        });
        menu.add(mi);
        mb.add(menu);
        frame.add(button1, BorderLayout.NORTH);
        frame.add(button2, BorderLayout.CENTER);
        frame.add(button3, BorderLayout.SOUTH);
        frame.setMenuBar(mb);
        frame.setSize(200, 135);
        return frame;
    }
}