8280913: Create a regression test for JRootPane.setDefaultButton() method

Backport-of: 51b53a821bb3cfb962f80a637f5fb8cde988975a

Author: GoeLin

test/jdk/javax/swing/JRootPane/DefaultButtonTest.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.awt.Robot;
+import java.awt.event.KeyEvent;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+/*
+ * @test
+ * @key headful
+ * @bug 8280913
+ * @summary Check whether the default button is honored when <Enter> key is pressed.
+ * @run main DefaultButtonTest
+ */
+public class DefaultButtonTest {
+    private volatile boolean buttonPressed;
+    private JFrame frame;
+
+    public static void main(String[] s) throws Exception {
+        DefaultButtonTest test = new DefaultButtonTest();
+        test.runTest();
+    }
+
+    private static void setLookAndFeel(String lafName) {
+        try {
+            UIManager.setLookAndFeel(lafName);
+        } catch (UnsupportedLookAndFeelException ignored) {
+            System.out.println("Ignoring Unsupported L&F: " + lafName);
+        } catch (ClassNotFoundException | InstantiationException
+                | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void disposeFrame() {
+        if (frame != null) {
+            frame.dispose();
+            frame = null;
+        }
+    }
+
+    private void createUI() {
+        frame = new JFrame("Default Button Test");
+        JPanel panel = new JPanel();
+        panel.add(new JTextField("Text field"));
+        JButton button1 = new JButton("Default");
+        button1.addActionListener(e -> buttonPressed = true);
+        panel.add(button1);
+        panel.add(new JButton("Button2"));
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.add(panel);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.getRootPane().setDefaultButton(button1);
+        frame.setVisible(true);
+    }
+
+    public void runTest() throws Exception {
+        Robot robot = new Robot();
+        robot.setAutoDelay(100);
+        for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
+            try {
+                buttonPressed = false;
+                String lafName = laf.getClassName();
+                System.out.println("Testing L&F: " + lafName);
+                SwingUtilities.invokeAndWait(() -> {
+                    setLookAndFeel(lafName);
+                    createUI();
+                });
+                robot.waitForIdle();
+                robot.keyPress(KeyEvent.VK_ENTER);
+                robot.keyRelease(KeyEvent.VK_ENTER);
+                robot.waitForIdle();
+
+                if (buttonPressed) {
+                    System.out.println("Test Passed for L&F: " + lafName);
+                } else {
+                    throw new RuntimeException("Test Failed, Default Button not pressed for L&F: " + lafName);
+                }
+            } finally {
+                SwingUtilities.invokeAndWait(this::disposeFrame);
+            }
+        }
+    }
+}