8282402: Create a regression test for JDK-4666101

Backport-of: 1581e3faa06358f192799b3a89718028c7f6a24b

test/jdk/javax/swing/JEditorPane/4666101/JEditorPaneNavigationTest.java

@@ -0,0 +1,197 @@
+/*
+ * Copyright (c) 2002, 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.Dimension;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.Toolkit;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import javax.imageio.ImageIO;
+import javax.swing.JEditorPane;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UIManager.LookAndFeelInfo;
+import javax.swing.UnsupportedLookAndFeelException;
+
+import static javax.swing.UIManager.getInstalledLookAndFeels;
+
+/*
+ * @test
+ * @key headful
+ * @bug 4666101
+ * @summary Verifies that in a JEditorPane, the down arrow is honoured after you
+            add text on a line preceding a blank line.
+ * @run main JEditorPaneNavigationTest
+ */
+public class JEditorPaneNavigationTest {
+
+    private static volatile int caretPos;
+    private static JEditorPane jep;
+    private static JFrame frame;
+    private static Robot robot;
+
+    public static void main(String[] args) throws Exception {
+        robot = new Robot();
+        robot.setAutoWaitForIdle(true);
+        robot.setAutoDelay(100);
+
+        List<String> lafs = Arrays.stream(getInstalledLookAndFeels())
+                                  .map(LookAndFeelInfo::getClassName)
+                                  .collect(Collectors.toList());
+        for (final String laf : lafs) {
+            try {
+                AtomicBoolean lafSetSuccess = new AtomicBoolean(false);
+                SwingUtilities.invokeAndWait(() -> {
+                    lafSetSuccess.set(setLookAndFeel(laf));
+                    if (lafSetSuccess.get()) {
+                        createUI();
+                    }
+                });
+                if (!lafSetSuccess.get()) {
+                    continue;
+                }
+                robot.waitForIdle();
+
+                AtomicReference<Point> pt = new AtomicReference<>();
+                SwingUtilities.invokeAndWait(() -> pt.set(jep.getLocationOnScreen()));
+                caretPos = 0;
+                final Point jEditorLoc = pt.get();
+
+                // Click on JEditorPane
+                robot.mouseMove(jEditorLoc.x + 50, jEditorLoc.y + 50);
+                robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+                robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+
+                keyType(KeyEvent.VK_ENTER);
+                keyType(KeyEvent.VK_ENTER);
+
+                typeSomeText();
+
+                keyType(KeyEvent.VK_UP);
+                keyType(KeyEvent.VK_UP);
+
+                typeSomeText();
+
+                keyType(KeyEvent.VK_DOWN);
+
+                System.out.println(" test1 caret pos = " + caretPos);
+
+                // Check whether the caret position is at the expected value 5
+                if (caretPos != 5) {
+                    captureScreen();
+                    throw new RuntimeException("Test Failed in " + laf
+                            + " expected initial caret position is 5, but actual is " + caretPos);
+                }
+
+                keyType(KeyEvent.VK_DOWN);
+
+                System.out.println(" test2 caret pos = " + caretPos);
+
+                // Check whether the caret position is at the expected value 10
+                if (caretPos != 10) {
+                    captureScreen();
+                    throw new RuntimeException("Test Failed in " + laf
+                            + " expected final caret position is 10, but actual is " + caretPos);
+                }
+
+                System.out.println("Test Passed in " + laf);
+
+            } finally {
+                SwingUtilities.invokeAndWait(JEditorPaneNavigationTest::disposeFrame);
+            }
+        }
+    }
+
+    private static void captureScreen() {
+        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+        try {
+            ImageIO.write(
+                    robot.createScreenCapture(new Rectangle(0, 0, screenSize.width, screenSize.height)),
+                    "png",
+                    new File("JEditorPaneNavigationTest.png")
+            );
+        } catch (IOException ignore) {
+        }
+    }
+
+    private static void typeSomeText() {
+        keyType(KeyEvent.VK_T);
+        keyType(KeyEvent.VK_E);
+        keyType(KeyEvent.VK_X);
+        keyType(KeyEvent.VK_T);
+    }
+
+    private static void keyType(int keyCode) {
+        robot.keyPress(keyCode);
+        robot.keyRelease(keyCode);
+    }
+
+
+    private static void createUI() {
+        frame = new JFrame();
+        jep = new JEditorPane();
+        jep.setPreferredSize(new Dimension(100, 100));
+        jep.addCaretListener(e -> caretPos = jep.getCaretPosition());
+        jep.setEditable(true);
+        JPanel panel = new JPanel();
+        panel.add(jep);
+        frame.add(panel);
+        frame.setLocationRelativeTo(null);
+        frame.setAlwaysOnTop(true);
+        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+    private static boolean setLookAndFeel(String lafName) {
+        try {
+            UIManager.setLookAndFeel(lafName);
+        } catch (UnsupportedLookAndFeelException ignored) {
+            System.out.println("Ignoring Unsupported laf : " + lafName);
+            return false;
+        } catch (ClassNotFoundException | InstantiationException
+                | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+        return true;
+    }
+
+    private static void disposeFrame() {
+        if (frame != null) {
+            frame.dispose();
+            frame = null;
+        }
+    }
+
+}