Refactor tests.

Add tests for custom title bars.
Fix issue where the JRootPane.hideTitlePane option had no effect on macOS.

.github/workflows/codeql-analysis.yml

@@ -84,8 +84,13 @@ jobs:
     # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
     #    and modify them (or add more) to build your code if your project
     #    uses a compiled language
-    - run: |
+    - name: Build
-       ./gradlew build -PskipAutostyle
+      uses: eskatos/gradle-command-action@v1
+      with:
+        arguments: build -PskipAutostyle --info -x test
+        wrapper-cache-enabled: true
+        dependencies-cache-enabled: true
+        configuration-cache-enabled: true
 
     - name: Perform CodeQL Analysis
       uses: github/codeql-action/analyze@v1

.github/workflows/documentation.yml

@@ -46,7 +46,12 @@ jobs:
         with:
           java-version: 11
       - name: Build documentation
-        run: ./gradlew :darklaf-core:makeDocumentation -PskipAutostyle -x test
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: :darklaf-core:makeDocumentation -PskipAutostyle -x test
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true
       - name: Upload documentation
         uses: actions/upload-artifact@v1
         with:

.github/workflows/gradle.yml

@@ -38,17 +38,21 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 10
+          fetch-depth: 2
       - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
           java-version: 11
-      - name: Build
+      - name: Build & Test
-        run: ./gradlew build -PskipAutostyle --info -x test
+        uses: eskatos/gradle-command-action@v1
-      - name: Test
+        with:
-        run: ./gradlew test -PskipAutostyle --info
+          arguments: build test -PskipAutostyle --info --no-daemon
-      - name: Upload Results
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true
+      - name: Upload Test Results
         uses: actions/upload-artifact@v1
+        if: ${{ always() }}
         with:
           name: windows-test-results
           path: build/test_results
@@ -59,16 +63,20 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 10
+          fetch-depth: 2
       - name: Set up JDK 8
         uses: actions/setup-java@v1
         with:
           java-version: 8
-      - name: Build
+      - name: Build & Test
-        run: ./gradlew build -PskipAutostyle --info -x test
+        uses: eskatos/gradle-command-action@v1
-      - name: Test
+        with:
-        run: ./gradlew test -PskipAutostyle --info
+          arguments: build test -PskipAutostyle --info --no-daemon
-      - name: Upload Results
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true
+      - name: Upload Test Results
+        if: ${{ always() }}
         uses: actions/upload-artifact@v1
         with:
           name: linux-test-results
@@ -80,17 +88,21 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 10
+          fetch-depth: 2
       - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
           java-version: 11
-      - name: Build
+      - name: Build & Test
-        run: ./gradlew build -PskipAutostyle --info -x test
+        uses: eskatos/gradle-command-action@v1
-      - name: Test
+        with:
-        run: ./gradlew test -PskipAutostyle --info
+          arguments: build test -PskipAutostyle --info --no-daemon
-      - name: Upload Results
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true
+      - name: Upload Test Results
         uses: actions/upload-artifact@v1
+        if: ${{ always() }}
         with:
           name: macOS-test-results
           path: build/test_results

.github/workflows/libs.yml

@@ -51,7 +51,12 @@ jobs:
         with:
           java-version: 11
       - name: Build
-        run: ./gradlew :darklaf-windows:build -PskipAutostyle -x test
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: :darklaf-windows:build -PskipAutostyle -x test
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true
       - name: Upload x86 artifact
         uses: actions/upload-artifact@v1
         with:
@@ -75,7 +80,12 @@ jobs:
         with:
           java-version: 11
       - name: Build
-        run: ./gradlew :darklaf-macos:build -PskipAutostyle -x test
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: :darklaf-macos:build -PskipAutostyle -x test
+          wrapper-cache-enabled: true
+          dependencies-cache-enabled: true
+          configuration-cache-enabled: true
       - name: Upload artifact
         uses: actions/upload-artifact@v1
         with:

core/src/test/java/DemoLauncher.java

@@ -28,9 +28,13 @@ import ui.ComponentDemo;
 import ui.DemoPanel;
 import util.ClassFinder;
 
+import com.github.weisj.darklaf.util.ColorUtil;
+
 public class DemoLauncher implements ComponentDemo {
 
     public static void main(final String[] args) {
+        System.out.println(ColorUtil.getPerceivedBrightness(ColorUtil.fromHex("2D2D2D")));
+        if (true) return;
         ComponentDemo.showDemo(new DemoLauncher());
     }
 

core/src/test/java/test/AbstractImageTest.java

@@ -30,8 +30,9 @@ import java.nio.file.Files;
 import javax.imageio.ImageIO;
 
 import com.github.weisj.darklaf.util.ImageUtil;
+import com.github.weisj.darklaf.util.Scale;
 
-public abstract class AbstractImageTest {
+abstract class AbstractImageTest {
     private static final int SCALING_FACTOR = 3;
     protected static final String WORKING_DIR = "image_test";
     private final String workingDir;
@@ -69,4 +70,20 @@ public abstract class AbstractImageTest {
         }
         return null;
     }
+
+    protected BufferedImage saveWindowScreenShot(final String name, final Window w) {
+        try {
+            File file = new File(name + ".png");
+            file.getParentFile().mkdirs();
+            Robot robot = new Robot();
+            Point p = w.getLocationOnScreen();
+            BufferedImage image = robot.createScreenCapture(
+                    new Rectangle(p.x, p.y, Scale.scaleWidth(w.getWidth()), Scale.scaleHeight(w.getHeight())));
+            ImageIO.write(image, "png", file);
+            return image;
+        } catch (IOException | AWTException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
 }

core/src/test/java/test/CustomTitleBarTest.java

@@ -0,0 +1,226 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+ * associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+ * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+package test;
+
+import java.awt.*;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.image.BufferedImage;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
+
+import javax.swing.*;
+
+import org.junit.jupiter.api.*;
+import org.junit.jupiter.api.condition.EnabledOnOs;
+import org.junit.jupiter.api.condition.OS;
+
+import com.github.weisj.darklaf.LafManager;
+import com.github.weisj.darklaf.theme.DarculaTheme;
+import com.github.weisj.darklaf.theme.IntelliJTheme;
+import com.github.weisj.darklaf.ui.rootpane.DarkRootPaneUI;
+import com.github.weisj.darklaf.util.ColorUtil;
+import com.github.weisj.darklaf.util.SystemInfo;
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class CustomTitleBarTest extends AbstractImageTest {
+
+    private static final Color TITLE_BAR_COLOR = Color.RED;
+    private static final Color CONTENT_COLOR = Color.BLUE;
+    private static final int TITLE_BAR_Y = 10;
+    private static final int TOLERANCE = SystemInfo.isMac ? 55 : 0;
+
+    public CustomTitleBarTest() {
+        super("titlebar");
+    }
+
+    @BeforeAll
+    static void setup() {
+        LafManager.registerInitTask((t, d) -> {
+            d.put("MacOS.TitlePane.background", TITLE_BAR_COLOR);
+            d.put("MacOS.TitlePane.inactiveBackground", TITLE_BAR_COLOR);
+            d.put("Windows.TitlePane.background", TITLE_BAR_COLOR);
+            d.put("Windows.TitlePane.inactiveBackground", TITLE_BAR_COLOR);
+        });
+    }
+
+    @BeforeEach
+    void beforeEach() {
+        LafManager.setDecorationsEnabled(true);
+    }
+
+    private AtomicReference<JFrame> createFrame(final Consumer<JFrame> frameModifier) {
+        AtomicReference<JFrame> frame = new AtomicReference<>();
+        final Object lock = new Object();
+        TestUtils.runOnSwingThreadNotThrowing(() -> {
+            JFrame f = new JFrame("");
+            frame.set(f);
+            JPanel content = new JPanel();
+            content.setBackground(CONTENT_COLOR);
+            content.setPreferredSize(new Dimension(200, 200));
+            f.setContentPane(content);
+            f.pack();
+            f.setLocationRelativeTo(null);
+            f.addWindowListener(new WindowAdapter() {
+                @Override
+                public void windowOpened(final WindowEvent e) {
+                    f.removeWindowListener(this);
+                    SwingUtilities.invokeLater(() -> {
+                        synchronized (lock) {
+                            lock.notify();
+                        }
+                    });
+                }
+            });
+            f.setVisible(true);
+            frameModifier.accept(f);
+        });
+        synchronized (lock) {
+            try {
+                lock.wait(100000);
+                // Wait some time because the window may still be transparent.
+                Thread.sleep(500);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+                Thread.currentThread().interrupt();
+            }
+        }
+        return frame;
+    }
+
+    private boolean checkScreenColor(final Color expected, final Color value) {
+        return Math.abs(expected.getRed() - value.getRed()) <= CustomTitleBarTest.TOLERANCE
+                && Math.abs(expected.getGreen() - value.getGreen()) <= CustomTitleBarTest.TOLERANCE
+                && Math.abs(expected.getBlue() - value.getBlue()) <= CustomTitleBarTest.TOLERANCE;
+    }
+
+    private void assertScreenColorEquals(final Color expected, final Color value,
+            final String message) {
+        if (!checkScreenColor(expected, value)) {
+            String failureMessage = "Expected " + expected + ", but got " + value + ". Allowed tolerance is "
+                    + CustomTitleBarTest.TOLERANCE + ". " + message;
+            Assertions.fail(failureMessage);
+        }
+    }
+
+    private void assertScreenColorNotEquals(final Color expected, final Color value,
+            final String message) {
+        if (checkScreenColor(expected, value)) {
+            String failureMessage = "Did not expect " + expected + ", but got " + value + ". Allowed tolerance is "
+                    + CustomTitleBarTest.TOLERANCE + ". " + message;
+            Assertions.fail(failureMessage);
+        }
+    }
+
+    private void checkImage(final String fileName, final Consumer<BufferedImage> check) {
+        checkImage(fileName, f -> {
+        }, check);
+    }
+
+    private void checkImage(final String fileName, final Consumer<JFrame> frameModifier,
+            final Consumer<BufferedImage> check) {
+        AtomicReference<JFrame> frame = createFrame(frameModifier);
+        TestUtils.runOnSwingThreadNotThrowing(() -> {
+            Rectangle rect = frame.get().getBounds();
+            rect.setLocation(0, 0);
+            check.accept(saveWindowScreenShot(getPath(fileName), frame.get()));
+        });
+    }
+
+    @Test
+    @EnabledOnOs({OS.MAC, OS.WINDOWS})
+    void checkTitleBarColored() {
+        SwingUtilities.invokeLater(() -> LafManager.install(new IntelliJTheme()));
+        UIManager.put("macos.coloredTitleBar", true);
+        checkImage("colored_title_" + SystemInfo.getOsName(),
+                img -> assertScreenColorEquals(TITLE_BAR_COLOR, new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y)),
+                        "Title color not equal."));
+    }
+
+    @Test
+    @EnabledOnOs(OS.MAC)
+    void checkTitleBarNotColored() {
+        SwingUtilities.invokeLater(() -> LafManager.install(new IntelliJTheme()));
+        UIManager.put("macos.coloredTitleBar", false);
+        checkImage("non_colored_title_" + SystemInfo.getOsName(), img -> {
+            Color c = new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y));
+            assertScreenColorNotEquals(TITLE_BAR_COLOR, c, "Title is colored. Shouldn't be");
+            assertScreenColorNotEquals(CONTENT_COLOR, c, "No native titlebar is visible");
+        });
+    }
+
+    @Test
+    @EnabledOnOs(OS.MAC)
+    void checkForDarkNativeTitle() {
+        SwingUtilities.invokeLater(() -> LafManager.install(new DarculaTheme()));
+        UIManager.put("macos.coloredTitleBar", false);
+        checkImage("native_title_dark_mac", img -> {
+            assertScreenColorNotEquals(CONTENT_COLOR, new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y)),
+                    "No native titlebar is visible");
+            Color bg = new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y));
+            double brightness = ColorUtil.getPerceivedBrightness(bg);
+            Assertions.assertTrue(brightness < 80,
+                    "Titlebar is not dark. brightness = " + brightness + ". For color " + bg);
+        });
+    }
+
+    @Test
+    @EnabledOnOs(OS.MAC)
+    void checkForLightNativeTitle() {
+        SwingUtilities.invokeLater(() -> LafManager.install(new IntelliJTheme()));
+        UIManager.put("macos.coloredTitleBar", false);
+        checkImage("native_title_light_mac", img -> {
+            assertScreenColorNotEquals(CONTENT_COLOR, new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y)),
+                    "No native titlebar is visible");
+            Color bg = new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y));
+            double brightness = ColorUtil.getPerceivedBrightness(bg);
+            Assertions.assertTrue(brightness > 200,
+                    "Titlebar is not light. brightness = " + brightness + ". For color " + bg);
+        });
+    }
+
+    @Test
+    @EnabledOnOs({OS.MAC, OS.WINDOWS})
+    void checkTitleBarHidden() {
+        SwingUtilities.invokeLater(() -> LafManager.install(new IntelliJTheme()));
+        UIManager.put("macos.coloredTitleBar", true);
+        Assertions.assertTrue(LafManager.isDecorationsEnabled());
+        checkImage("title_bar_hidden_" + SystemInfo.getOsName(),
+                frame -> {
+                    JRootPane rootPane = frame.getRootPane();
+                    rootPane.putClientProperty(DarkRootPaneUI.HIDE_TITLEBAR, true);
+                },
+                img -> assertScreenColorEquals(CONTENT_COLOR, new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y)),
+                        "Titlebar isn't hidden"));
+    }
+
+    @Test
+    @EnabledOnOs(OS.WINDOWS)
+    void checkDisableCustomDecoration() {
+        SwingUtilities.invokeLater(() -> LafManager.install(new IntelliJTheme()));
+        checkImage("native_title_bar_window",
+                f -> LafManager.setDecorationsEnabled(false),
+                img -> assertScreenColorNotEquals(TITLE_BAR_COLOR,
+                        new Color(img.getRGB(img.getWidth() / 2, TITLE_BAR_Y)),
+                        "No native titlebar installed"));
+    }
+}

core/src/test/java/test/FontTest.java

@@ -42,7 +42,7 @@ import com.github.weisj.darklaf.LafManager;
 import com.github.weisj.darklaf.theme.IntelliJTheme;
 import com.github.weisj.darklaf.util.SystemInfo;
 
-public class FontTest extends AbstractImageTest {
+class FontTest extends AbstractImageTest {
 
     private static final Map<AttributedCharacterIterator.Attribute, Integer> kerning;
 
@@ -56,7 +56,7 @@ public class FontTest extends AbstractImageTest {
 
     @Test
     @EnabledOnOs({OS.MAC, OS.WINDOWS, OS.LINUX})
-    public void testFontChoices() {
+    void testFontChoices() {
         LafManager.install(new IntelliJTheme());
         JTextArea textArea = new JTextArea();
         textArea.setText(DemoResources.KERNING_TEST);

core/src/test/java/test/NativeLibraryTest.java

@@ -29,11 +29,11 @@ import org.junit.jupiter.api.condition.OS;
 import com.github.weisj.darklaf.platform.macos.MacOSLibrary;
 import com.github.weisj.darklaf.platform.windows.WindowsLibrary;
 
-public class NativeLibraryTest {
+class NativeLibraryTest {
 
     @Test
     @EnabledOnOs(OS.MAC)
-    public void testMacOSLibraryLoading() {
+    void testMacOSLibraryLoading() {
         MacOSLibrary library = new TestMacOsLibrary();
         Assertions.assertNotNull(getClass().getResource(library.getLibraryPath()), "macOS library doesn't exist");
         Assertions.assertDoesNotThrow(library::updateLibrary);
@@ -42,7 +42,7 @@ public class NativeLibraryTest {
 
     @Test
     @EnabledOnOs(OS.WINDOWS)
-    public void testWindowsLibraryLoading() {
+    void testWindowsLibraryLoading() {
         WindowsLibrary library = new TestWindowsLibrary();
         Assertions.assertNotNull(getClass().getResource(library.getX64Path() + library.getLibraryName()),
                 "x64 library doesn't exist");

core/src/test/java/test/TestUtils.java

@@ -0,0 +1,57 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+ * associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+ * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+package test;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.concurrent.atomic.AtomicReference;
+
+import javax.swing.*;
+
+import org.junit.jupiter.api.Assertions;
+
+class TestUtils {
+
+    private TestUtils() {}
+
+    static void runOnSwingThreadNotThrowing(final Runnable action) {
+        AtomicReference<Exception> exceptionRef = new AtomicReference<>();
+        try {
+            SwingUtilities.invokeAndWait(() -> {
+                try {
+                    action.run();
+                } catch (Exception e) {
+                    exceptionRef.set(e);
+                }
+            });
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            Assertions.fail(e.getMessage(), e);
+        } catch (InvocationTargetException e) {
+            e.getTargetException().printStackTrace();
+            Throwable target = e.getTargetException();
+            Assertions.fail(target.getMessage(), target);
+        }
+        if (exceptionRef.get() != null) {
+            Assertions.fail(exceptionRef.get().getMessage(), exceptionRef.get());
+        }
+    }
+}

core/src/test/java/test/TooltipTest.java

@@ -23,7 +23,6 @@ package test;
 
 import java.awt.*;
 import java.awt.image.BufferedImage;
-import java.util.concurrent.atomic.AtomicReference;
 
 import javax.swing.*;
 
@@ -40,7 +39,7 @@ import com.github.weisj.darklaf.ui.tooltip.ToolTipConstants;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.SystemInfo;
 
-public class TooltipTest extends AbstractImageTest {
+class TooltipTest extends AbstractImageTest {
 
     public TooltipTest() {
         super("tooltip");
@@ -63,7 +62,7 @@ public class TooltipTest extends AbstractImageTest {
 
     @Test
     @EnabledOnOs({OS.MAC, OS.WINDOWS})
-    public void testTooltipTransparency() throws Exception {
+    void testTooltipTransparency() throws Exception {
         JToolTip toolTip = createTooltip();
 
         SwingUtilities.invokeAndWait(() -> {
@@ -74,37 +73,28 @@ public class TooltipTest extends AbstractImageTest {
         Window window = DarkUIUtil.getWindow(toolTip);
         SwingUtilities.invokeAndWait(() -> window.setOpacity(1));
 
-        AtomicReference<Exception> exception = new AtomicReference<>();
+        TestUtils.runOnSwingThreadNotThrowing(() -> {
-
+            Component c;
-        SwingUtilities.invokeAndWait(() -> {
+            for (c = toolTip.getParent(); c != null; c = c.getParent()) {
-            try {
+                Color bg = c.getBackground();
-                Component c;
+                Assertions.assertNotNull(bg, "Background is null for " + c);
-                for (c = toolTip.getParent(); c != null; c = c.getParent()) {
+                Assertions.assertEquals(0, bg.getAlpha(), "Background " + bg + " is opaque " + c);
-                    Color bg = c.getBackground();
+                if (c instanceof Window) break;
-                    Assertions.assertNotNull(bg, "Background is null for " + c);
-                    Assertions.assertEquals(0, bg.getAlpha(), "Background " + bg + " is opaque " + c);
-                    if (c instanceof Window) break;
-                }
-                Assertions.assertEquals(c, window, "Did not traverse full hierarchy");
-
-                JRootPane rootPane = SwingUtilities.getRootPane(window);
-                Assertions.assertNotNull(rootPane, "RootPane is null");
-                Assertions.assertFalse(rootPane.isOpaque(), "RootPane is opaque");
-
-                Color backgroundColor = window.getBackground();
-                Assertions.assertNotNull(backgroundColor, "Background is null");
-
-                BufferedImage img = saveScreenShot(getPath("tooltip_" + SystemInfo.getOsName()), window);
-                Assertions.assertNotNull(img, "Tooltip Image is null");
-                int alpha = getAlpha(img.getRGB(img.getMinX(), img.getMinY() + img.getHeight() - 1));
-                Assertions.assertEquals(0, alpha, "Tooltip is opaque");
-            } catch (Exception e) {
-                exception.set(e);
             }
-        });
+            Assertions.assertEquals(c, window, "Did not traverse full hierarchy");
 
-        Exception e = exception.get();
+            JRootPane rootPane = SwingUtilities.getRootPane(window);
-        if (e != null) Assertions.fail(e.getMessage());
+            Assertions.assertNotNull(rootPane, "RootPane is null");
+            Assertions.assertFalse(rootPane.isOpaque(), "RootPane is opaque");
+
+            Color backgroundColor = window.getBackground();
+            Assertions.assertNotNull(backgroundColor, "Background is null");
+
+            BufferedImage img = saveScreenShot(getPath("tooltip_" + SystemInfo.getOsName()), window);
+            Assertions.assertNotNull(img, "Tooltip Image is null");
+            int alpha = getAlpha(img.getRGB(img.getMinX(), img.getMinY() + img.getHeight() - 1));
+            Assertions.assertEquals(0, alpha, "Tooltip is opaque");
+        });
     }
 
     private int getAlpha(final int rgb) {

macos/src/main/java/com/github/weisj/darklaf/platform/macos/ui/MacOSTitlePane.java

@@ -157,9 +157,9 @@ public class MacOSTitlePane extends CustomTitlePane {
             window.addWindowListener(windowListener);
             propertyChangeListener = new PropertyChangeHandler();
             window.addPropertyChangeListener(propertyChangeListener);
-            rootPanePropertyChangeListener = createRootPanePropertyChangeListener();
-            rootPane.addPropertyChangeListener(rootPanePropertyChangeListener);
         }
+        rootPanePropertyChangeListener = createRootPanePropertyChangeListener();
+        rootPane.addPropertyChangeListener(rootPanePropertyChangeListener);
     }
 
     private void uninstallListeners() {