Test: Ensure laf doesn't get installed multiple times.

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

@@ -36,8 +36,6 @@ import org.junit.jupiter.api.condition.OS;
 
 import com.github.weisj.darklaf.LafManager;
 import com.github.weisj.darklaf.color.ColorUtil;
-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.SystemInfo;
 
@@ -55,12 +53,13 @@ class CustomTitleBarTest extends AbstractImageTest {
 
     @BeforeAll
     static void setup() {
-        LafManager.registerInitTask((t, d) -> {
+        TestUtils.runOnSwingThreadNotThrowing(() -> 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);
-        });
+        }));
+        TestUtils.ensureLafInstalled();
     }
 
     @BeforeEach
@@ -155,7 +154,6 @@ class CustomTitleBarTest extends AbstractImageTest {
     @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)),
@@ -165,7 +163,6 @@ class CustomTitleBarTest extends AbstractImageTest {
     @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));
@@ -177,7 +174,6 @@ class CustomTitleBarTest extends AbstractImageTest {
     @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)),
@@ -192,7 +188,6 @@ class CustomTitleBarTest extends AbstractImageTest {
     @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)),
@@ -207,7 +202,6 @@ class CustomTitleBarTest extends AbstractImageTest {
     @Test
     @EnabledOnOs({OS.MAC, OS.WINDOWS})
     void checkTitleBarHidden() {
-        TestUtils.runOnSwingThreadNotThrowing(() -> LafManager.install(new IntelliJTheme()));
         UIManager.put("macos.coloredTitleBar", true);
         Assertions.assertTrue(LafManager.isDecorationsEnabled());
         checkImage("title_bar_hidden_" + SystemInfo.getOsName(),
@@ -222,7 +216,6 @@ class CustomTitleBarTest extends AbstractImageTest {
     @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,

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

@@ -32,14 +32,13 @@ import java.util.Map;
 import javax.swing.*;
 
 import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
 import ui.DemoResources;
 
-import com.github.weisj.darklaf.LafManager;
-import com.github.weisj.darklaf.theme.IntelliJTheme;
 import com.github.weisj.darklaf.util.SystemInfo;
 
 class FontTest extends AbstractImageTest {
@@ -54,10 +53,14 @@ class FontTest extends AbstractImageTest {
         super("font");
     }
 
+    @BeforeAll
+    static void setup() {
+        TestUtils.ensureLafInstalled();
+    }
+
     @Test
     @EnabledOnOs({OS.MAC, OS.WINDOWS, OS.LINUX})
     void testFontChoices() {
-        LafManager.install(new IntelliJTheme());
         JTextArea textArea = new JTextArea();
         textArea.setText(DemoResources.KERNING_TEST);
         textArea.setSize(textArea.getPreferredSize());

core/src/test/java/test/MemoryTest.java

@@ -54,7 +54,7 @@ class MemoryTest {
 
     @BeforeAll
     static void setupLaf() {
-        TestUtils.runOnSwingThreadNotThrowing(LafManager::install);
+        TestUtils.ensureLafInstalled();
     }
 
     @BeforeEach

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

@@ -26,12 +26,21 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import javax.swing.*;
 
+import com.github.weisj.darklaf.theme.IntelliJTheme;
 import org.junit.jupiter.api.Assertions;
 
+import com.github.weisj.darklaf.LafManager;
+
 final class TestUtils {
 
     private TestUtils() {}
 
+    static void ensureLafInstalled() {
+        if (!LafManager.isInstalled()) {
+            runOnSwingThreadNotThrowing(() -> LafManager.install(new IntelliJTheme()));
+        }
+    }
+
     static void runOnThreadNotThrowing(final Runnable action) {
         AtomicReference<Exception> exceptionRef = new AtomicReference<>();
         try {

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

@@ -33,8 +33,6 @@ import org.junit.jupiter.api.Test;
 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.IntelliJTheme;
 import com.github.weisj.darklaf.ui.DarkPopupFactory;
 import com.github.weisj.darklaf.ui.tooltip.ToolTipConstants;
 import com.github.weisj.darklaf.util.DarkUIUtil;
@@ -51,7 +49,7 @@ class TooltipTest extends AbstractImageTest {
 
     @BeforeAll
     static void setup() {
-        TestUtils.runOnSwingThreadNotThrowing(() -> LafManager.install(new IntelliJTheme()));
+        TestUtils.ensureLafInstalled();
     }
 
     private JToolTip createTooltip() {