Add JUnit extension for tests

base/src/test/java/atlantafx/base/JavaFXTest.java

@@ -0,0 +1,18 @@
+package atlantafx.base;
+
+import javafx.application.Platform;
+import org.junit.jupiter.api.extension.BeforeAllCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+public class JavaFXTest implements BeforeAllCallback {
+
+    @Override
+    public void beforeAll(ExtensionContext context) {
+        try {
+            Platform.startup(() -> {
+            });
+        } catch (Throwable t) {
+            // https://bugs.openjdk.org/browse/JDK-8090933 (2013!)
+        }
+    }
+}

base/src/test/java/atlantafx/base/layout/DeckPaneTest.java

@@ -2,22 +2,17 @@ package atlantafx.base.layout;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import atlantafx.base.JavaFXTest;
 import java.util.function.Consumer;
-import javafx.application.Platform;
 import javafx.scene.Node;
 import javafx.scene.shape.Rectangle;
 import javafx.util.Duration;
-import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 
+@ExtendWith({JavaFXTest.class})
 public class DeckPaneTest {
 
-    @BeforeAll
-    public static void startup() {
-        Platform.startup(() -> {
-        });
-    }
-
     @Test
     public void testTopNodeOnNewlyCreatedDeck() {
         var emptyDeck = new DeckPane();

base/src/test/java/atlantafx/base/util/PasswordTextFormatterTest.java

@@ -3,19 +3,14 @@ package atlantafx.base.util;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNull;
 
-import javafx.application.Platform;
+import atlantafx.base.JavaFXTest;
 import javafx.scene.control.TextField;
-import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 
+@ExtendWith({JavaFXTest.class})
 public class PasswordTextFormatterTest {
 
-    @BeforeAll
-    public static void startup() {
-        Platform.startup(() -> {
-        });
-    }
-
     @Test
     public void testTextIsMaskedByDefault() {
         var field = new TextField();