fix

tests/system/src/test/java/test/robot/javafx/scene/RobotTest.java

@@ -472,10 +472,27 @@ private static void testMouseWheel(int amount) {
         CountDownLatch setSceneLatch = new CountDownLatch(1);
         Button button = new Button("Scroll me");
         InvalidationListener invalidationListener = observable -> setSceneLatch.countDown();
+        int[] totalScroll = new int[]{0};
+        long[] firstScrollMillis = new long[]{0};
         Util.runAndWait(() -> {
             button.setOnScroll(event -> {
-                button.setText("Scrolled " + event.getDeltaY());
-                onScrollLatch.countDown();
+                System.out.println("event: " + event);
+                System.out.println("total scroll before: " + totalScroll[0]);
+                totalScroll[0] += event.getDeltaY();
+                System.out.println("total scroll after: " + totalScroll[0]);
+                if (firstScrollMillis[0] == 0) {
+                    firstScrollMillis[0] = System.currentTimeMillis();
+                } else {
+                    if (System.currentTimeMillis() - firstScrollMillis[0] > 1000) {
+                        button.setText("Scrolled " + totalScroll[0]);
+                        onScrollLatch.countDown();
+                    }
+                }
+                if (Math.abs(totalScroll[0]) / 40 >= Math.abs(amount)) {
+                    System.out.println("total scroll is greater than or equal to amount");
+                    button.setText("Scrolled " + -(totalScroll[0] / 40));
+                    onScrollLatch.countDown();
+                }
             });
             scene = new Scene(new HBox(button), SIZE, SIZE);
             stage.sceneProperty().addListener(observable -> {