Add test for node mapping

src/main/java/net/minestom/server/event/EventNodeImpl.java

@@ -409,24 +409,24 @@ non-sealed class EventNodeImpl<T extends Event> implements EventNode<T> {
                 final Handle<E> handle = handlers.get(handler);
                 if (handle != null) handle.call(event);
             };
-            if (filterList.length == 1) {
-                final var firstFilter = filterList[0];
-                // Common case where there is only one filter
-                return event -> mapper.accept(firstFilter, event);
-            } else if (filterList.length == 2) {
-                final var firstFilter = filterList[0];
-                final var secondFilter = filterList[1];
-                return event -> {
-                    mapper.accept(firstFilter, event);
-                    mapper.accept(secondFilter, event);
+            // Specialize the consumer depending on the number of filters to avoid looping
+            return switch (filterList.length) {
+                case 1 -> event -> mapper.accept(filterList[0], event);
+                case 2 -> event -> {
+                    mapper.accept(filterList[0], event);
+                    mapper.accept(filterList[1], event);
                 };
-            } else {
-                return event -> {
+                case 3 -> event -> {
+                    mapper.accept(filterList[0], event);
+                    mapper.accept(filterList[1], event);
+                    mapper.accept(filterList[2], event);
+                };
+                default -> event -> {
                     for (var filter : filterList) {
                         mapper.accept(filter, event);
                     }
                 };
-            }
+            };
         }
 
         void callListener(@NotNull EventListener<E> listener, E event) {

src/test/java/event/EventNodeTest.java

@@ -190,4 +190,34 @@ public class EventNodeTest {
         node.call(new ItemTestEvent(ItemStack.of(Material.DIAMOND)));
         assertFalse(result.get());
     }
+
+    @Test
+    public void testMap() {
+        record ItemTestEvent(ItemStack item) implements ItemEvent {
+            @Override
+            public @NotNull ItemStack getItemStack() {
+                return item;
+            }
+        }
+
+        var item = ItemStack.of(Material.DIAMOND);
+        var node = EventNode.all("main");
+
+        AtomicBoolean result = new AtomicBoolean(false);
+        var itemNode = EventNode.type("item_node", EventFilter.ITEM);
+        itemNode.addListener(ItemTestEvent.class, event -> result.set(true));
+        assertDoesNotThrow(() -> node.map(itemNode, item));
+
+        node.call(new ItemTestEvent(item));
+        assertTrue(result.get());
+
+        result.set(false);
+        node.call(new ItemTestEvent(ItemStack.of(Material.GOLD_INGOT)));
+        assertFalse(result.get());
+
+        result.set(false);
+        node.unmap(item);
+        node.call(new ItemTestEvent(item));
+        assertFalse(result.get());
+    }
 }