test: Add test for desync tree entity names

framework_crates/bones_ecs/tests/desync_tree.rs

@@ -0,0 +1,46 @@
+//! Tests for [`DesyncTree`] build that rely on types in [`bones_ecs`].
+
+use bones_ecs::prelude::*;
+
+#[derive(Clone, HasSchema, Debug, Eq, PartialEq, Default, DesyncHash)]
+#[net]
+#[repr(C)]
+struct Pos(i32, i32);
+
+#[test]
+fn desync_tree_entity_names() {
+    let world = World::default();
+
+    // Scope this so mut borrows are finished by time tree is being created.
+    let (ent1, ent2) = {
+        let mut entities = world.resource_mut::<Entities>();
+        let mut positions = world.component_mut::<Pos>();
+        let mut names = world.component_mut::<Name>();
+
+        let ent1 = entities.create();
+        positions.insert(ent1, Pos(0, 0));
+
+        let ent2 = entities.create();
+        positions.insert(ent2, Pos(1, 1));
+        names.insert(ent2, "entity2".into());
+        (ent1, ent2)
+    };
+
+    let mut found_ent1_metadata = false;
+    let mut found_ent2_metadata = false;
+
+    let desync_tree = world.desync_hash_tree::<fxhash::FxHasher>(false);
+    for node in desync_tree.root().dfs_preorder_iter() {
+        if let DesyncNodeMetadata::Component { entity_idx } = node.metadata() {
+            if *entity_idx == ent1.index() {
+                found_ent1_metadata = true;
+            } else if *entity_idx == ent2.index() {
+                found_ent2_metadata = true;
+                assert_eq!(*node.name(), Some("entity2".to_string()));
+            }
+        }
+    }
+
+    assert!(found_ent1_metadata);
+    assert!(found_ent2_metadata);
+}