run npm install to generate a package lock

node_modules/@weborigami/async-tree/test/drivers/DeferredTree.test.js

@@ -0,0 +1,22 @@
+import assert from "node:assert";
+import { describe, test } from "node:test";
+import DeferredTree from "../../src/drivers/DeferredTree.js";
+import { ObjectTree, Tree } from "../../src/internal.js";
+
+describe("DeferredTree", () => {
+  test("lazy-loads a treelike object", async () => {
+    const tree = new DeferredTree(async () => ({ a: 1, b: 2, c: 3 }));
+    assert.deepEqual(await Tree.plain(tree), { a: 1, b: 2, c: 3 });
+  });
+
+  test("sets parent on subtrees", async () => {
+    const object = {
+      a: 1,
+    };
+    const parent = new ObjectTree({});
+    const fixture = new DeferredTree(() => object);
+    fixture.parent = parent;
+    const tree = await fixture.tree();
+    assert.equal(tree.parent, parent);
+  });
+});