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

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+import assert from "node:assert";
+import { describe, test } from "node:test";
+import SetTree from "../../src/drivers/SetTree.js";
+import { ObjectTree } from "../../src/internal.js";
+
+describe("SetTree", () => {
+  test("can get the keys of the tree", async () => {
+    const set = new Set(["a", "b", "c"]);
+    const fixture = new SetTree(set);
+    assert.deepEqual(Array.from(await fixture.keys()), [0, 1, 2]);
+  });
+
+  test("can get the value for a key", async () => {
+    const set = new Set(["a", "b", "c"]);
+    const fixture = new SetTree(set);
+    const a = await fixture.get(0);
+    assert.equal(a, "a");
+  });
+
+  test("getting an unsupported key returns undefined", async () => {
+    const set = new Set(["a", "b", "c"]);
+    const fixture = new SetTree(set);
+    assert.equal(await fixture.get(3), undefined);
+  });
+
+  test("getting a null/undefined key throws an exception", async () => {
+    const set = new Set(["a", "b", "c"]);
+    const fixture = new SetTree(set);
+    await assert.rejects(async () => {
+      await fixture.get(null);
+    });
+    await assert.rejects(async () => {
+      await fixture.get(undefined);
+    });
+  });
+
+  test("sets parent on subtrees", async () => {
+    const set = new Set();
+    set.add(new ObjectTree({}));
+    const fixture = new SetTree(set);
+    const subtree = await fixture.get(0);
+    assert.equal(subtree.parent, fixture);
+  });
+});