Prepare for repo merge

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

test/unit-tests/utils/iterables-test.ts

@@ -0,0 +1,69 @@
+/*
+Copyright 2024 New Vector Ltd.
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { iterableDiff, iterableIntersection } from "../../src/utils/iterables";
+
+describe("iterables", () => {
+    describe("iterableIntersection", () => {
+        it("should return the intersection", () => {
+            const a = [1, 2, 3];
+            const b = [1, 2, 4]; // note diff
+            const result = iterableIntersection(a, b);
+            expect(result).toBeDefined();
+            expect(result).toHaveLength(2);
+            expect(result).toEqual([1, 2]);
+        });
+
+        it("should return an empty array on no matches", () => {
+            const a = [1, 2, 3];
+            const b = [4, 5, 6];
+            const result = iterableIntersection(a, b);
+            expect(result).toBeDefined();
+            expect(result).toHaveLength(0);
+        });
+    });
+
+    describe("iterableDiff", () => {
+        it("should see added from A->B", () => {
+            const a = [1, 2, 3];
+            const b = [1, 2, 3, 4];
+            const result = iterableDiff(a, b);
+            expect(result).toBeDefined();
+            expect(result.added).toBeDefined();
+            expect(result.removed).toBeDefined();
+            expect(result.added).toHaveLength(1);
+            expect(result.removed).toHaveLength(0);
+            expect(result.added).toEqual([4]);
+        });
+
+        it("should see removed from A->B", () => {
+            const a = [1, 2, 3];
+            const b = [1, 2];
+            const result = iterableDiff(a, b);
+            expect(result).toBeDefined();
+            expect(result.added).toBeDefined();
+            expect(result.removed).toBeDefined();
+            expect(result.added).toHaveLength(0);
+            expect(result.removed).toHaveLength(1);
+            expect(result.removed).toEqual([3]);
+        });
+
+        it("should see added and removed in the same set", () => {
+            const a = [1, 2, 3];
+            const b = [1, 2, 4]; // note diff
+            const result = iterableDiff(a, b);
+            expect(result).toBeDefined();
+            expect(result.added).toBeDefined();
+            expect(result.removed).toBeDefined();
+            expect(result.added).toHaveLength(1);
+            expect(result.removed).toHaveLength(1);
+            expect(result.added).toEqual([4]);
+            expect(result.removed).toEqual([3]);
+        });
+    });
+});