element-web/test/utils/iterables-test.ts
David Langley 491f0cd08a
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2024-09-09 13:57:16 +00:00

69 lines
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TypeScript

/*
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]);
});
});
});