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add diff-arrays utility for efficient array diffs

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Hazelnoot 2025-05-24 18:28:43 -04:00
parent 45e5749cca
commit 373c60b521
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53
packages/backend/test/unit/misc/diff-arrays.ts Normal file
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/*
* SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { diffArrays } from '@/misc/diff-arrays.js';
describe(diffArrays, () => {
it('should return empty result when both inputs are null', () => {
const result = diffArrays(null, null);
expect(result.added).toHaveLength(0);
expect(result.removed).toHaveLength(0);
});
it('should return empty result when both inputs are empty', () => {
const result = diffArrays([], []);
expect(result.added).toHaveLength(0);
expect(result.removed).toHaveLength(0);
});
it('should remove before when added is empty', () => {
const result = diffArrays([1, 2, 3], []);
expect(result.added).toHaveLength(0);
expect(result.removed).toEqual([1, 2, 3]);
});
it('should deduplicate before when added is empty', () => {
const result = diffArrays([1, 1, 2, 2, 3], []);
expect(result.added).toHaveLength(0);
expect(result.removed).toEqual([1, 2, 3]);
});
it('should remove after when before is empty', () => {
const result = diffArrays([], [1, 2, 3]);
expect(result.added).toEqual([1, 2, 3]);
expect(result.removed).toHaveLength(0);
});
it('should deduplicate after when before is empty', () => {
const result = diffArrays([], [1, 1, 2, 2, 3]);
expect(result.added).toEqual([1, 2, 3]);
expect(result.removed).toHaveLength(0);
});
it('should return diff when both have values', () => {
const result = diffArrays(
['a', 'b', 'c', 'd'],
['a', 'c', 'e', 'f'],
);
expect(result.added).toEqual(['e', 'f']);
expect(result.removed).toEqual(['b', 'd']);
});
});