102 lines
3.1 KiB
TypeScript
102 lines
3.1 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { assert } from 'chai';
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import { difference, isEqual, remove, toggle } from '../../util/setUtil';
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describe('set utilities', () => {
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const original = new Set([1, 2, 3]);
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describe('isEqual', () => {
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it('returns false if the sets are different', () => {
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const sets = [
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new Set([1, 2, 3]),
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new Set([1, 2, 3, 4]),
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new Set([1, 2]),
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new Set([4, 5, 6]),
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];
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for (const a of sets) {
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for (const b of sets) {
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if (a !== b) {
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assert.isFalse(isEqual(a, b));
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}
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}
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}
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});
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it('returns true if both arguments are the same set', () => {
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const set = new Set([1, 2, 3]);
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assert.isTrue(isEqual(set, set));
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});
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it('returns true if the sets have the same values', () => {
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assert.isTrue(isEqual(new Set(), new Set()));
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assert.isTrue(isEqual(new Set([1, 2]), new Set([2, 1])));
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});
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});
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describe('remove', () => {
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it('accepts zero arguments, returning a new set', () => {
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const result = remove(original);
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assert.deepStrictEqual(result, original);
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assert.notStrictEqual(result, original);
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});
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it('accepts 1 argument, returning a new set', () => {
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const result = remove(original, 2);
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assert.deepStrictEqual(result, new Set([1, 3]));
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assert.deepStrictEqual(original, new Set([1, 2, 3]));
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});
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it('accepts multiple arguments, returning a new set', () => {
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const result = remove(original, 1, 2, 99);
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assert.deepStrictEqual(result, new Set([3]));
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assert.deepStrictEqual(original, new Set([1, 2, 3]));
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});
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});
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describe('toggle', () => {
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it('returns a clone if trying to remove an item that was never there', () => {
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const result = toggle(original, 99, false);
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assert.deepStrictEqual(result, new Set([1, 2, 3]));
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assert.notStrictEqual(result, original);
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});
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it('returns a clone if trying to add an item that was already there', () => {
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const result = toggle(original, 3, true);
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assert.deepStrictEqual(result, new Set([1, 2, 3]));
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assert.notStrictEqual(result, original);
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});
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it('can add an item to a set', () => {
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const result = toggle(original, 4, true);
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assert.deepStrictEqual(result, new Set([1, 2, 3, 4]));
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assert.deepStrictEqual(original, new Set([1, 2, 3]));
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});
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it('can remove an item from a set', () => {
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const result = toggle(original, 2, false);
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assert.deepStrictEqual(result, new Set([1, 3]));
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assert.deepStrictEqual(original, new Set([1, 2, 3]));
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});
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});
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describe('difference', () => {
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it('returns the difference of two sets', () => {
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assert.deepStrictEqual(
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difference(new Set(['a', 'b', 'c']), new Set(['a', 'b', 'c'])),
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new Set()
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);
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assert.deepStrictEqual(
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difference(new Set(['a', 'b', 'c']), new Set([])),
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new Set(['a', 'b', 'c'])
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);
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assert.deepStrictEqual(
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difference(new Set(['a', 'b', 'c']), new Set(['d'])),
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new Set(['a', 'b', 'c'])
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);
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});
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});
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});
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