40 lines
1.4 KiB
TypeScript
40 lines
1.4 KiB
TypeScript
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import assert from 'node:assert/strict';
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import { unicodeSlice } from '../../util/unicodeSlice';
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import { byteLength } from '../../Bytes';
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describe('unicodeSlice()', () => {
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function test(
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title: string,
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input: string,
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begin: number,
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end: number,
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expected: string,
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expectedSize: number
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): void {
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it(title, () => {
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const result = unicodeSlice(input, begin, end);
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assert.strictEqual(result, expected);
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assert.strictEqual(byteLength(result), expectedSize);
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});
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}
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test('one-byte chars', '123456', 2, 4, '34', 2);
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test('past max length', '123456', 0, 100, '123456', 6);
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test('end before start', '123456', 5, 1, '', 0);
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test('negative start', '123456', -5, 4, '1234', 4);
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test('negative end', '123456', 0, -5, '', 0);
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test('end at start', '123456', 3, 3, '', 0);
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test('multi-byte char', 'x€x', 1, 4, '€', 3);
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test('multi-byte char slice before end', '€', 1, 3, '', 0);
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test('multi-byte char slice after start', '€', 2, 4, '', 0);
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test('emoji', 'x👩👩👧👦x', 1, 26, '👩👩👧👦', 25);
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test('emoji slice before end', 'x👩👩👧👦x', 1, 25, '', 0);
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test('emoji slice after start', 'x👩👩👧👦x', 2, 26, '', 0);
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test('emoji slice capture around', 'x👩👩👧👦x', 0, 27, 'x👩👩👧👦x', 27);
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});
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