48 lines
1.1 KiB
TypeScript
48 lines
1.1 KiB
TypeScript
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// 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 { scrollToBottom } from '../util/scrollToBottom';
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describe('scrollToBottom', () => {
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let sandbox: HTMLDivElement;
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beforeEach(() => {
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sandbox = document.createElement('div');
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document.body.appendChild(sandbox);
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});
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afterEach(() => {
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sandbox.remove();
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});
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it("sets the element's scrollTop to the element's scrollHeight", () => {
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const el = document.createElement('div');
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el.innerText = 'a'.repeat(50000);
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Object.assign(el.style, {
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height: '50px',
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overflow: 'scroll',
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whiteSpace: 'wrap',
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width: '100px',
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wordBreak: 'break-word',
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});
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sandbox.appendChild(el);
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assert.strictEqual(
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el.scrollTop,
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0,
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'Test is not set up correctly. Element is already scrolled'
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);
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assert.isAtLeast(
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el.scrollHeight,
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50,
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'Test is not set up correctly. scrollHeight is too low'
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);
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scrollToBottom(el);
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assert.isAtLeast(el.scrollTop, el.scrollHeight - 50);
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});
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});
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