86 lines
2 KiB
TypeScript
86 lines
2 KiB
TypeScript
// Copyright 2021-2022 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 {
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getScrollBottom,
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scrollToBottom,
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setScrollBottom,
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} from '../util/scrollUtil';
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describe('scroll utilities', () => {
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let sandbox: HTMLDivElement;
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let el: HTMLDivElement;
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// These tests to be flaky on Windows CI, sometimes timing out. That doesn't really
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// make sense because the test is synchronous, but this quick-and-dirty fix is
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// probably better than a full investigation.
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before(function thisNeeded() {
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if (process.platform === 'win32') {
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this.skip();
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}
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});
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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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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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});
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afterEach(() => {
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sandbox.remove();
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});
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describe('getScrollBottom', () => {
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it('gets the distance from the bottom', () => {
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assert.strictEqual(
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getScrollBottom(el),
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el.scrollHeight - el.clientHeight
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);
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el.scrollTop = 999999;
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assert.strictEqual(getScrollBottom(el), 0);
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});
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});
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describe('setScrollBottom', () => {
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it('sets the distance from the bottom', () => {
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setScrollBottom(el, 12);
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assert.strictEqual(getScrollBottom(el), 12);
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setScrollBottom(el, 9999999);
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assert.strictEqual(el.scrollTop, 0);
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});
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});
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describe('scrollToBottom', () => {
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it("sets the element's scrollTop to the element's scrollHeight", () => {
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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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});
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