signal-desktop/ts/test-electron/scrollToBottom_test.ts

47 lines
1.1 KiB
TypeScript

// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import { assert } from 'chai';
import { scrollToBottom } from '../util/scrollToBottom';
describe('scrollToBottom', () => {
let sandbox: HTMLDivElement;
beforeEach(() => {
sandbox = document.createElement('div');
document.body.appendChild(sandbox);
});
afterEach(() => {
sandbox.remove();
});
it("sets the element's scrollTop to the element's scrollHeight", () => {
const el = document.createElement('div');
el.innerText = 'a'.repeat(50000);
Object.assign(el.style, {
height: '50px',
overflow: 'scroll',
whiteSpace: 'wrap',
width: '100px',
wordBreak: 'break-word',
});
sandbox.appendChild(el);
assert.strictEqual(
el.scrollTop,
0,
'Test is not set up correctly. Element is already scrolled'
);
assert.isAtLeast(
el.scrollHeight,
50,
'Test is not set up correctly. scrollHeight is too low'
);
scrollToBottom(el);
assert.isAtLeast(el.scrollTop, el.scrollHeight - 50);
});
});