element-web/test/components/views/elements/ProgressBar-test.tsx

/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

import React from "react";
import { act, render } from "@testing-library/react";

import ProgressBar from "../../../../src/components/views/elements/ProgressBar";

jest.useFakeTimers();

describe("<ProgressBar/>", () => {
    it("works when animated", () => {
        const { container, rerender } = render(<ProgressBar max={100} value={50} animated={true} />);
        const progress = container.querySelector<HTMLProgressElement>("progress")!;

        // The animation always starts from 0
        expect(progress.value).toBe(0);

        // Await the animation to conclude to our initial value of 50
        act(() => {
            jest.runAllTimers();
        });
        expect(progress.position).toBe(0.5);

        // Move the needle to 80%
        rerender(<ProgressBar max={100} value={80} animated={true} />);
        expect(progress.position).toBe(0.5);

        // Let the animaiton run a tiny bit, assert it has moved from where it was to where it needs to go
        act(() => {
            jest.advanceTimersByTime(150);
        });
        expect(progress.position).toBeGreaterThan(0.5);
        expect(progress.position).toBeLessThan(0.8);
    });

    it("works when not animated", () => {
        const { container, rerender } = render(<ProgressBar max={100} value={50} animated={false} />);
        const progress = container.querySelector<HTMLProgressElement>("progress")!;

        // Without animation all positional updates are immediate, not requiring timers to run
        expect(progress.position).toBe(0.5);
        rerender(<ProgressBar max={100} value={80} animated={false} />);
        expect(progress.position).toBe(0.8);
    });
});