blakeblackshear.frigate/web/src/__tests__/AppBar.test.jsx

import { h } from 'preact';
import * as Context from '../context';
import AppBar from '../AppBar';
import { fireEvent, render, screen } from 'testing-library';

describe('AppBar', () => {
  beforeEach(() => {
    jest.spyOn(Context, 'useDarkMode').mockImplementation(() => ({
      setDarkMode: jest.fn(),
    }));
    jest.spyOn(Context, 'DarkModeProvider').mockImplementation(({ children }) => {
      return <div>{children}</div>;
    });
  });

  test('shows a menu on overflow click', async () => {
    render(
      <Context.DarkModeProvider>
        <Context.DrawerProvider>
          <AppBar />
        </Context.DrawerProvider>
      </Context.DarkModeProvider>
    );

    const overflowButton = await screen.findByLabelText('More options');
    fireEvent.click(overflowButton);

    const menu = await screen.findByRole('listbox');
    expect(menu).toBeInTheDocument();
  });

  test('sets dark mode on MenuItem select', async () => {
    const setDarkModeSpy = jest.fn();
    jest.spyOn(Context, 'useDarkMode').mockImplementation(() => ({
      setDarkMode: setDarkModeSpy,
    }));
    render(
      <Context.DarkModeProvider>
        <Context.DrawerProvider>
          <AppBar />
        </Context.DrawerProvider>
      </Context.DarkModeProvider>
    );

    const overflowButton = await screen.findByLabelText('More options');
    fireEvent.click(overflowButton);

    await screen.findByRole('listbox');

    fireEvent.click(screen.getByText('Light'));
    expect(setDarkModeSpy).toHaveBeenCalledWith('light');
  });
});