ui/tests/lib/components/MessageInput.svelte.test.js


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import { render, screen } from '@testing-library/svelte';
import userEvent from '@testing-library/user-event';
import { beforeEach, expect, test, describe, it, vi } from 'vitest';
import MessageInput from '$lib/components/MessageInput.svelte';

const user = userEvent.setup();

const mocks = vi.hoisted(() => ({
  sendMessage: vi.fn()
}));

describe('CreateChannelForm', async () => {
  beforeEach(async () => {
    render(MessageInput, {
      sendMessage: mocks.sendMessage
    });
  });

  describe('sends a message', async () => {
    it('with non-empty content', async () => {
      const input = screen.getByRole('textbox');
      await user.type(input, 'a happy surprise');

      const send = screen.getByRole('button');
      await user.click(send);

      expect(mocks.sendMessage).toHaveBeenCalledExactlyOnceWith('a happy surprise');
    });

    it('with empty content', async () => {
      const send = screen.getByRole('button');
      await user.click(send);

      expect(mocks.sendMessage).toHaveBeenCalledExactlyOnceWith('');
    });
  });
});