Tauri-demo first meaningful test

main.spec.ts

import './main';
import { mockIPC } from "@tauri-apps/api/mocks";

describe('main', () => {
  it('should set the greeting message inside the message element', async () => {
    document.body.innerHTML = `
      <form id="greet-form">
        <input id="greet-input" />
      </form>
      <div id="greet-msg"></div>
    `;
    window.dispatchEvent(new Event("DOMContentLoaded"));
    const name = 'John Doe';
    const greetInputEl = document.querySelector("#greet-input") as HTMLInputElement;
    const greetMsgEl = document.querySelector("#greet-msg");
    const greetForm = document.querySelector("#greet-form") as HTMLFormElement;
    greetInputEl.value = name;
    mockIPC((cmd, args) => {
      if(cmd === "greet") {
          return `Hello, ${args.name}! You've been greeted from Rust!`;
      }
    });
    greetForm.dispatchEvent(new Event("submit"));
    await new Promise((resolve) => setTimeout(resolve, 0));
    expect(greetMsgEl?.textContent).toBe(`Hello, ${name}! You've been greeted from Rust!`);
  });
});