test: setup jest and everything

src/__test__/hello.test.tsx

@@ -0,0 +1,6 @@
+import { render, screen } from '@testing-library/react';
+
+test('hello', () => {
+  render(<div>hello</div>);
+  expect(screen.getByText('hello') as any).toBeInTheDocument();
+});

src/test-utils/setup-jest.ts

@@ -0,0 +1 @@
+import '@testing-library/jest-dom';