init test and snapshot,

002_source/cms/src/__tests__/__snapshots__/snapshot.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders homepage unchanged 1`] = `
+<div>
+  <div
+    class="MuiBox-root css-0"
+  >
+    hello world!
+     
+    <div
+      class="MuiBox-root css-0"
+    >
+      <p
+        class="MuiTypography-root MuiTypography-body1 css-1kivl2a-MuiTypography-root"
+      >
+        inner component
+      </p>
+      <div
+        class="MuiListItemIcon-root css-cveggr-MuiListItemIcon-root"
+      />
+      <svg
+        fill="currentColor"
+        height="1em"
+        viewBox="0 0 256 256"
+        width="1em"
+        xmlns="http://www.w3.org/2000/svg"
+      >
+        <path
+          d="M216,48H176V40a24,24,0,0,0-24-24H104A24,24,0,0,0,80,40v8H40a8,8,0,0,0,0,16h8V208a16,16,0,0,0,16,16H192a16,16,0,0,0,16-16V64h8a8,8,0,0,0,0-16ZM96,40a8,8,0,0,1,8-8h48a8,8,0,0,1,8,8v8H96Zm96,168H64V64H192ZM112,104v64a8,8,0,0,1-16,0V104a8,8,0,0,1,16,0Zm48,0v64a8,8,0,0,1-16,0V104a8,8,0,0,1,16,0Z"
+        />
+      </svg>
+    </div>
+  </div>
+</div>
+`;

002_source/cms/src/__tests__/app/_helloworld/page.test.tsx

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+/// <reference types="jest" />
+import '@testing-library/jest-dom';
+import { render, screen } from '@testing-library/react';
+import Page from '@/app/_helloworld/page';
+
+// Mock the translation hook
+jest.mock('react-i18next', () => ({
+  useTranslation: () => ({
+    t: (key: string) => key,
+  }),
+}));
+
+describe('Page', () => {
+  it('renders a heading', () => {
+    render(<Page hello={'world'} />);
+
+    const heading = screen.getByRole('heading', { level: 1 });
+
+    expect(heading).toBeInTheDocument();
+  });
+});

002_source/cms/src/__tests__/snapshot.js

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+import { render } from '@testing-library/react';
+
+// CUT = Component Under Test
+import CUT from '../components/_helloworld';
+
+it('renders homepage unchanged', () => {
+  const { container } = render(<CUT />);
+  expect(container).toMatchSnapshot();
+});