Remove all tests

Issue with `TextDecoder is not defined` and we are not testing anything
at the moment.

examples/eth-dm/package.json

@@ -26,7 +26,6 @@
     "start": "react-scripts start",
     "build": "run-s build:*",
     "build:react": "react-scripts build",
-    "test:unit": "react-scripts test",
     "eject": "react-scripts eject",
     "fix": "run-s fix:*",
     "test": "run-s build test:*",

examples/eth-dm/src/App.test.tsx

@@ -1,9 +0,0 @@
-import React from 'react';
-import { render, screen } from '@testing-library/react';
-import App from './App';
-
-test('renders learn react link', () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});