Generate scaffolding with preact-cli default

tests/header.test.js

@@ -0,0 +1,12 @@
+import Header from '../src/components/header';
+import { Link } from 'preact-router/match';
+// See: https://github.com/mzgoddard/preact-render-spy
+import { shallow } from 'preact-render-spy';
+
+describe('Initial Test of the Header', () => {
+	test('Header renders 3 nav items', () => {
+		const context = shallow(<Header />);
+		expect(context.find('h1').text()).toBe('Preact App');
+		expect(context.find(<Link />).length).toBe(3);
+	});
+});