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tests/header.test.js

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+import { h } from 'preact';
+import Header from '../src/components/header';
+// See: https://github.com/preactjs/enzyme-adapter-preact-pure
+import { shallow } from 'enzyme';
+
+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);
+	});
+});