Try karmatic! +test reorg

test/unit/index.test.js

@@ -0,0 +1,27 @@
+/* eslint-env jest */
+
+import { h, Component, render } from 'preact';
+import App from '../../src/components/app';
+
+describe('<App />', () => {
+  let scratch;
+  beforeEach(() => {
+    scratch = document.createElement('div');
+    document.body.appendChild(scratch);
+  });
+  afterEach(() => {
+    render(<span />, scratch, scratch.firstChild);
+    scratch.remove();
+  });
+
+  it('should render', () => {
+    let app;
+    render(<App ref={c => { app = c; }} />, scratch);
+
+    expect(app instanceof Component).toBe(true);
+
+    expect(scratch.innerHTML).toBe(
+      `<div id="app" class="app__1wROX"><div><h1>Select an image</h1><input type="file"></div></div>`
+    );
+  });
+});