feat: example component snapshot test

src/components/__tests__/Footer.js

@@ -0,0 +1,16 @@
+import React from 'react';
+import renderer from 'react-test-renderer';
+
+import Footer from '../Footer';
+
+describe('Footer', () => {
+  it('renders correctly', () => {
+    const pages = [
+      { displayName: 'One', url: '/one' },
+      { displayName: 'Two', url: '/two' },
+    ];
+    const tree = renderer.create(<Footer pages={[]} />).toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+});

src/components/__tests__/__snapshots__/Footer.js.snap

@@ -0,0 +1,32 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Footer renders correctly 1`] = `
+<footer
+  className="Footer"
+>
+  <div
+    className="u-container"
+  >
+    <div
+      className="Footer-left"
+    >
+      <a
+        className="logo Footer-logo"
+        href="/"
+      />
+      <div
+        className="Footer-copyright"
+      >
+        Copyright © 2020 New Relic Inc.
+      </div>
+    </div>
+    <nav
+      aria-label="Footer"
+      className="Footer-nav"
+      role="navigation"
+    >
+      <ul />
+    </nav>
+  </div>
+</footer>
+`;