Implement initial snapshot tests for existing components

This commit implements the first snapshot tests for all existing
components. The snapshots approach has been chosen by purpose because
all components are in initial implementation state and actually only
render a React `<Fragment>`.

It also fixes the resulting problems with `propType` violations for the
`Landing` (index/root) page which renders the `Root` component without
passing children. This has been fixed by using a `React.Fragment`.

GH-39

src/pages/index.jsx

@@ -6,7 +6,7 @@
  * Repository: https://github.com/arcticicestudio/nord-docs
  * License:    MIT
  */
-import React from "react";
+import React, { Fragment } from "react";
 
 import Root from "containers/core/Root";
 
@@ -17,6 +17,10 @@ import Root from "containers/core/Root";
  * @author Sven Greb <[email protected]>
  * @since 0.1.0
  */
-const Landing = () => <Root />;
+const Landing = () => (
+  <Root>
+    <Fragment />
+  </Root>
+);
 
 export default Landing;

test/components/containers/core/Root/Root.test.jsx

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2018-present Arctic Ice Studio <[email protected]>
+ * Copyright (C) 2018-present Sven Greb <[email protected]>
+ *
+ * Project:    Nord Docs
+ * Repository: https://github.com/arcticicestudio/nord-docs
+ * License:    MIT
+ */
+
+import React, { Fragment } from "react";
+import { render } from "react-testing-library";
+
+import Root from "containers/core/Root";
+
+test("snapshot", () => {
+  const { container } = render(
+    <Root>
+      <Fragment />
+    </Root>
+  );
+  expect(container).toMatchSnapshot();
+});

test/components/containers/core/Root/__snapshots__/Root.test.jsx.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`snapshot 1`] = `<div />`;

test/pages/__snapshots__/index.test.jsx.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`snapshot 1`] = `<div />`;

test/pages/index.test.jsx

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2018-present Arctic Ice Studio <[email protected]>
+ * Copyright (C) 2018-present Sven Greb <[email protected]>
+ *
+ * Project:    Nord Docs
+ * Repository: https://github.com/arcticicestudio/nord-docs
+ * License:    MIT
+ */
+
+import React from "react";
+import { render } from "react-testing-library";
+
+import Landing from "pages";
+
+test("snapshot", () => {
+  const { container } = render(<Landing />);
+  expect(container).toMatchSnapshot();
+});