add WindowContent tests

Author: arturbien

src/components/WindowContent/WindowContent.spec.js

@@ -0,0 +1,24 @@
+import React from 'react';
+
+import { renderWithTheme } from '../../../test/utils';
+
+import WindowContent from './WindowContent';
+
+describe('<WindowContent />', () => {
+  it('renders WindowContent', () => {
+    const { container } = renderWithTheme(<WindowContent />);
+    const windowContent = container.firstChild;
+
+    expect(windowContent).toBeInTheDocument();
+  });
+
+  it('renders children', () => {
+    const textContent = 'Hi there!';
+    const { getByText } = renderWithTheme(
+      <WindowContent>
+        <span>{textContent}</span>
+      </WindowContent>
+    );
+    expect(getByText(textContent)).toBeInTheDocument();
+  });
+});