dfe-frontend/packages/components/header/header.test.js

DfE frontend contains the code you need to design DfE Branded services on top of the GOVUK Design System.

import Header from './header';

describe('DfE header()', () => {
  describe('Does not throw an error', () => {
    it('if no document exists', () => {
      Header();
    });
  });
});