Test that the theme system can generate output when called by hook_init().
function testThemeInitializationHookInit() {
  $this
    ->drupalGet('theme-test/hook-init');
  $this
    ->assertRaw('Themed output generated in hook_init()', 'Themed output generated in hook_init() correctly appears on the page.');
  $this
    ->assertRaw('bartik/css/style.css', "The default theme's CSS appears on the page when the theme system is initialized in hook_init().");
}