Test that the theme system can generate output when called by hook_init().
function testThemeInitializationHookInit() {
$this
->drupalGet('theme-test/hook-init');
// Verify that themed output generated in hook_init() appears.
$this
->assertRaw('Themed output generated in hook_init()');
// Verify that the default theme's CSS still appears when the theme system
// is initialized in hook_init().
$this
->assertRaw('stark/css/layout.css');
}