Test that the theme callback is properly inherited.
function testThemeCallbackInheritance() {
theme_enable(array(
$this->admin_theme,
));
$this
->drupalGet('menu-test/theme-callback/use-admin-theme/inheritance');
$this
->assertText('Custom theme: seven. Actual theme: seven. Theme callback inheritance is being tested.', 'Theme callback inheritance correctly uses the administrative theme.');
$this
->assertRaw('seven/style.css', "The administrative theme's CSS appears on the page.");
}