Confirms that default placeholders in paths work correctly.
public function testControllerPlaceholdersDefaultValues() {
$this
->drupalGet('router_test/test4');
$this
->assertRaw('narf', 'The correct string was returned because the route was successful.');
// Confirm that the page wrapping is being added, so we're not getting a
// raw body returned.
$this
->assertRaw('</html>', 'Page markup was found.');
// In some instances, the subrequest handling may get confused and render
// a page inception style. This test verifies that is not happening.
$this
->assertNoPattern('#</body>.*</body>#s', 'There was no double-page effect from a misrendered subrequest.');
}