Issue #2163003 by andypost: Node addition is broken when only one content type exists.

core/modules/node/lib/Drupal/node/Controller/NodeController.php

@@ -43,7 +43,7 @@ public function addPage() {
     // Bypass the node/add listing if only one content type is available.
     if (count($content) == 1) {
       $type = array_shift($content);
-      return $this->redirect('node_add', array('node_type' => $type->type));
+      return $this->redirect('node.add', array('node_type' => $type->type));
     }
 
     return array(

core/modules/node/lib/Drupal/node/Tests/NodeCreationTest.php

@@ -43,6 +43,11 @@ function setUp() {
    * Creates a "Basic page" node and verifies its consistency in the database.
    */
   function testNodeCreation() {
+    // Test /node/add page with only one content type.
+    entity_load('node_type', 'article')->delete();
+    $this->drupalGet('node/add');
+    $this->assertResponse(200);
+    $this->assertUrl('node/add/page');
     // Create a node.
     $edit = array();
     $edit['title[0][value]'] = $this->randomName(8);