Add test for #471

Author: jenssegers

tests/RelationsTest.php

@@ -50,6 +50,9 @@ public function testBelongsTo()
 
         $owner = $item->user;
         $this->assertEquals('John Doe', $owner->name);
+
+        $book = Book::create(['title' => 'A Clash of Kings']);
+        $this->assertEquals(null, $book->author);
     }
 
     public function testHasOne()

tests/config/database.php

@@ -7,13 +7,13 @@
 		'mongodb' => [
 			'name'	   => 'mongodb',
 			'driver'   => 'mongodb',
-			'host'     => 'localhost',
+			'host'     => '127.0.0.1',
 			'database' => 'unittest',
 		],
 
 		'mysql' => [
 			'driver'    => 'mysql',
-			'host'      => 'localhost',
+			'host'      => '127.0.0.1',
 			'database'  => 'unittest',
 			'username'  => 'travis',
 			'password'  => '',