IHF: array_to_xml helper tests added.

Author: dmitry-ivanov

tests/xml/ArrayToXmlTest.php

@@ -118,7 +118,7 @@ public function it_replaces_spaces_by_under_scores_in_key_names_by_default()
             ],
         ];
 
-        $expected = file_get_contents(__DIR__ . '/ArrayToXmlTest/with-spaces.xml');
+        $expected = file_get_contents(__DIR__ . '/ArrayToXmlTest/with-spaces-in-keys.xml');
 
         $this->assertEquals($expected, array_to_xml($array));
     }