diff -ru tests/Test/Constraint/SameStringsConstraint.php tests/Test/Constraint/SameStringsConstraint.php
--- tests/Test/Constraint/SameStringsConstraint.php	2018-02-22 16:58:57.264975456 +0000
+++ tests/Test/Constraint/SameStringsConstraint.php	2018-02-22 16:58:58.220955499 +0000
@@ -36,8 +36,8 @@
 
         return ' #Warning: Strings contain different line endings! Debug using remapping ["\r" => "R", "\n" => "N", "\t" => "T"]:'
             ."\n"
-            .' -'.str_replace(["\r", "\n", "\t"], ['R', 'N', 'T'], $other)
+            .' -'.str_replace(array("\r", "\n", "\t"), array('R', 'N', 'T'), $other)
             ."\n"
-            .' +'.str_replace(["\r", "\n", "\t"], ['R', 'N', 'T'], $this->value);
+            .' +'.str_replace(array("\r", "\n", "\t"), array('R', 'N', 'T'), $this->value);
     }
 }
diff -ru tests/Test/Constraint/XmlMatchesXsdConstraint.php tests/Test/Constraint/XmlMatchesXsdConstraint.php
--- tests/Test/Constraint/XmlMatchesXsdConstraint.php	2018-02-22 16:58:57.530969903 +0000
+++ tests/Test/Constraint/XmlMatchesXsdConstraint.php	2018-02-22 16:58:58.043959194 +0000
@@ -28,7 +28,7 @@
     /**
      * @var string[]
      */
-    private $xmlConstraintErrors = [];
+    private $xmlConstraintErrors = array();
 
     /**
      * @var string