Actually use the improved error message.

Author: sebastianbergmann

PHPUnit/Util/Fileloader.php

@@ -80,7 +80,9 @@ public static function checkAndLoad($filename, $syntaxCheck = FALSE)
         }
 
         if (!is_readable($filename)) {
-            throw PHPUnit_Util_InvalidArgumentHelper::factory(1, 'existing file');
+            throw new RuntimeException(
+              sprintf('Cannot open file "%s".' . "\n", $filename)
+            );
         }
 
         if ($syntaxCheck) {
@@ -99,19 +101,11 @@ public static function checkAndLoad($filename, $syntaxCheck = FALSE)
      */
     public static function load($filename)
     {
-        $_filename = PHPUnit_Util_Filesystem::fileExistsInIncludePath(
+        $filename = PHPUnit_Util_Filesystem::fileExistsInIncludePath(
           $filename
         );
 
-        if (!$_filename) {
-            throw new RuntimeException(
-              sprintf('Cannot open file "%s".' . "\n", $filename)
-            );
-        }
-
-        $filename         = $_filename;
         $oldVariableNames = array_keys(get_defined_vars());
-        unset($_filename);
 
         include_once $filename;