diff -u b/tests/Drupal/pgn/Tests/PgnEncoderUnitTest.php b/tests/Drupal/pgn/Tests/PgnEncoderUnitTest.php
--- b/tests/Drupal/pgn/Tests/PgnEncoderUnitTest.php
+++ b/tests/Drupal/pgn/Tests/PgnEncoderUnitTest.php
@@ -17,10 +17,6 @@
 
   protected static $encoder;
 
-  protected static $files = array('e4f5Dh5.pgn', 'fools_mate.pgn', 'e4g5Df3f5Dh5.pgn');
-
-  protected static $pgn_data_files;
-
   /**
    * {@inheritdoc}
    */
@@ -44,34 +40,28 @@
   /**
    * @dataProvider testMoveListEncodeProvider
    */
-  public function testMoveListEncode($normalized, $pgn) {
+  public function testMoveListEncode($normalized, $file) {
     $encoded = self::$encoder->encode($normalized, 'pgn_move_list');
 
-    $this->assertEquals($pgn, $encoded);
+    $module_directory_path = dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)));
+    $this->assertEquals(file_get_contents($module_directory_path . '/tests/' . $file), $encoded);
   }
 
   public function testMoveListEncodeProvider() {
-    $module_directory_path = dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)));
-    foreach (self::$files as $file) {
-      if (!isset(self::$pgn_data_files[$file])) {
-        self::$pgn_data_files[$file] = file_get_contents($module_directory_path . '/tests/' . $file);
-      }
-    }
-
     return array(
       array(
         array(
           1=> array('e4', 'f5'),
           2 => array('Qh5+'),
         ),
-        self::$pgn_data_files['e4f5Dh5.pgn'],
+        'e4f5Dh5.pgn',
       ),
       array(
         array(
           1 => array('f3', 'e5'),
           2 => array('g4', 'Dh4#'),
         ),
-        self::$pgn_data_files['fools_mate.pgn'],
+        'fools_mate.pgn',
       ),
       array(
         array(
@@ -79,7 +69,7 @@
           2 => array('Qf3', 'f5'),
           3 => array('Qh5#'),
         ),
-        self::$pgn_data_files['e4g5Df3f5Dh5.pgn'],
+        'e4g5Df3f5Dh5.pgn',
       ),
     );
   }