replicate reported error

tst/Data/FilesystemTest.php

@@ -178,4 +178,16 @@ class FilesystemTest extends TestCase
             $this->assertEquals($this->_model->readComments($dataid), array($comment['meta']['created'] => $comment), "comment of $dataid wasn't modified in the conversion");
         }
     }
+
+    public function testValueFileErrorHandling()
+    {
+        define('VALID', 'valid content');
+        foreach (array('purge_limiter', 'salt', 'traffic_limiter') as $namespace) {
+            file_put_contents($this->_invalidPath . DIRECTORY_SEPARATOR . $namespace . '.php', 'invalid content');
+            $model = new Filesystem(array('dir' => $this->_invalidPath));
+            $this->assertEquals($model->getValue($namespace), '', 'empty default value returned, invalid content ignored');
+            $this->assertTrue($model->setValue(VALID, $namespace), 'setting valid value');
+            $this->assertEquals($model->getValue($namespace), VALID, 'valid value returned');
+        }
+    }
 }