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diff --git a/vendor/lsolesen/pel/test/GH21Test.php b/vendor/lsolesen/pel/test/GH21Test.php
new file mode 100644
index 000000000..fd577425d
--- /dev/null
+++ b/vendor/lsolesen/pel/test/GH21Test.php
@@ -0,0 +1,83 @@
+<?php
+/**
+ * PEL: PHP Exif Library.
+ * A library with support for reading and
+ * writing all Exif headers in JPEG and TIFF images using PHP.
+ *
+ * Copyright (C) 2004, 2006, 2007 Martin Geisler.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program in the file COPYING; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ */
+
+use lsolesen\pel\PelJpeg;
+
+class GH21Test extends \PHPUnit_Framework_TestCase
+{
+    protected $file;
+
+    function setUp()
+    {
+        $this->file = dirname(__FILE__) . '/images/gh-21-tmp.jpg';
+        $file = dirname(__FILE__) . '/images/gh-21.jpg';
+        copy($file, $this->file);
+    }
+
+    function tearDown()
+    {
+        unlink($this->file);
+    }
+
+    function testThisDoesNotWorkAsExpected()
+    {
+        $scale = 0.75;
+        $input_jpeg = new PelJpeg($this->file);
+
+        $original = ImageCreateFromString($input_jpeg->getBytes());
+        $original_w = ImagesX($original);
+        $original_h = ImagesY($original);
+
+        $scaled_w = $original_w * $scale;
+        $scaled_h = $original_h * $scale;
+
+        $scaled = ImageCreateTrueColor($scaled_w, $scaled_h);
+        ImageCopyResampled(
+            $scaled,
+            $original,
+            0,
+            0, /* dst (x,y) */
+            0,
+            0, /* src (x,y) */
+            $scaled_w,
+            $scaled_h,
+            $original_w,
+            $original_h
+        );
+
+        $output_jpeg = new PelJpeg($scaled);
+
+        $exif = $input_jpeg->getExif();
+
+        if ($exif !== null) {
+            $output_jpeg->setExif($exif);
+        }
+
+        file_put_contents($this->file, $output_jpeg->getBytes());
+
+        $jpeg = new PelJpeg($this->file);
+        $exifin = $jpeg->getExif();
+        $this->assertEquals($exif, $exifin);
+    }
+}