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diff --git a/vendor/lsolesen/pel/test/DataWindowTest.php b/vendor/lsolesen/pel/test/DataWindowTest.php
new file mode 100644
index 000000000..5bb06e7d1
--- /dev/null
+++ b/vendor/lsolesen/pel/test/DataWindowTest.php
@@ -0,0 +1,140 @@
+<?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 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\PelDataWindow;
+use lsolesen\pel\PelConvert;
+use lsolesen\pel\PelDataWindowOffsetException;
+
+class DataWindowTest extends \PHPUnit_Framework_TestCase
+{
+
+    function testReadBytes()
+    {
+        $window = new PelDataWindow('abcdefgh');
+
+        $this->assertEquals($window->getSize(), 8);
+        $this->assertEquals($window->getBytes(), 'abcdefgh');
+
+        $this->assertEquals($window->getBytes(0), 'abcdefgh');
+        $this->assertEquals($window->getBytes(1), 'bcdefgh');
+        $this->assertEquals($window->getBytes(7), 'h');
+        // $this->assertEquals($window->getBytes(8), '');
+
+        $this->assertEquals($window->getBytes(- 1), 'h');
+        $this->assertEquals($window->getBytes(- 2), 'gh');
+        $this->assertEquals($window->getBytes(- 7), 'bcdefgh');
+        $this->assertEquals($window->getBytes(- 8), 'abcdefgh');
+
+        $clone = $window->getClone(2, 4);
+        $this->assertEquals($clone->getSize(), 4);
+        $this->assertEquals($clone->getBytes(), 'cdef');
+
+        $this->assertEquals($clone->getBytes(0), 'cdef');
+        $this->assertEquals($clone->getBytes(1), 'def');
+        $this->assertEquals($clone->getBytes(3), 'f');
+        // $this->assertEquals($clone->getBytes(4), '');
+
+        $this->assertEquals($clone->getBytes(- 1), 'f');
+        $this->assertEquals($clone->getBytes(- 2), 'ef');
+        $this->assertEquals($clone->getBytes(- 3), 'def');
+        $this->assertEquals($clone->getBytes(- 4), 'cdef');
+
+        $caught = false;
+        try {
+            $clone->getBytes(0, 6);
+        } catch (PelDataWindowOffsetException $e) {
+            $caught = true;
+        }
+        $this->assertTrue($caught);
+    }
+
+    function testReadIntegers()
+    {
+        $window = new PelDataWindow("\x01\x02\x03\x04", PelConvert::BIG_ENDIAN);
+
+        $this->assertEquals($window->getSize(), 4);
+        $this->assertEquals($window->getBytes(), "\x01\x02\x03\x04");
+
+        $this->assertEquals($window->getByte(0), 0x01);
+        $this->assertEquals($window->getByte(1), 0x02);
+        $this->assertEquals($window->getByte(2), 0x03);
+        $this->assertEquals($window->getByte(3), 0x04);
+
+        $this->assertEquals($window->getShort(0), 0x0102);
+        $this->assertEquals($window->getShort(1), 0x0203);
+        $this->assertEquals($window->getShort(2), 0x0304);
+
+        $this->assertEquals($window->getLong(0), 0x01020304);
+
+        $window->setByteOrder(PelConvert::LITTLE_ENDIAN);
+        $this->assertEquals($window->getSize(), 4);
+        $this->assertEquals($window->getBytes(), "\x01\x02\x03\x04");
+
+        $this->assertEquals($window->getByte(0), 0x01);
+        $this->assertEquals($window->getByte(1), 0x02);
+        $this->assertEquals($window->getByte(2), 0x03);
+        $this->assertEquals($window->getByte(3), 0x04);
+
+        $this->assertEquals($window->getShort(0), 0x0201);
+        $this->assertEquals($window->getShort(1), 0x0302);
+        $this->assertEquals($window->getShort(2), 0x0403);
+
+        $this->assertEquals($window->getLong(0), 0x04030201);
+    }
+
+    function testReadBigIntegers()
+    {
+        $window = new PelDataWindow("\x89\xAB\xCD\xEF", PelConvert::BIG_ENDIAN);
+
+        $this->assertEquals($window->getSize(), 4);
+        $this->assertEquals($window->getBytes(), "\x89\xAB\xCD\xEF");
+
+        $this->assertEquals($window->getByte(0), 0x89);
+        $this->assertEquals($window->getByte(1), 0xAB);
+        $this->assertEquals($window->getByte(2), 0xCD);
+        $this->assertEquals($window->getByte(3), 0xEF);
+
+        $this->assertEquals($window->getShort(0), 0x89AB);
+        $this->assertEquals($window->getShort(1), 0xABCD);
+        $this->assertEquals($window->getShort(2), 0xCDEF);
+
+        $this->assertEquals($window->getLong(0), 0x89ABCDEF);
+
+        $window->setByteOrder(PelConvert::LITTLE_ENDIAN);
+        $this->assertEquals($window->getSize(), 4);
+        $this->assertEquals($window->getBytes(), "\x89\xAB\xCD\xEF");
+
+        $this->assertEquals($window->getByte(0), 0x89);
+        $this->assertEquals($window->getByte(1), 0xAB);
+        $this->assertEquals($window->getByte(2), 0xCD);
+        $this->assertEquals($window->getByte(3), 0xEF);
+
+        $this->assertEquals($window->getShort(0), 0xAB89);
+        $this->assertEquals($window->getShort(1), 0xCDAB);
+        $this->assertEquals($window->getShort(2), 0xEFCD);
+
+        $this->assertEquals($window->getLong(0), 0xEFCDAB89);
+    }
+}