add PathWrapper to get a virtual path for an existing file

tests/PathWrapper.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Copyright (c) 2016 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Licensed under the MIT license:
+ * http://opensource.org/licenses/MIT
+ */
+
+namespace Icewind\Streams\Tests;
+
+class PathWrapper extends \PHPUnit_Framework_TestCase {
+	private function getDataStream($data) {
+		$stream = fopen('php://temp', 'w+');
+		fwrite($stream, $data);
+		rewind($stream);
+		return $stream;
+	}
+
+	public function testFileGetContents() {
+		$data = 'foobar';
+		$stream = $this->getDataStream($data);
+		$path = \Icewind\Streams\PathWrapper::getPath($stream);
+		$this->assertEquals($data, file_get_contents($path));
+	}
+}