Add test for retry wrapper

tests/RetryWrapper.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Copyright (c) 2014 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 PartialWrapper extends \Icewind\Streams\NullWrapper {
+	/**
+	 * Wraps a stream with the provided callbacks
+	 *
+	 * @param resource $source
+	 * @return resource
+	 *
+	 * @throws \BadMethodCallException
+	 */
+	public static function wrap($source) {
+		$context = stream_context_create(array(
+			'null' => array(
+				'source' => $source)
+		));
+		return self::wrapSource($source, $context, 'partial', '\Icewind\Streams\Tests\PartialWrapper');
+	}
+
+	public function stream_read($count) {
+		$count = min($count, 2); // return as most 2 bytes
+		return parent::stream_read($count);
+	}
+
+	public function stream_write($data) {
+		$data = substr($data, 0, 2); //write as most 2 bytes
+		return parent::stream_write($data);
+	}
+}
+
+class RetryWrapper extends Wrapper {
+
+	/**
+	 * @param resource $source
+	 * @return resource
+	 */
+	protected function wrapSource($source) {
+		return \Icewind\Streams\RetryWrapper::wrap(PartialWrapper::wrap($source));
+	}
+
+	public function testReadDir() {
+		$this->markTestSkipped('directories not supported');
+	}
+
+	public function testRewindDir() {
+		$this->markTestSkipped('directories not supported');
+	}
+}