Test that copy() works.

test/Tests/StreamWrapperTest.php

@@ -352,6 +352,11 @@ class StreamWrapperTest extends \HPCloud\Tests\TestCase {
 
     $contents = file_get_contents($url);
     $this->assertGreaterThan(5, strlen($contents));
+
+    $fsCopy = '/tmp/hpcloud-copy-test.txt';
+    copy($url, $fsCopy, $this->basicSwiftContext());
+    $this->assertTrue(file_exists($fsCopy));
+    unlink($fsCopy);
   }
 
   /**