Explicitly rewind in-memory streams before asserting contents

GridFS streams do not yet support seeking (PHPLIB-213), and HHVM requires a stream_seek() implementation in order to pass a non-negative offset to stream_get_contents().

tests/GridFS/BucketFunctionalTest.php

@@ -174,6 +174,7 @@ class BucketFunctionalTest extends FunctionalTestCase
         $id = $this->bucket->uploadFromStream('filename', $this->createStream($input));
         $destination = $this->createStream();
         $this->bucket->downloadToStream($id, $destination);
+        rewind($destination);
 
         $this->assertStreamContents($input, $destination);
     }
@@ -208,30 +209,37 @@ class BucketFunctionalTest extends FunctionalTestCase
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination);
+        rewind($destination);
         $this->assertStreamContents('baz', $destination);
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination, ['revision' => -3]);
+        rewind($destination);
         $this->assertStreamContents('foo', $destination);
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination, ['revision' => -2]);
+        rewind($destination);
         $this->assertStreamContents('bar', $destination);
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination, ['revision' => -1]);
+        rewind($destination);
         $this->assertStreamContents('baz', $destination);
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination, ['revision' => 0]);
+        rewind($destination);
         $this->assertStreamContents('foo', $destination);
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination, ['revision' => 1]);
+        rewind($destination);
         $this->assertStreamContents('bar', $destination);
 
         $destination = $this->createStream();
         $this->bucket->downloadToStreamByName('filename', $destination, ['revision' => 2]);
+        rewind($destination);
         $this->assertStreamContents('baz', $destination);
     }
 

tests/GridFS/FunctionalTestCase.php

@@ -38,7 +38,7 @@ abstract class FunctionalTestCase extends BaseFunctionalTestCase
     {
         $this->assertInternalType('resource', $stream);
         $this->assertSame('stream', get_resource_type($stream));
-        $this->assertEquals($expectedContents, stream_get_contents($stream, -1, 0));
+        $this->assertEquals($expectedContents, stream_get_contents($stream));
     }
 
     /**