/**
  * Test signing a blob
  */
 public function testGenerateSignatureBlob()
 {
     $credentials = new SharedAccessSignature('myaccount', 'WXuEUKMijV/pxUu5/RhDn1bYRuFlLSbmLUJJWRqYQ/uxbMpEx+7S/jo9sT3ZIkEucZGbEafDuxD1kwFOXf3xyw==', false);
     $result = $credentials->createSignature('pictures/blob.txt', 'b', 'r', '2009-08-14T11:03:40Z', '2009-08-14T11:53:40Z');
     $this->assertEquals('hk78uZGGWd8B2NYoBwKSPs5gen3xYqsd3DPO8BQhgTU=', $result);
 }