Add tests for classes in the Predis\Protocol\Text namespace.

This was the only namespace containing classes with no tests.

lib/Predis/Protocol/Text/ResponseMultiBulkStreamHandler.php

@@ -37,9 +37,9 @@ class ResponseMultiBulkStreamHandler implements ResponseHandlerInterface
     {
         $length = (int) $lengthString;
 
-        if ($length != $lengthString) {
+        if ("$length" != $lengthString) {
             Helpers::onCommunicationException(new ProtocolException(
-                $connection, "Cannot parse '$length' as data length"
+                $connection, "Cannot parse '$lengthString' as multi-bulk length"
             ));
         }