Update test/mcp/server/transports/streamable_http_transport_test.rb

Co-authored-by: Koichi ITO <[email protected]>

Author: siddhantbajaj

test/mcp/server/transports/streamable_http_transport_test.rb

@@ -618,8 +618,8 @@ class StreamableHTTPTransportTest < ActiveSupport::TestCase
 
           response = @transport.handle_request(notif_request)
           assert_equal 202, response[0]
-          assert_equal({}, response[1])
-          assert_equal [], response[2]
+          assert_empty(response[1])
+          assert_empty(response[2])
         end
 
         private