Fix test

Author: marcotc

spec/support/spy_transport.rb

@@ -43,7 +43,7 @@ def initialize(*)
 
   def send_traces(data)
     encoded_data = data.map do |trace|
-      @helper_encoder.join([Datadog::Tracing::Transport::Traces::Encoder.encode_trace(@helper_encoder, trace)])
+      @helper_encoder.join([Datadog::Tracing::Transport::Traces::Encoder.encode_trace(@helper_encoder, trace, true)])
     end
 
     @helper_mutex.synchronize do