Client,test: add test for demo protocol activation

src/bin_client/test/test_injection.sh

@@ -9,8 +9,17 @@ start_node 1
 
 sleep 2
 
+# autogenerated from the demo source
+protocol_version="Ps1ZDZdgRP4PFDkzmFpiYtE7gJHioavCMxC96i9zJsK6URwSXSJ"
+
 $admin_client inject protocol "$test_dir/demo"
 $admin_client list protocols
+$client activate protocol $protocol_version with fitness 1 and key dictator
+answ=$($client rpc call /blocks/head/protocol with {} 2>/dev/null)
+
+if ! grep "$protocol_version" <<< $answ ; then
+  exit 1
+fi
 
 echo
 echo End of test