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In C++, you'd import the header file for that message like so:

#include "package_name/msg_name.h"

So in your case: #include "test/testmessage.h"

From Writing Publisher C++ code explained:

#include "std_msgs/String.h"

This includes the std_msgs/String message, which resides in the std_msgs package. This is a header generated automatically from the String.msg file in that package.

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