PIMathMatrix doc

tests/concurrent/testutil.h

@@ -3,6 +3,7 @@
 
 #include "pithread.h"
 #include <atomic>
+#include "pistring.h"
 
 /**
  * Minimum wait thread start, switch context or another interthread communication action time. Increase it if tests
@@ -57,4 +58,5 @@ public:
     }
 };
 
+
 #endif //AWRCANFLASHER_TESTUTIL_H