fix double includes and constness

test/CMakeLists.txt

@@ -2,8 +2,6 @@ add_executable(unittest
   ${CMAKE_CURRENT_LIST_DIR}/TestShape.cpp
 )
 
-message("${CMAKE_CURRENT_LIST_DIR}/TestShape.cpp")
-
 target_link_libraries(unittest PUBLIC
   Shapes
   gtest_main

test/TestShape.cpp

@@ -1,4 +1,4 @@
-#include <gtest/gtest.hpp>
+#include <gtest/gtest.h>
 
 #include "Rectangle.hpp"
 #include "Triangle.hpp"