Enable make test

CMakeLists.txt

 # project name and specify the minumum cmake version.
 project (psrdada_cpp CXX)
 cmake_minimum_required (VERSION 3.0)
+enable_testing()
 
 # The version number.
 set (psrdada_cpp_VERSION_MAJOR 0)
@@ -65,4 +66,4 @@ if (DEBUG_PRINT)
     message(STATUS "  Other:     ${CMAKE_INSTALL_PREFIX}/${MODULES_INSTALL_DIR}")
     message(STATUS "****************************************************************************")
     message(STATUS "")
-endif (DEBUG_PRINT)
\ No newline at end of file
+endif (DEBUG_PRINT)