[CMake] find boost unit test framework if build testing

CMakeLists.txt

@@ -32,6 +32,9 @@ FINDPYTHON()
 ADD_PROJECT_DEPENDENCY(dynamic-graph REQUIRED PKG_CONFIG_REQUIRES dynamic-graph)
 ADD_PROJECT_DEPENDENCY(eigenpy REQUIRED PKG_CONFIG_REQUIRES eigenpy)
 SEARCH_FOR_BOOST_PYTHON(REQUIRED)
+IF(BUILD_TESTING)
+  FIND_PACKAGE(Boost REQUIRED COMPONENTS unit_test_framework)
+ENDIF(BUILD_TESTING)
 
 # Main Library
 SET(${PROJECT_NAME}_HEADERS
@@ -68,7 +71,9 @@ TARGET_COMPILE_DEFINITIONS(${PROJECT_NAME} PRIVATE PYTHON_LIBRARY="${PYTHON_LIBR
 INSTALL(TARGETS ${PROJECT_NAME} EXPORT ${TARGETS_EXPORT_NAME} DESTINATION lib)
 
 ADD_SUBDIRECTORY(src)
-ADD_SUBDIRECTORY(tests)
+IF(BUILD_TESTING)
+  ADD_SUBDIRECTORY(tests)
+ENDIF(BUILD_TESTING)
 
 PKG_CONFIG_APPEND_LIBS(${PROJECT_NAME})
 INSTALL(FILES package.xml DESTINATION share/${PROJECT_NAME})