Update CMakeLists.txt

Author: lyou

CMakeLists.txt

@@ -146,7 +146,7 @@ add_custom_target(lint COMMAND ${CMAKE_COMMAND} -DPYTHON_EXECUTABLE=${PYTHON_EXE
 
 # ---[ pytest target
 if(BUILD_python)
-  add_custom_target(pytest COMMAND ${Python_EXECUTABLE} -m unittest discover -s caffe/test WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/python )
+  add_custom_target(pytest COMMAND  python3 -m unittest discover -s caffe/test WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/python )
   add_dependencies(pytest pycaffe)
 endif()