Merge pull request #14014 from JiabinYang/inference_model_mac

this will fix the inference model not found problem

Author: JiabinYang

python/paddle/fluid/tests/CMakeLists.txt

@@ -1,8 +1,4 @@
-if(NOT APPLE)
-  set(PYTHON_TESTS_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH "python tests directory")
-else()
-  set(PYTHON_TESTS_DIR ${PADDLE_BINARY_DIR}/python/paddle/fluid/tests)
-endif(NOT APPLE)
+set(PYTHON_TESTS_DIR ${PADDLE_BINARY_DIR}/python/paddle/fluid/tests CACHE INTERNAL "python tests directory")
 
 file(GLOB TEST_OPS RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "test_*.py")
 string(REPLACE ".py" "" TEST_OPS "${TEST_OPS}")