simplify the CMakeLists.txt of trainer/tests

paddle/trainer/tests/CMakeLists.txt

-################# test_Compare ############################
-add_unittest_without_exec(test_Compare
-    test_Compare.cpp)
-add_test(NAME test_Compare
-  COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python
-        ${CMAKE_CURRENT_BINARY_DIR}/test_Compare
-    WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
+set(PYTHON_PATH 
+   ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d 
+   ${PADDLE_SOURCE_DIR}/python/:${PADDLE_SOURCE_DIR}/paddle/trainer/tests)
+function(trainer_test TARGET)
+  add_unittest_without_exec(${TARGET} ${TARGET}.cpp)
+  add_test(NAME ${TARGET}
+    COMMAND ${PYTHON_PATH} ${CMAKE_CURRENT_BINARY_DIR}/${TARGET}
+      WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
+endfunction()
 
-################# test_Trainer ###########################
-add_unittest_without_exec(test_Trainer
-    test_Trainer.cpp)
-add_test(NAME test_Trainer
-  COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python/
-        ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python/
-        ${CMAKE_CURRENT_BINARY_DIR}/test_Trainer
-    WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
+trainer_test(test_Compare)
+trainer_test(test_PyDataProviderWrapper)
+trainer_test(test_recurrent_machine_generation)
+trainer_test(test_Trainer)
 
 ############### test_TrainerOnePass ##########################
 if(WITH_PYTHON)
@@ -22,32 +20,13 @@ if(WITH_PYTHON)
   add_unittest_without_exec(test_TrainerOnePass
       test_TrainerOnePass.cpp)
   add_test(NAME test_TrainerOnePass
-    COMMAND  ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d
-          ${PADDLE_SOURCE_DIR}/python/:${PADDLE_SOURCE_DIR}/paddle/trainer/tests
+    COMMAND ${PYTHON_PATH} ${CMAKE_CURRENT_BINARY_DIR}/${TARGET}
           ${PADDLE_SOURCE_DIR}/paddle/.set_port.sh -p port ${CMAKE_CURRENT_BINARY_DIR}/test_TrainerOnePass
       WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
 endif()
 
-################# test_recurrent_machine_generation ###############
-add_unittest_without_exec(test_recurrent_machine_generation
-    test_recurrent_machine_generation.cpp)
-add_test(NAME test_recurrent_machine_generation
-  COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python/
-        ${CMAKE_CURRENT_BINARY_DIR}/test_recurrent_machine_generation
-    WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
-
-#################### test_PyDataProviderWrapper #########################
-add_unittest_without_exec(test_PyDataProviderWrapper
-    test_PyDataProviderWrapper.cpp)
-
-add_test(NAME test_PyDataProviderWrapper
-  COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d
-        ${PADDLE_SOURCE_DIR}/python/:${PADDLE_SOURCE_DIR}/paddle/trainer/tests
-        ${CMAKE_CURRENT_BINARY_DIR}/test_PyDataProviderWrapper
-    WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
-
 #################### test_config_parser #########################
 add_test(NAME test_config_parser
-  COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python/
+  COMMAND ${PYTHON_PATH} ${CMAKE_CURRENT_BINARY_DIR}/${TARGET}
         ${PYTHON_EXECUTABLE} ${PADDLE_SOURCE_DIR}/paddle/trainer/tests/config_parser_test.py
     WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)