simplify the CMakeLists.txt of gserver/tests

paddle/gserver/tests/CMakeLists.txt

 # gserver pacakge unittests
-
 add_simple_unittest(test_LinearChainCRF)
 add_simple_unittest(test_RecurrentLayer)
 
@@ -29,6 +28,26 @@ gserver_test(test_KmaxSeqScore)
 gserver_test(test_Expand)
 gserver_test(test_MaxPoolingWithMaskOutput)
 
+set(PYTHON_PATH 
+   ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d 
+   ${PADDLE_SOURCE_DIR}/python/:${PADDLE_SOURCE_DIR}/paddle/gserver/tests)
+function(gserver_test2 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()
+
+gserver_test2(test_CompareTwoNets)
+gserver_test2(test_PyDataProvider2)
+if(WITH_PYTHON)
+    gserver_test2(test_PyDataProvider)
+endif()
+if(NOT MOBILE_INFERENCE)
+    # TODO(yuyang18): There is some bug in test_RecurrentGradientMachine, I will fix it.
+    gserver_test2(test_RecurrentGradientMachine)
+endif()
+
 ########## test_MKLDNN layers and activations ##########
 if(WITH_MKLDNN)
     add_unittest_without_exec(test_MKLDNN
@@ -36,26 +55,14 @@ if(WITH_MKLDNN)
         MKLDNNTester.cpp
         LayerGradUtil.cpp)
     add_test(NAME test_MKLDNN
-        COMMAND .set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python
-            ${CMAKE_CURRENT_BINARY_DIR}/test_MKLDNN
+        COMMAND ${PYTHON_PATH} ${CMAKE_CURRENT_BINARY_DIR}/test_MKLDNN
             WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
 endif()
 
-############## test_PyDataProvider ########################
-if(WITH_PYTHON)
-    add_unittest_without_exec(test_PyDataProvider
-        test_PyDataProvider.cpp)
-
-    add_test(NAME test_PyDataProvider
-        COMMAND .set_python_path.sh -d ./gserver/tests:${PADDLE_SOURCE_DIR}/python/ ${CMAKE_CURRENT_BINARY_DIR}/test_PyDataProvider
-        WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
-endif()
-
 ############### test_WarpCTCLayer #######################
 if(NOT WITH_DOUBLE AND NOT MOBILE_INFERENCE)
     add_unittest_without_exec(test_WarpCTCLayer
         test_WarpCTCLayer.cpp)
-
     add_test(NAME test_WarpCTCLayer
         COMMAND ${CMAKE_CURRENT_BINARY_DIR}/test_WarpCTCLayer --warpctc_dir=${WARPCTC_LIB_DIR}
         WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
@@ -66,57 +73,25 @@ if(NOT MOBILE_INFERENCE)
     add_unittest(test_Evaluator
         test_Evaluator.cpp)
       
-############### test_RecurrentGradientMachine ###############
-    # TODO(yuyang18): There is some bug in test_RecurrentGradientMachine
-    # I will fix it.
-    add_unittest_without_exec(test_RecurrentGradientMachine
-        test_RecurrentGradientMachine.cpp)
-    add_test(NAME test_RecurrentGradientMachine
-        COMMAND .set_python_path.sh -d
-                ${PADDLE_SOURCE_DIR}/python:${PADDLE_SOURCE_DIR}/paddle/gserver/tests
-                ${CMAKE_CURRENT_BINARY_DIR}/test_RecurrentGradientMachine
-        WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
-      
 ############### test_NetworkCompare ###############
     add_unittest_without_exec(test_NetworkCompare
         test_NetworkCompare.cpp)
     if(WITH_GPU)
-        add_test(NAME test_NetworkCompare
-            COMMAND .set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python ${CMAKE_CURRENT_BINARY_DIR}/test_NetworkCompare --use_gpu=true
-            WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
+        set(use_gpu true)
     else()
-        add_test(NAME test_NetworkCompare
-            COMMAND .set_python_path.sh -d ${PADDLE_SOURCE_DIR}/python ${CMAKE_CURRENT_BINARY_DIR}/test_NetworkCompare --use_gpu=false
-            WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
+        set(use_gpu false)
     endif()
+    add_test(NAME test_NetworkCompare
+        COMMAND ${PYTHON_PATH} ${CMAKE_CURRENT_BINARY_DIR}/test_NetworkCompare --use_gpu=${use_gpu}
+        WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle)
 endif()
 
-
-add_unittest_without_exec(test_PyDataProvider2
-        test_PyDataProvider2.cpp)
-
-add_test(NAME test_PyDataProvider2
-   COMMAND .set_python_path.sh -d ${PADDLE_SOURCE_DIR}/paddle/gserver/tests:${PADDLE_SOURCE_DIR}/python ${CMAKE_CURRENT_BINARY_DIR}/test_PyDataProvider2
-        WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle
-)
-
 ################# test_CompareSparse ##################
 add_unittest_without_exec(test_CompareSparse
     test_CompareSparse.cpp)
 if(NOT ON_TRAVIS)
   add_test(NAME test_CompareSparse
-    COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d
-          ${PADDLE_SOURCE_DIR}/python:${PADDLE_SOURCE_DIR}/paddle/gserver/tests
-              ./.set_port.sh -p port -n 6
-                  ${CMAKE_CURRENT_BINARY_DIR}/test_CompareSparse
+    COMMAND ${PYTHON_PATH} ./.set_port.sh -p port -n 6
+            ${CMAKE_CURRENT_BINARY_DIR}/test_CompareSparse
     WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)
 endif()
-
-################ test_CompareTwoNets ######################
-add_unittest_without_exec(test_CompareTwoNets
-    test_CompareTwoNets.cpp)
-add_test(NAME test_CompareTwoNets
-  COMMAND ${PADDLE_SOURCE_DIR}/paddle/.set_python_path.sh -d
-        ${PADDLE_SOURCE_DIR}/python:${PADDLE_SOURCE_DIR}/paddle/gserver/tests
-        ${CMAKE_CURRENT_BINARY_DIR}/test_CompareTwoNets
-    WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}/paddle/)