CI: add testing step and remove OTB_DATA_ROOT

CI/main_ci.cmake

@@ -39,7 +39,7 @@ set (PROJECT_SOURCE_DIR "${OTB_SOURCE_DIR}")
 set (CMAKE_COMMAND "cmake")
 
 # Data directory setting
-set (OTB_DATA_ROOT "${OTB_SOURCE_DIR}/otb-data/") # todo
+# set (OTB_DATA_ROOT "${OTB_SOURCE_DIR}/otb-data/") # todo
 set (OTB_LARGEINPUT_ROOT "") # todo
 
 
@@ -74,6 +74,6 @@ if ( NOT _build_rv EQUAL 0 )
   message( SEND_ERROR "An error occurs during ctest_build.")
 endif()
 
-# ctest_test(PARALLEL_LEVEL 8)
+ctest_test(PARALLEL_LEVEL 8)
 
 ctest_submit()