why "gtest" in ros giving CMake Error when i compile the code?

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i am running a simple gtest, when i compile my package with catkin_make, i am getting below error. Can anyone help to resolve this?

CMake Error at /opt/ros/indigo/share/catkin/cmake/test/gtest.cmake:71 (message):
  catkin_add_executable_with_gtest() must be called after catkin_package() so
  that default output directories for the executables are defined
Call Stack (most recent call first):
  /opt/ros/indigo/share/catkin/cmake/test/gtest.cmake:34 (catkin_add_executable_with_gtest)
  ros_gtest/CMakeLists.txt:26 (catkin_add_gtest)

i followed this link http://ysonggit.github.io/coding/2014...