Suggestion message is not clear when gtest is not found

[130s]

When failed to find gtest, catkin ends with the following message:

$ cd catkin_ws && mkdir build && cd build
$ cmake ../src
 :
CMake Warning at catkin/cmake/test/gtest.cmake:99 (message):
  gtest not found, C++ tests can not be built.  You can run 'svn checkout
  http://googletest.googlecode.com/svn/tags/release-1.6.0 gtest' in the root
  of your workspace

Placing gtest folder at the root of workspace as suggested (in the case above at catkin_ws) fails with the same message. cmake/test/gtest.cmake looks trying to search under src.

So putting it in src works as a workaround. Or change search path up to root directory should work too? Although placing non-catkin module under catkin's workspace makes me a bit uneasy, I assume this is a result of working around the issue discussed here. I just wanted to point out that the message isn't clear.

catkin 0.5.67

[tfoote]

It should probably state SOURCE_SPACE rep 128