Gtest

Add unit testing to wolf with googletest.

If the BUILD_TESTS option is enable in the top level CMakeLists.txt it will retrieve googletest from github and compiles it.

Then all wolf-tests present in the test folder are compiled in one single executable. This executable can be break-down into smaller chunks - see test/CMakeLists.txt

Provide a very simple test as an example.

test/gtest/CMakeLists.txt

@@ -57,5 +57,7 @@ function(wolf_add_gtest target)
   add_dependencies(${target} libgtest)
   target_link_libraries(${target} libgtest)
 
-  add_test(${target} ${target})
+message(WARNING ${CMAKE_BINARY_DIR}/bin)
+
+  add_test(NAME ${target} COMMAND ${target}) #WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/bin
 endfunction()