Fix pytest run on Windows (#526)

Signed-off-by: Ivan Santiago Paunovic <[email protected]>

Author: ivanpauno

launch/conftest.py

@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from pathlib import PurePath
+
 
 def pytest_ignore_collect(path):
     # pytest doctest messes up when trying to import .launch.py packages, ignore them.
     # It also messes up when trying to import launch.logging.handlers due to conflicts with
     # logging.handlers, ignore that as well.
     return str(path).endswith((
         '.launch.py',
-        'logging/handlers.py',
+        str(PurePath('logging') / 'handlers.py'),
     ))