pytest should not collect notebooks under .ipynb_checkpoints

Author: danielballan

test.sh

@@ -27,7 +27,7 @@ for file in ${files_to_process}; do
     notebook_files+=("${notebook_file}")
 done
 
-pytest --nbval-lax -vv --suppress-no-test-exit-code --durations=10
+pytest --nbval-lax -vv -k 'not .ipynb_checkpoints' --suppress-no-test-exit-code --durations=10
 
 _exitval="$?"