Let user specify pytest args

bin/tests

@@ -4,5 +4,9 @@ set -e
 
 SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 cd ${SCRIPT_DIR}/../tests
-pytest *.py
+if [ $# -eq 0 ]; then
+    pytest *.py
+else
+    pytest ""$@""
+fi