Add branch coverage for typeshed-serializer (#1084)

Author: andrea-guarino-sonarsource

python-frontend/typeshed_serializer/tox.ini

@@ -4,7 +4,7 @@ skipsdist = True
 
 [testenv]
 deps = -rrequirements.txt
-commands = python -m pytest --cov=serializer --cov-report xml:cov.xml --ignore=resources
+commands = python -m pytest --cov=serializer --cov-report xml:cov.xml --ignore=resources --cov-branch
 
 [testenv:serialize]
 deps = -rrequirements.txt