@then(r"<STR_LIT>")<EOL>def then_a_model_exists(context, model_name, key, value):
model = apps.get_model(model_name)<EOL>args = {<EOL>key: value<EOL>}<EOL>obj = model.objects.get(**args)<EOL>assert obj is not None<EOL>
:type model_name: str
:type key: str
:type value: str
:type context: behave.runner.Context