#### Issue Summary CodeCov is showing that we're missing some testing on app.py. [Please see their page and add some tests](https://codecov.io/gh/sendgrid/sendgrid-python/compare/db608f74fbbb4b1d4d71c644da9614de6ed900e3...86abbc199800fefe9114cab7535d28a8114cca78/src/sendgrid/helpers/inbound/app.py)