How to test an app with an asp.net core web api backend

l have a solution that contains an asp.net core mvc web app project and a xamarin.forms project. the web api has a comics api that
will be consumed by the web app and the web app. l have written the code to consume the api in the mobile but l need to run the web
app and mobile app together to successfully test that the api is been consumed by the mobile app. How can l run the web app and the
mobile app concurrently.