IConfigurationManager (see code below).WebApplicationFactory to modify the services to external services.appsettings.Development.json. Ideally, I'd like to remove it from configuration prior to attempting to see if the endpoint is present. However, the approached that I've tried so far haven't yielded results;WebApplicationFactory and override ConfigureWebHost to specify AppConfig:Endpoint to null, it stops attempting to connect to Azure App Configuration, but then it fails validation of the option.WebApplicationFactory.ConfigureTestServices is called, so any manipulation of the option there would fail.