Moving on to the business layer, you should verify that each service can retrieve data from the InMemory database through the repository.
First, create a new folder in the integration test project called ServiceTests. Within that folder, create a folder named SpeakerServiceTests. This folder is where the tests specific to the SpeakerService will be created.
Create a new test file named GetAll. Add a test method to verify that the service can be created:
[Fact]
public void ItExists()
{
var options = new DbContextOptionsBuilder<SpeakerMeetContext>()
.UseInMemoryDatabase("SpeakerMeetInMemory")
.Options;
var context = new SpeakerMeetContext(options);
var repository = new Repository<Speaker>(context);
var gravatarService = new GravatarService();
var speakerService = new SpeakerService(repository, gravatarService);
}