//[Fact]
public void ServiceInstanceCanBeResolved()
{
// Arrange
var collection = new ServiceCollection();
var instance = new FakeService();
collection.AddSingleton(typeof(IFakeServiceInstance), instance.GetType());
var provider = CreateServiceProvider(collection);
// Act
var service = provider.GetService <IFakeServiceInstance>();
// Assert
Assert.Same(instance, service);
}