Defer calling AddServices

When placed in the constructor, AddServices is called before the constructor of the deriving fixtures runs. This is suboptimal in cases where the implementation of AddServices depends on something that happens in that constructor.

Examples is loading env variables (dotenv.net package) or bootstrapping a WebApplicationFactory like in ASP.NET integration tests.

Author: ChrisDoernen

src/Abstracts/TestBedFixture.cs

@@ -12,7 +12,6 @@ protected TestBedFixture()
 		_services = new ServiceCollection();
 		ConfigurationBuilder = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory());
 		Configuration = GetConfigurationRoot();
-		AddServices(_services, Configuration);
 	}
 
 	public IConfigurationRoot? Configuration { get; private set; }
@@ -25,6 +24,8 @@ public IServiceProvider GetServiceProvider(ITestOutputHelper testOutputHelper)
 			return _serviceProvider;
 		}
 
+		AddServices(_services, Configuration);
+  
 		_services.AddLogging(loggingBuilder => AddLoggingProvider(loggingBuilder, new OutputLoggerProvider(testOutputHelper)));
 		return _serviceProvider = _services.BuildServiceProvider();
 	}