public void AddContextInitializer()
{
var services = new ServiceCollection();
var moduleType = typeof(StubModule1);
var initializer = Substitute.For<IModuleContextInitializer<StubContext1>>();
var moduleBuilder = new ModuleBuilder(services, moduleType);
moduleBuilder.AddContextInitializer(initializer);
Assert.Equal(1, services.Count);
Assert.Equal(typeof(ModuleContextInitializerDescriptor), services[0].ServiceType);
Assert.Null(services[0].ImplementationType);
Assert.NotNull(services[0].ImplementationInstance);
Assert.Equal(typeof(ModuleContextInitializerDescriptor), services[0].ImplementationInstance.GetType());
Assert.Equal(ServiceLifetime.Singleton, services[0].Lifetime);
}