How to create Masstransit's Test Harness with Automock?

Question

In order to create the test harness for the SubmitOrderConsumer, I will have to build a ServiceCollection containing all the depdencies of SubmitOrderConsumer.

Mock<INotifier> mockNotifier = new Mock<INotifier>();
Mock<IStockChecker> mockStockChecker = new Mock<IStockChecker>();
Mock<IFidelityUpdater> mockFidelityUpdater = new Mock<IFidelityUpdater>();
Mock<IPromotionManager> mockPromotionManager = new Mock<IPromotionManager>();
await using var provider = new ServiceCollection()
    .AddMassTransitTestHarness(cfg =>
    {
        cfg.AddConsumer<SubmitOrderConsumer>();
    })
    .AddSingleton<INotifier>(mockNotifier.Object)
    .AddSingleton<IStockChecker>(mockStockChecker.Object)
    .AddSingleton<IFidelityUpdater>(mockFidelityUpdater.Object)
    .AddSingleton<IPromotionManager>(mockPromotionManager.Object)
    ..
    .BuildServiceProvider(true);ds

var harness = provider.GetRequiredService<ITestHarness>();
...
mockNotifier.Verify(...)

The Moq.Automock library helps me to create the SubmitOrderConsumer and auto-mock all its depdencies so the above codes is reduced to

AutoMocker mocker = new AutoMocker();
await using var provider = new ServiceCollection()
    .AddMassTransitTestHarness(cfg =>
    {
        cfg.AddConsumer<SubmitOrderConsumer>();
    })
    .AddSingleton(mocker.CreateInstance<SubmitOrderConsumer>())
    .BuildServiceProvider(true);

var harness = provider.GetRequiredService<ITestHarness>();
...
mocker.GetMock<INotifier>().Verify(...)

Question:

The class AutoMocker is also a IServiceProvider, so the above codes have 2 IServiceProvider:

• the first IServiceProvider is the mocker which can resolve the SubmitOrderConsumer
• the second IServiceProvider is the provider which can resolve the ITestHarness

is it possible to create the ITestHarness with my mocker IServiceProvider? something like

ITestHarness harness = new ContainerTestHarness(mocker);