14.6 Test it

using Microsoft.Extensions.Logging.Abstractions;
using Shopfront.Trains.FulfilOrder;
using Shopfront.Trains.FulfilOrder.Junctions;
using Shopfront.Trains.FulfilOrder.Models;
using Shopfront.Warehouse;
 
namespace Shopfront.Tests.UnitTests;
 
[TestFixture]
public class PackOrderJunctionTests
{
    [Test]
    public async Task Run_PacksTheOrderUnderItsLabel()
    {
        var orderId = Guid.Parse("3179f9c4-07ba-4f64-ac64-e7026995cc89");
        var junction = new PackOrderJunction(
            new FakeWarehouse { PackingTime = TimeSpan.Zero },
            NullLogger<PackOrderJunction>.Instance
        );
 
        var parcel = await junction.Run(
            (
                new FulfilOrderInput { OrderId = orderId, Items = 2 },
                new ShippingLabel("TRK-1", 5.50m)
            )
        );
 
        parcel.Should().Be(new FulfilOrderOutput(orderId, "TRK-1"));
    }
}

using Microsoft.Extensions.Logging.Abstractions;
using Shopfront.Couriers;
using Shopfront.Trains.FulfilOrder;
using Shopfront.Trains.FulfilOrder.Junctions;
using Shopfront.Warehouse;
 
namespace Shopfront.Tests.UnitTests;
 
[TestFixture]
public class BuyLabelJunctionTests
{
    private static readonly FulfilOrderInput Order = new()
    {
        OrderId = Guid.Parse("3179f9c4-07ba-4f64-ac64-e7026995cc89"),
        Items = 2,
    };
 
    [Test]
    public async Task Run_PricesTheLabelByTheBoxsWeight()
    {
        var junction = new BuyLabelJunction(
            new FakeCourier(),
            NullLogger<BuyLabelJunction>.Instance
        );
 
        var label = await junction.Run(
            (Order, new Box("Small", 1m), new CourierRates(4.00m, 1.50m))
        );
 
        label.Price.Should().Be(5.50m);
        label.TrackingNumber.Should().Be("TRK-3179F9C4");
    }
 
    [Test]
    public async Task Run_Twice_BuysOneLabel()
    {
        var courier = new FakeCourier();
        var junction = new BuyLabelJunction(courier, NullLogger<BuyLabelJunction>.Instance);
        var rates = new CourierRates(4.00m, 1.50m);
 
        var first = await junction.Run((Order, new Box("Small", 1m), rates));
        var again = await junction.Run((Order, new Box("Large", 3m), rates));
 
        again
            .TrackingNumber.Should()
            .Be(first.TrackingNumber, "the courier keys a label by its order");
    }
}

using Microsoft.Extensions.DependencyInjection;
using Shopfront.Couriers;
using Shopfront.Extensions;
using Shopfront.Trains.FulfilOrder;
using Shopfront.Warehouse;
using Trax.Effect.Data.InMemory.Extensions;
using Trax.Effect.Extensions;
using Trax.Mediator.Extensions;
using Trax.Mediator.Services.TrainBus;
 
namespace Shopfront.Tests.IntegrationTests;
 
[TestFixture]
public class FulfilOrderTrainTests
{
    private ServiceProvider _provider = null!;
 
    [SetUp]
    public void BuildTheContainer()
    {
        var services = new ServiceCollection();
        services.AddLogging();
        services.AddShopfront(TestDatabase.ConnectionString);
        // Fakes that answer at once, registered after AddShopfront's, so they win.
        services.AddSingleton<IWarehouse>(
            new FakeWarehouse { ChoosingTime = TimeSpan.Zero, PackingTime = TimeSpan.Zero }
        );
        services.AddSingleton<ICourier>(new FakeCourier { QuoteTime = TimeSpan.Zero });
        services.AddTrax(trax =>
            trax.AddEffects(effects => effects.UseInMemory())
                .AddMediator(typeof(IFulfilOrderTrain).Assembly)
        );
        _provider = services.BuildServiceProvider();
    }
 
    [TearDown]
    public ValueTask DisposeTheContainer() => _provider.DisposeAsync();
 
    [Test]
    public async Task RunAsync_JoinsTheBranchesAndPacksUnderTheLabel()
    {
        var orderId = Guid.Parse("3179f9c4-07ba-4f64-ac64-e7026995cc89");
        var bus = _provider.GetRequiredService<ITrainBus>();
 
        var parcel = await bus.RunAsync<FulfilOrderOutput>(
            new FulfilOrderInput { OrderId = orderId, Items = 3 }
        );
 
        parcel.Should().Be(new FulfilOrderOutput(orderId, "TRK-3179F9C4"));
    }
}

dotnet test

Passed!  - Failed:     0, Passed:    74, Skipped:     0, Total:    74 - Shopfront.Tests.dll (net10.0)