IBKRTrader/IBKRTrader.Tests/Modules/ModuleRegistryTests.cs

using FluentAssertions;
using IBKRTrader.Core.Modules;
using IBKRTrader.Core.Workers;
using Microsoft.Extensions.DependencyInjection;

namespace IBKRTrader.Tests.Modules;

[Trait("cat", "unit")]
public class ModuleRegistryTests
{
    private sealed class FakeModule(string key) : IModule
    {
        public string Key         => key;
        public string DisplayName => $"Fake {key}";
        public string Description => "test";
        public string Version     => "0.0.1";

        public void RegisterServices(IServiceCollection services) { }
        public Task InitializeAsync(IServiceProvider provider) => Task.CompletedTask;
        public IEnumerable<IWorker> GetWorkers(IServiceProvider provider) => [];
        public Form CreateWindow(IServiceProvider provider) => new();
    }

    [Fact]
    public void Modules_PreservesRegistrationOrder()
    {
        var registry = new ModuleRegistry([new FakeModule("A"), new FakeModule("B")]);

        registry.Modules.Select(m => m.Key).Should().ContainInOrder("A", "B");
    }

    [Fact]
    public void Find_IsCaseInsensitive()
    {
        var registry = new ModuleRegistry([new FakeModule("CT")]);

        registry.Find("ct").Should().NotBeNull();
        registry.Find("CT").Should().NotBeNull();
        registry.Find("XX").Should().BeNull();
    }

    [Fact]
    public void Ctor_NullModules_Throws()
    {
        var act = () => new ModuleRegistry(null!);

        act.Should().Throw<ArgumentNullException>();
    }
}