register-referentie/services/event-subscriber/EventSubscriber.Tests/InMemoryStores.cs

using EventSubscriber.Application;

namespace EventSubscriber.Tests;

/// <summary>In-memory stand-ins for the projection store and notification log, so the
/// projector's behaviour is exercised without Postgres (hand-written stubs, the repo's
/// convention — no mocking library).</summary>
internal sealed class InMemoryNotificationLog : INotificationLog
{
    private readonly Dictionary<string, RecordedNotification> _byKey = [];

    public Task<bool> TryRecordAsync(RecordedNotification notification, CancellationToken ct = default)
        => Task.FromResult(_byKey.TryAdd(notification.Key, notification));

    public Task<IReadOnlyList<RecordedNotification>> AllAsync(CancellationToken ct = default)
        => Task.FromResult<IReadOnlyList<RecordedNotification>>([.. _byKey.Values]);
}

internal sealed class InMemoryProjectionStore : IProjectionStore
{
    private readonly Dictionary<string, RegisterEntry> _byId = [];

    /// <summary>How many times a write was attempted — lets a test prove a deduped delivery
    /// never reaches the store (an idempotent upsert hides the difference in row count alone).</summary>
    public int UpsertCount { get; private set; }

    public Task UpsertAsync(RegisterEntry entry, CancellationToken ct = default)
    {
        UpsertCount++;
        _byId[entry.Id] = entry;
        return Task.CompletedTask;
    }

    public Task ClearAsync(CancellationToken ct = default)
    {
        _byId.Clear();
        return Task.CompletedTask;
    }

    public Task<IReadOnlyList<RegisterEntry>> AllAsync(CancellationToken ct = default)
        => Task.FromResult<IReadOnlyList<RegisterEntry>>([.. _byId.Values]);
}