diff --git a/modules/FileStorage/tests/SimpleModule.FileStorage.Tests/FileStorageServiceTests.cs b/modules/FileStorage/tests/SimpleModule.FileStorage.Tests/FileStorageServiceTests.cs
index 51988864..b827bf4f 100644
--- a/modules/FileStorage/tests/SimpleModule.FileStorage.Tests/FileStorageServiceTests.cs
+++ b/modules/FileStorage/tests/SimpleModule.FileStorage.Tests/FileStorageServiceTests.cs
@@ -4,13 +4,14 @@
 using Microsoft.Extensions.Options;
 using SimpleModule.Database;
 using SimpleModule.FileStorage.Contracts;
+using SimpleModule.Tests.Shared.Storage;
 
 namespace SimpleModule.FileStorage.Tests;
 
 public sealed class FileStorageServiceTests : IDisposable
 {
     private readonly FileStorageDbContext _db;
-    private readonly InMemoryStorageProvider _storageProvider;
+    private readonly InMemoryStorage _storageProvider;
     private readonly FileStorageService _service;
 
     public FileStorageServiceTests()
@@ -32,7 +33,7 @@ public FileStorageServiceTests()
         _db.Database.OpenConnection();
         _db.Database.EnsureCreated();
 
-        _storageProvider = new InMemoryStorageProvider();
+        _storageProvider = new InMemoryStorage();
         _service = new FileStorageService(
             _db,
             _storageProvider,
diff --git a/tests/SimpleModule.Tests.Shared/BackgroundJobs/FakeJobExecutionContext.cs b/tests/SimpleModule.Tests.Shared/BackgroundJobs/FakeJobExecutionContext.cs
new file mode 100644
index 00000000..b63c92dd
--- /dev/null
+++ b/tests/SimpleModule.Tests.Shared/BackgroundJobs/FakeJobExecutionContext.cs
@@ -0,0 +1,54 @@
+using System.Text.Json;
+using SimpleModule.BackgroundJobs.Contracts;
+
+namespace SimpleModule.Tests.Shared.BackgroundJobs;
+
+/// <summary>
+/// Test fake for <see cref="IJobExecutionContext"/>. Captures progress reports
+/// and log messages in-memory so tests can assert on what a job did without
+/// wiring up a <c>ProgressChannel</c> or the real <c>DefaultJobExecutionContext</c>.
+/// </summary>
+public sealed class FakeJobExecutionContext : IJobExecutionContext
+{
+    private readonly string? _serializedData;
+    private readonly List<ProgressReport> _progressReports = [];
+    private readonly List<string> _logMessages = [];
+
+    public FakeJobExecutionContext(JobId jobId, string? serializedData = null)
+    {
+        JobId = jobId;
+        _serializedData = serializedData;
+    }
+
+    public FakeJobExecutionContext(JobId jobId, object data)
+        : this(jobId, JsonSerializer.Serialize(data)) { }
+
+    public FakeJobExecutionContext()
+        : this(JobId.From(Guid.NewGuid()), serializedData: null) { }
+
+    public JobId JobId { get; }
+
+    public IReadOnlyList<ProgressReport> ProgressReports => _progressReports;
+
+    public IReadOnlyList<string> LogMessages => _logMessages;
+
+    public T GetData<T>()
+    {
+        if (string.IsNullOrEmpty(_serializedData))
+        {
+            throw new InvalidOperationException("No data was provided for this job.");
+        }
+
+        return JsonSerializer.Deserialize<T>(_serializedData)
+            ?? throw new InvalidOperationException(
+                $"Failed to deserialize job data as {typeof(T).Name}."
+            );
+    }
+
+    public void ReportProgress(int percentage, string? message = null) =>
+        _progressReports.Add(new ProgressReport(percentage, message));
+
+    public void Log(string message) => _logMessages.Add(message);
+
+    public readonly record struct ProgressReport(int Percentage, string? Message);
+}
diff --git a/tests/SimpleModule.Tests.Shared/Datasets/TestDatasetsDbContext.cs b/tests/SimpleModule.Tests.Shared/Datasets/TestDatasetsDbContext.cs
new file mode 100644
index 00000000..7c0117e9
--- /dev/null
+++ b/tests/SimpleModule.Tests.Shared/Datasets/TestDatasetsDbContext.cs
@@ -0,0 +1,57 @@
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using SimpleModule.Database;
+using SimpleModule.Datasets;
+
+namespace SimpleModule.Tests.Shared.Datasets;
+
+/// <summary>
+/// Test subclass of <see cref="DatasetsDbContext"/> backed by a private
+/// in-memory SQLite connection. Use the static <see cref="Create"/> factory
+/// to obtain a ready-to-use, self-owning context; disposing the context
+/// closes the underlying connection.
+/// </summary>
+public sealed class TestDatasetsDbContext : DatasetsDbContext
+{
+    private readonly SqliteConnection _connection;
+
+    private TestDatasetsDbContext(
+        DbContextOptions<DatasetsDbContext> options,
+        IOptions<DatabaseOptions> dbOptions,
+        SqliteConnection connection
+    )
+        : base(options, dbOptions)
+    {
+        _connection = connection;
+    }
+
+    /// <summary>
+    /// Creates a <see cref="TestDatasetsDbContext"/> with a fresh in-memory
+    /// SQLite database. Dispose the returned context to release the
+    /// connection.
+    /// </summary>
+    public static TestDatasetsDbContext Create()
+    {
+        var connection = new SqliteConnection("Data Source=:memory:");
+        connection.Open();
+
+        var options = new DbContextOptionsBuilder<DatasetsDbContext>()
+            .UseSqlite(connection)
+            .Options;
+
+        var dbOptions = Options.Create(
+            new DatabaseOptions { DefaultConnection = "Data Source=:memory:", Provider = "Sqlite" }
+        );
+
+        var context = new TestDatasetsDbContext(options, dbOptions, connection);
+        context.Database.EnsureCreated();
+        return context;
+    }
+
+    public override void Dispose()
+    {
+        base.Dispose();
+        _connection.Dispose();
+    }
+}
diff --git a/modules/FileStorage/tests/SimpleModule.FileStorage.Tests/InMemoryStorageProvider.cs b/tests/SimpleModule.Tests.Shared/Storage/InMemoryStorage.cs
similarity index 90%
rename from modules/FileStorage/tests/SimpleModule.FileStorage.Tests/InMemoryStorageProvider.cs
rename to tests/SimpleModule.Tests.Shared/Storage/InMemoryStorage.cs
index ed3ba23a..867301f0 100644
--- a/modules/FileStorage/tests/SimpleModule.FileStorage.Tests/InMemoryStorageProvider.cs
+++ b/tests/SimpleModule.Tests.Shared/Storage/InMemoryStorage.cs
@@ -1,9 +1,13 @@
 using System.Collections.Concurrent;
 using SimpleModule.Storage;
 
-namespace SimpleModule.FileStorage.Tests;
+namespace SimpleModule.Tests.Shared.Storage;
 
-public sealed class InMemoryStorageProvider : IStorageProvider
+/// <summary>
+/// In-memory <see cref="IStorageProvider"/> for tests. Stores files in a
+/// concurrent dictionary keyed by normalized path.
+/// </summary>
+public sealed class InMemoryStorage : IStorageProvider
 {
     private readonly ConcurrentDictionary<
         string,