Initial commit

tests/Interceptors/InterceptorTestBase.cs

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+using Grpc.Core;
+using Grpc.Core.Interceptors;
+using MariesWonderland.Data;
+using MariesWonderland.Tests.Infrastructure;
+
+namespace MariesWonderland.Tests.Interceptors;
+
+/// <summary>
+/// Base class for interceptor tests. Provides shared helpers for invoking
+/// an interceptor's unary handler directly and constructing empty user stores.
+/// </summary>
+public abstract class InterceptorTestBase
+{
+    /// <summary>
+    /// Invokes an interceptor's UnaryServerHandler directly, bypassing the gRPC pipeline.
+    /// The continuation simply calls <paramref name="continuationBody"/> and returns its result.
+    /// </summary>
+    protected static Task<TResponse> CallInterceptor<TRequest, TResponse>(
+        Interceptor interceptor,
+        TRequest request,
+        ServerCallContext context,
+        Func<TResponse> continuationBody)
+        where TRequest : class
+        where TResponse : class
+    {
+        return interceptor.UnaryServerHandler(
+            request,
+            context,
+            (req, ctx) => Task.FromResult(continuationBody()));
+    }
+
+    /// <summary>Creates a <see cref="UserDataStore"/> with no users registered.</summary>
+    protected static UserDataStore CreateEmptyStore() =>
+        new(new DarkMasterMemoryDatabase());
+
+    /// <summary>
+    /// Creates a <see cref="UserDataStore"/> pre-loaded with the given user database.
+    /// </summary>
+    protected static UserDataStore CreateStoreWithUser(long userId, DarkUserMemoryDatabase userDb)
+    {
+        var store = new UserDataStore(new DarkMasterMemoryDatabase());
+        store.Set(userId, userDb);
+        return store;
+    }
+
+    /// <summary>Shorthand for <see cref="FakeServerCallContext.For"/>.</summary>
+    protected static FakeServerCallContext ContextFor(long userId) =>
+        FakeServerCallContext.For(userId);
+}