Initial commit

tests/Interceptors/AutoSaveInterceptorTests.cs

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+using MariesWonderland.Data;
+using MariesWonderland.Interceptors;
+using MariesWonderland.Proto.User;
+using MariesWonderland.Tests.Infrastructure;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace MariesWonderland.Tests.Interceptors;
+
+public class AutoSaveInterceptorTests : InterceptorTestBase
+{
+    private static readonly ILogger<AutoSaveInterceptor> Logger = NullLogger<AutoSaveInterceptor>.Instance;
+
+    private static AutoSaveInterceptor CreateInterceptor(UserDataStore store) =>
+        new(store, Logger);
+
+    /// <summary>
+    /// Verifies that the interceptor returns the continuation's response unchanged.
+    /// </summary>
+    [Fact]
+    public async Task ContinuationResultIsReturned()
+    {
+        var store = CreateEmptyStore();
+        var interceptor = CreateInterceptor(store);
+        var context = FakeServerCallContext.For(userId: 1);
+        var expected = new SetUserNameResponse();
+
+        var result = await CallInterceptor(
+            interceptor,
+            new SetUserNameRequest(),
+            context,
+            () => expected);
+
+        Assert.Same(expected, result);
+    }
+
+    /// <summary>
+    /// Verifies that when the userId is valid but the user is not in the store,
+    /// the interceptor still returns the response without crashing.
+    /// </summary>
+    [Fact]
+    public async Task UnknownUser_ContinuationStillCalled()
+    {
+        var store = CreateEmptyStore();
+        var interceptor = CreateInterceptor(store);
+        var context = FakeServerCallContext.For(userId: 999);
+        var expected = new SetUserNameResponse();
+
+        var result = await CallInterceptor(
+            interceptor,
+            new SetUserNameRequest(),
+            context,
+            () => expected);
+
+        Assert.Same(expected, result);
+    }
+}