diff --git a/docs/web/docker.md b/docs/web/docker.md
index a097d10f..ef05717b 100644
--- a/docs/web/docker.md
+++ b/docs/web/docker.md
@@ -98,7 +98,7 @@ sqlserver # Test database
database.migrations # Fresh schema
database.seed # Test data
api.specs # Reqnroll BDD tests
-unit.tests # All Features.*.Tests unit test projects
+unit.tests # All Features.*.Tests and Shared.*.Tests unit test projects
frontend.tests # Storybook Vitest + Playwright suites (own Playwright image)
```
diff --git a/docs/web/testing.md b/docs/web/testing.md
index 18a299ab..9f50e28d 100644
--- a/docs/web/testing.md
+++ b/docs/web/testing.md
@@ -76,10 +76,11 @@ docker compose --env-file web/.env.test -f web/docker-compose.test.yaml down -v
You can run individual test projects locally without Docker:
-### Feature slice unit tests
+### Feature slice and shared unit tests
Each feature slice has its own test project, covering its command/query
-handlers:
+handlers. Shared cross-cutting code (e.g. MediatR pipeline behaviors) has
+its own test project under `Shared/`:
```bash
cd web/backend
@@ -87,9 +88,10 @@ dotnet test Features/Features.Users.Tests/Features.Users.Tests.csproj
dotnet test Features/Features.Breweries.Tests/Features.Breweries.Tests.csproj
dotnet test Features/Features.Emails.Tests/Features.Emails.Tests.csproj
dotnet test Features/Features.PhotoUpload.Tests/Features.PhotoUpload.Tests.csproj
+dotnet test Shared/Shared.Application.Tests/Shared.Application.Tests.csproj
# Or run all of them at once via the solution:
-for proj in Features/*.Tests; do dotnet test "$proj"; done
+for proj in Features/*.Tests Shared/*.Tests; do dotnet test "$proj"; done
```
**Requirements**:
diff --git a/web/backend/API/API.Core/Dockerfile b/web/backend/API/API.Core/Dockerfile
index f1af52e9..3973aa04 100644
--- a/web/backend/API/API.Core/Dockerfile
+++ b/web/backend/API/API.Core/Dockerfile
@@ -35,6 +35,7 @@ COPY ["Features/Features.Users/Features.Users.csproj", "Features/Features.Users/
COPY ["Features/Features.Users.Tests/Features.Users.Tests.csproj", "Features/Features.Users.Tests/"]
COPY ["Configuration/Configuration.csproj", "Configuration/"]
COPY ["Shared/Shared.Application/Shared.Application.csproj", "Shared/Shared.Application/"]
+COPY ["Shared/Shared.Application.Tests/Shared.Application.Tests.csproj", "Shared/Shared.Application.Tests/"]
COPY ["Shared/Shared.Contracts/Shared.Contracts.csproj", "Shared/Shared.Contracts/"]
RUN dotnet restore "Biergarten.API.slnx"
COPY . .
diff --git a/web/backend/API/API.Core/ServiceCollectionExtensions.cs b/web/backend/API/API.Core/ServiceCollectionExtensions.cs
index 3f168f89..f6fdcb7f 100644
--- a/web/backend/API/API.Core/ServiceCollectionExtensions.cs
+++ b/web/backend/API/API.Core/ServiceCollectionExtensions.cs
@@ -46,6 +46,7 @@ internal static class ServiceCollectionExtensions
cfg.RegisterServicesFromAssembly(typeof(UploadPhotoCommand).Assembly);
cfg.RegisterServicesFromAssembly(typeof(IEmailDispatcher).Assembly);
cfg.RegisterServicesFromAssembly(typeof(CityController).Assembly);
+ cfg.AddOpenBehavior(typeof(UnhandledExceptionLoggingBehavior<,>));
cfg.AddOpenBehavior(typeof(ValidationBehavior<,>));
});
diff --git a/web/backend/API/API.Specs/Dockerfile b/web/backend/API/API.Specs/Dockerfile
index d303ea1d..cb962d08 100644
--- a/web/backend/API/API.Specs/Dockerfile
+++ b/web/backend/API/API.Specs/Dockerfile
@@ -25,6 +25,7 @@ COPY ["Features/Features.Users/Features.Users.csproj", "Features/Features.Users/
COPY ["Features/Features.Users.Tests/Features.Users.Tests.csproj", "Features/Features.Users.Tests/"]
COPY ["Configuration/Configuration.csproj", "Configuration/"]
COPY ["Shared/Shared.Application/Shared.Application.csproj", "Shared/Shared.Application/"]
+COPY ["Shared/Shared.Application.Tests/Shared.Application.Tests.csproj", "Shared/Shared.Application.Tests/"]
COPY ["Shared/Shared.Contracts/Shared.Contracts.csproj", "Shared/Shared.Contracts/"]
RUN dotnet restore "Biergarten.API.slnx"
COPY . .
diff --git a/web/backend/Biergarten.API.slnx b/web/backend/Biergarten.API.slnx
index b2734ffb..6d5e7d17 100644
--- a/web/backend/Biergarten.API.slnx
+++ b/web/backend/Biergarten.API.slnx
@@ -47,5 +47,6 @@
+
diff --git a/web/backend/Dockerfile.tests b/web/backend/Dockerfile.tests
index bab9c101..55c661b5 100644
--- a/web/backend/Dockerfile.tests
+++ b/web/backend/Dockerfile.tests
@@ -5,11 +5,11 @@ COPY . .
RUN dotnet restore "Biergarten.API.slnx"
RUN dotnet build "Biergarten.API.slnx" -c $BUILD_CONFIGURATION
-# Runs every Features.*.Tests project (unit + DbMocker-backed repository tests). API.Specs is
-# excluded here since it's a separate BDD/integration suite, run by its own compose service
-# against the live, seeded database.
+# Runs every Features.*.Tests and Shared.*.Tests project (unit + DbMocker-backed repository
+# tests). API.Specs is excluded here since it's a separate BDD/integration suite, run by its own
+# compose service against the live, seeded database.
FROM build AS final
ARG BUILD_CONFIGURATION=Release
WORKDIR /src
RUN mkdir -p /app/test-results
-ENTRYPOINT ["sh", "-c", "set -e; for proj in Features/*.Tests; do dotnet test \"$proj\" -c ${BUILD_CONFIGURATION:-Release} --logger \"trx;LogFileName=/app/test-results/$(basename \"$proj\").trx\"; done"]
+ENTRYPOINT ["sh", "-c", "set -e; for proj in Features/*.Tests Shared/*.Tests; do dotnet test \"$proj\" -c ${BUILD_CONFIGURATION:-Release} --logger \"trx;LogFileName=/app/test-results/$(basename \"$proj\").trx\"; done"]
diff --git a/web/backend/Shared/Shared.Application.Tests/Behaviors/UnhandledExceptionLoggingBehaviorTests.cs b/web/backend/Shared/Shared.Application.Tests/Behaviors/UnhandledExceptionLoggingBehaviorTests.cs
new file mode 100644
index 00000000..5ccbb47a
--- /dev/null
+++ b/web/backend/Shared/Shared.Application.Tests/Behaviors/UnhandledExceptionLoggingBehaviorTests.cs
@@ -0,0 +1,111 @@
+using FluentAssertions;
+using FluentValidation;
+using FluentValidation.Results;
+using MediatR;
+using Microsoft.Extensions.Logging;
+using Moq;
+using Shared.Application.Behaviors;
+
+namespace Shared.Application.Tests.Behaviors;
+
+public class UnhandledExceptionLoggingBehaviorTests
+{
+ private readonly Mock<
+ ILogger>
+ > _loggerMock = new();
+
+ private UnhandledExceptionLoggingBehavior CreateBehavior() =>
+ new(_loggerMock.Object);
+
+ [Fact]
+ public async Task Handle_WhenHandlerThrowsGenericException_LogsOnceAndRethrows()
+ {
+ UnhandledExceptionLoggingBehavior behavior = CreateBehavior();
+ TestRequest request = new("aaron", "hunter2");
+ InvalidOperationException thrown = new("boom");
+ RequestHandlerDelegate next = () => throw thrown;
+
+ Func act = async () => await behavior.Handle(request, next, CancellationToken.None);
+
+ (await act.Should().ThrowAsync())
+ .Which.Should()
+ .BeSameAs(thrown);
+ VerifyLogError(Times.Once());
+ }
+
+ [Fact]
+ public async Task Handle_WhenValidationExceptionThrown_DoesNotLogAndRethrows()
+ {
+ UnhandledExceptionLoggingBehavior behavior = CreateBehavior();
+ TestRequest request = new("aaron", "hunter2");
+ ValidationException thrown = new([new ValidationFailure("Username", "is required")]);
+ RequestHandlerDelegate next = () => throw thrown;
+
+ Func act = async () => await behavior.Handle(request, next, CancellationToken.None);
+
+ (await act.Should().ThrowAsync()).Which.Should().BeSameAs(thrown);
+ VerifyLogError(Times.Never());
+ }
+
+ [Fact]
+ public async Task Handle_WhenHandlerSucceeds_DoesNotLogAndReturnsResponse()
+ {
+ UnhandledExceptionLoggingBehavior behavior = CreateBehavior();
+ TestRequest request = new("aaron", "hunter2");
+ TestResponse response = new("ok");
+ RequestHandlerDelegate next = () => Task.FromResult(response);
+
+ TestResponse result = await behavior.Handle(request, next, CancellationToken.None);
+
+ result.Should().BeSameAs(response);
+ VerifyLogError(Times.Never());
+ }
+
+ [Fact]
+ public async Task Handle_WhenHandlerThrows_RedactsSensitiveFieldsInLoggedPayload()
+ {
+ UnhandledExceptionLoggingBehavior behavior = CreateBehavior();
+ TestRequest request = new("aaron", "hunter2");
+ RequestHandlerDelegate next = () =>
+ throw new InvalidOperationException("boom");
+
+ Func act = async () => await behavior.Handle(request, next, CancellationToken.None);
+ await act.Should().ThrowAsync();
+
+ string loggedMessage = CaptureLoggedMessage();
+ loggedMessage.Should().Contain("aaron").And.NotContain("hunter2");
+ }
+
+ private void VerifyLogError(Times times) =>
+ _loggerMock.Verify(
+ l =>
+ l.Log(
+ LogLevel.Error,
+ It.IsAny(),
+ It.IsAny(),
+ It.IsAny(),
+ It.IsAny>()
+ ),
+ times
+ );
+
+ private string CaptureLoggedMessage()
+ {
+ var invocation = _loggerMock
+ .Invocations.Where(i => i.Method.Name == nameof(ILogger.Log))
+ .Should()
+ .ContainSingle()
+ .Subject;
+
+ object state = invocation.Arguments[2];
+ object? exception = invocation.Arguments[3];
+ object formatter = invocation.Arguments[4];
+ System.Reflection.MethodInfo invokeMethod = formatter.GetType().GetMethod("Invoke")!;
+
+ return (string)invokeMethod.Invoke(formatter, [state, exception])!;
+ }
+}
+
+public record TestRequest(string Username, string Password) : IRequest;
+
+public record TestResponse(string Value);
diff --git a/web/backend/Shared/Shared.Application.Tests/Shared.Application.Tests.csproj b/web/backend/Shared/Shared.Application.Tests/Shared.Application.Tests.csproj
new file mode 100644
index 00000000..35a05cfc
--- /dev/null
+++ b/web/backend/Shared/Shared.Application.Tests/Shared.Application.Tests.csproj
@@ -0,0 +1,26 @@
+
+
+ net10.0
+ enable
+ enable
+ false
+ Shared.Application.Tests
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/web/backend/Shared/Shared.Application/Behaviors/UnhandledExceptionLoggingBehavior.cs b/web/backend/Shared/Shared.Application/Behaviors/UnhandledExceptionLoggingBehavior.cs
new file mode 100644
index 00000000..08721878
--- /dev/null
+++ b/web/backend/Shared/Shared.Application/Behaviors/UnhandledExceptionLoggingBehavior.cs
@@ -0,0 +1,86 @@
+using System.Text.Json;
+using System.Text.Json.Serialization.Metadata;
+using FluentValidation;
+using MediatR;
+using Microsoft.Extensions.Logging;
+
+namespace Shared.Application.Behaviors;
+
+///
+/// MediatR pipeline behavior that logs unhandled exceptions together with the request type and
+/// payload, then rethrows them unchanged for GlobalExceptionFilter to map to a status code.
+///
+public class UnhandledExceptionLoggingBehavior(
+ ILogger> logger
+) : IPipelineBehavior
+ where TRequest : IRequest
+{
+ private static readonly string[] SensitiveFieldNames = ["password", "token"];
+
+ private static readonly JsonSerializerOptions SerializerOptions = new()
+ {
+ TypeInfoResolver = new DefaultJsonTypeInfoResolver
+ {
+ Modifiers = { RedactSensitiveProperties },
+ },
+ };
+
+ ///
+ public async Task Handle(
+ TRequest request,
+ RequestHandlerDelegate next,
+ CancellationToken cancellationToken
+ )
+ {
+ try
+ {
+ return await next();
+ }
+ catch (ValidationException)
+ {
+ // Expected: ValidationBehavior already reports these as request errors, not incidents.
+ throw;
+ }
+ catch (Exception ex)
+ {
+ logger.LogError(
+ ex,
+ "Unhandled exception while processing {RequestName}: {RequestPayload}",
+ typeof(TRequest).Name,
+ Serialize(request)
+ );
+ throw;
+ }
+ }
+
+ private static string Serialize(TRequest request)
+ {
+ try
+ {
+ return JsonSerializer.Serialize(request, SerializerOptions);
+ }
+ catch (Exception)
+ {
+ return "";
+ }
+ }
+
+ private static void RedactSensitiveProperties(JsonTypeInfo typeInfo)
+ {
+ if (typeInfo.Kind != JsonTypeInfoKind.Object)
+ return;
+
+ foreach (JsonPropertyInfo property in typeInfo.Properties)
+ {
+ if (property.PropertyType != typeof(string))
+ continue;
+
+ if (
+ SensitiveFieldNames.Any(name =>
+ property.Name.Contains(name, StringComparison.OrdinalIgnoreCase)
+ )
+ )
+ property.Get = static _ => "***REDACTED***";
+ }
+ }
+}
diff --git a/web/backend/Shared/Shared.Application/Shared.Application.csproj b/web/backend/Shared/Shared.Application/Shared.Application.csproj
index be50cf0f..305d1df0 100644
--- a/web/backend/Shared/Shared.Application/Shared.Application.csproj
+++ b/web/backend/Shared/Shared.Application/Shared.Application.csproj
@@ -9,5 +9,6 @@
+