Fix project references, add test project, and Devin environment config

.devin/environment.yaml

@@ -0,0 +1,43 @@
+# https://docs.devin.ai/onboard-devin/environment-yaml
+# Commands run from the repo root.
+
+# One-time setup: install .NET 10 SDK and Docker (required for build and runtime).
+initialize: |
+  wget -q https://dot.net/v1/dotnet-install.sh -O /tmp/dotnet-install.sh
+  chmod +x /tmp/dotnet-install.sh
+  /tmp/dotnet-install.sh --channel 10.0 --install-dir $HOME/.dotnet
+  echo 'export PATH="$HOME/.dotnet:$PATH"' >> ~/.bashrc
+  echo 'export DOTNET_ROOT="$HOME/.dotnet"' >> ~/.bashrc
+  export PATH="$HOME/.dotnet:$PATH"
+  export DOTNET_ROOT="$HOME/.dotnet"
+
+# Install project dependencies.
+maintenance: |
+  export PATH="$HOME/.dotnet:$PATH"
+  export DOTNET_ROOT="$HOME/.dotnet"
+  cd src && dotnet restore Microservices.sln
+
+knowledge:
+  - name: build
+    contents: |
+      cd src && dotnet build Microservices.sln
+  - name: test
+    contents: |
+      cd src && dotnet test Tests/Microservices.Tests/Microservices.Tests.csproj
+  - name: run
+    contents: |
+      cd src && docker compose up --build -d
+      # Health checks: curl http://localhost:{5000..5005}/healthz
+      # Notification service may need a restart if postgres isn't ready:
+      #   docker compose restart notification-service
+  - name: lint
+    contents: |
+      cd src && dotnet build Microservices.sln --warnaserror
+  - name: project-structure
+    contents: |
+      .NET 10 microservices solution at src/Microservices.sln.
+      Services: Identity (5001), Customer (5002), Order (5003), Product (5004), Notification (5005).
+      API Gateway (YARP) on port 5000.
+      Shared libraries: Shared.Contracts (DTOs/events), Shared.Infrastructure (middleware).
+      Tests: src/Tests/Microservices.Tests (xUnit).
+      Docker Compose for local runtime with PostgreSQL and RabbitMQ.

src/Services/Customer/Customer.API/Customer.API.csproj

@@ -7,8 +7,8 @@
   <ItemGroup>
     <ProjectReference Include="..\Customer.Domain\Customer.Domain.csproj" />
     <ProjectReference Include="..\Customer.Infrastructure\Customer.Infrastructure.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.*" />

src/Services/Identity/Identity.API/Identity.API.csproj

@@ -7,8 +7,8 @@
   <ItemGroup>
     <ProjectReference Include="..\Identity.Domain\Identity.Domain.csproj" />
     <ProjectReference Include="..\Identity.Infrastructure\Identity.Infrastructure.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.*" />

src/Services/Notification/Notification.API/Notification.API.csproj

@@ -7,8 +7,8 @@
   <ItemGroup>
     <ProjectReference Include="..\Notification.Domain\Notification.Domain.csproj" />
     <ProjectReference Include="..\Notification.Infrastructure\Notification.Infrastructure.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.*" />

src/Services/Order/Order.API/Order.API.csproj

@@ -7,8 +7,8 @@
   <ItemGroup>
     <ProjectReference Include="..\Order.Domain\Order.Domain.csproj" />
     <ProjectReference Include="..\Order.Infrastructure\Order.Infrastructure.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.*" />

src/Services/Product/Product.API/Product.API.csproj

@@ -7,8 +7,8 @@
   <ItemGroup>
     <ProjectReference Include="..\Product.Domain\Product.Domain.csproj" />
     <ProjectReference Include="..\Product.Infrastructure\Product.Infrastructure.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
-    <ProjectReference Include="..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
+    <ProjectReference Include="..\..\..\Shared\Shared.Infrastructure\Shared.Infrastructure.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.*" />

src/Tests/Microservices.Tests/Microservices.Tests.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../../Shared/Shared.Contracts/Shared.Contracts.csproj" />
+    <ProjectReference Include="../../Services/Notification/Notification.API/Notification.API.csproj" />
+    <ProjectReference Include="../../Services/Notification/Notification.Domain/Notification.Domain.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+</Project>

src/Tests/Microservices.Tests/NotificationRendererTests.cs

@@ -0,0 +1,97 @@
+using System.Globalization;
+using Notification.API.Services;
+using Notification.Domain.Entities;
+
+namespace Microservices.Tests;
+
+public class NotificationRendererTests : IDisposable
+{
+    private readonly NotificationRenderer _renderer = new();
+    private readonly CultureInfo _originalCulture = CultureInfo.CurrentCulture;
+
+    public NotificationRendererTests()
+    {
+        CultureInfo.CurrentCulture = new CultureInfo("en-US");
+    }
+
+    public void Dispose()
+    {
+        CultureInfo.CurrentCulture = _originalCulture;
+    }
+
+    [Fact]
+    public void RenderNotification_OrderConfirmation_ReturnsSubjectWithFormattedAmount()
+    {
+        var notification = CreateTestNotification(orderTotal: 4999m);
+
+        var (subject, _) = _renderer.RenderNotification(notification);
+
+        Assert.Contains("$49.99", subject);
+        Assert.StartsWith("Order Confirmed", subject);
+    }
+
+    [Fact]
+    public void RenderNotification_OrderConfirmation_ReturnsHtmlBody()
+    {
+        var notification = CreateTestNotification(orderTotal: 10000m);
+
+        var (_, body) = _renderer.RenderNotification(notification);
+
+        Assert.Contains("<!DOCTYPE html>", body);
+        Assert.Contains("Order Confirmed", body);
+        Assert.Contains("$100.00", body);
+    }
+
+    [Fact]
+    public void RenderNotification_OrderConfirmation_IncludesCustomerName()
+    {
+        var notification = CreateTestNotification();
+        notification.CustomerName = "Jane Doe";
+
+        var (_, body) = _renderer.RenderNotification(notification);
+
+        Assert.Contains("Jane Doe", body);
+    }
+
+    [Fact]
+    public void RenderNotification_UnknownType_ReturnsFallback()
+    {
+        var notification = CreateTestNotification();
+        notification.Type = NotificationType.OrderShipped;
+
+        var (subject, body) = _renderer.RenderNotification(notification);
+
+        Assert.Equal("Notification", subject);
+        Assert.Contains(notification.OrderId.ToString(), body);
+    }
+
+    [Theory]
+    [InlineData(0, "$0.00")]
+    [InlineData(100, "$1.00")]
+    [InlineData(1550, "$15.50")]
+    [InlineData(99999, "$999.99")]
+    public void RenderNotification_CurrencyFormatting_ConvertsFromCents(decimal cents, string expected)
+    {
+        var notification = CreateTestNotification(orderTotal: cents);
+
+        var (subject, _) = _renderer.RenderNotification(notification);
+
+        Assert.Contains(expected, subject);
+    }
+
+    private static OrderNotification CreateTestNotification(decimal orderTotal = 5000m)
+    {
+        return new OrderNotification
+        {
+            Id = Guid.NewGuid(),
+            OrderId = Guid.NewGuid(),
+            CustomerId = Guid.NewGuid(),
+            OrderTotal = orderTotal,
+            CustomerEmail = "test@example.com",
+            CustomerName = "Test User",
+            Type = NotificationType.OrderConfirmation,
+            Status = NotificationStatus.Pending,
+            CreatedAt = new DateTime(2026, 1, 15, 14, 30, 0, DateTimeKind.Utc)
+        };
+    }
+}

src/Tests/Microservices.Tests/SharedContractsTests.cs

@@ -0,0 +1,47 @@
+using Shared.Contracts.Events;
+using Shared.Contracts.DTOs;
+
+namespace Microservices.Tests;
+
+public class SharedContractsTests
+{
+    [Fact]
+    public void OrderPlacedEvent_RecordProperties_AreAssignedCorrectly()
+    {
+        var orderId = Guid.NewGuid();
+        var customerId = Guid.NewGuid();
+        var amount = 2500m;
+        var placedAt = DateTime.UtcNow;
+
+        var evt = new OrderPlacedEvent(orderId, customerId, amount, placedAt);
+
+        Assert.Equal(orderId, evt.OrderId);
+        Assert.Equal(customerId, evt.CustomerId);
+        Assert.Equal(amount, evt.TotalAmount);
+        Assert.Equal(placedAt, evt.PlacedAt);
+    }
+
+    [Fact]
+    public void OrderPlacedEvent_RecordEquality_WorksCorrectly()
+    {
+        var orderId = Guid.NewGuid();
+        var customerId = Guid.NewGuid();
+        var now = DateTime.UtcNow;
+
+        var a = new OrderPlacedEvent(orderId, customerId, 100m, now);
+        var b = new OrderPlacedEvent(orderId, customerId, 100m, now);
+
+        Assert.Equal(a, b);
+    }
+
+    [Fact]
+    public void ServiceHealthDto_RecordProperties_AreAssignedCorrectly()
+    {
+        var now = DateTime.UtcNow;
+        var dto = new ServiceHealthDto("identity-service", "Healthy", now);
+
+        Assert.Equal("identity-service", dto.ServiceName);
+        Assert.Equal("Healthy", dto.Status);
+        Assert.Equal(now, dto.CheckedAt);
+    }
+}