test: introduce AutoFixture library and support code

src/Directory.Build.props

@@ -35,6 +35,9 @@
   </ItemGroup>
 
   <ItemGroup Condition="$(ProjectName.EndsWith('.Tests'))">
+    <PackageReference Include="AutoFixture" />
+    <PackageReference Include="AutoFixture.AutoNSubstitute" />
+    <PackageReference Include="AutoFixture.NUnit3" />
     <PackageReference Include="AutofacContrib.NSubstitute" />
     <PackageReference Include="FluentAssertions" />
     <PackageReference Include="FluentAssertions.Json" />

src/Directory.Build.targets

@@ -1,5 +1,8 @@
 <Project>
   <ItemGroup>
+    <PackageReference Update="AutoFixture" Version="4.*" />
+    <PackageReference Update="AutoFixture.AutoNSubstitute" Version="4.*" />
+    <PackageReference Update="AutoFixture.NUnit3" Version="4.*" />
     <PackageReference Update="AutoMapper" Version="10.*" />
     <PackageReference Update="Autofac" Version="6.*" />
     <PackageReference Update="Autofac.Extensions.DependencyInjection" Version="7.*" />

src/TestLibrary/AutoFixture/AutoMockDataAttribute.cs

@@ -0,0 +1,11 @@
+using AutoFixture.NUnit3;
+
+namespace TestLibrary.AutoFixture;
+
+public class AutoMockDataAttribute : AutoDataAttribute
+{
+    public AutoMockDataAttribute()
+        : base(NSubstituteFixture.Create)
+    {
+    }
+}

src/TestLibrary/AutoFixture/InlineAutoMockDataAttribute.cs

@@ -0,0 +1,14 @@
+using System.Diagnostics.CodeAnalysis;
+using AutoFixture.NUnit3;
+
+namespace TestLibrary.AutoFixture;
+
+public class InlineAutoMockDataAttribute : InlineAutoDataAttribute
+{
+    [SuppressMessage("Design", "CA1019", MessageId = "Define accessors for attribute arguments",
+        Justification = "The parameter is forwarded to the base class and not used directly")]
+    public InlineAutoMockDataAttribute(params object[] parameters)
+        : base(NSubstituteFixture.Create, parameters)
+    {
+    }
+}

src/TestLibrary/AutoFixture/NSubstituteFixture.cs

@@ -0,0 +1,22 @@
+using AutoFixture;
+using AutoFixture.AutoNSubstitute;
+
+namespace TestLibrary.AutoFixture;
+
+public static class NSubstituteFixture
+{
+    public static Fixture Create()
+    {
+        var fixture = new Fixture()
+        {
+            OmitAutoProperties = true
+        };
+
+        fixture.Customize(new AutoNSubstituteCustomization
+        {
+            ConfigureMembers = true
+        });
+
+        return fixture;
+    }
+}

src/TestLibrary/TestLibrary.csproj

@@ -2,10 +2,13 @@
   <PropertyGroup>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="NUnit" />
+    <PackageReference Include="AutoFixture" />
+    <PackageReference Include="AutoFixture.AutoNSubstitute" />
+    <PackageReference Include="AutoFixture.NUnit3" />
     <PackageReference Include="FluentAssertions" />
     <PackageReference Include="FluentAssertions.Json" />
     <PackageReference Include="NSubstitute" />
+    <PackageReference Include="NUnit" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Common\Common.csproj" />