refactor: test and improve DI extension method

src/Gridify/DependencyInjectionExtensions.cs

@@ -10,31 +10,28 @@ namespace Gridify;
 public static class DependencyInjectionExtensions
 {
    /// <summary>
-   /// Automatically scans an assembly for classes that inherit from GridifyMapper<T> and registers them in the Dependency Injection container.
+   /// Automatically scans an assembly for classes that inherit from GridifyMapper&lt;T&gt; and registers them in the Dependency Injection container.
    /// </summary>
    /// <param name="services">The IServiceCollection to which the mappers should be added.</param>
    /// <param name="assembly">The assembly to scan for GridifyMapper implementations.</param>
    /// <param name="lifetime">The service lifetime for the registered mappers (default is Singleton).</param>
    public static IServiceCollection AddGridifyMappers(this IServiceCollection services, Assembly assembly,
-      ServiceLifetime lifetime = ServiceLifetime.Singleton)
+       ServiceLifetime lifetime = ServiceLifetime.Singleton)
    {
-      var mapperType = typeof(GridifyMapper<>);
-
-      var mapperTypes = assembly.GetTypes()
+      var targetTypes = assembly.GetTypes()
          .Where(type =>
-            type is { IsAbstract: false, IsGenericTypeDefinition: false, BaseType.IsGenericType: true } &&
-            type.BaseType.GetGenericTypeDefinition() == mapperType);
+            type is { IsAbstract: false, IsGenericTypeDefinition: false, BaseType.IsGenericType: true, BaseType.Namespace: nameof(Gridify) } &&
+            type.BaseType.GetGenericTypeDefinition() == typeof(GridifyMapper<>));
 
-      foreach (var mapper in mapperTypes)
+      foreach (var type in targetTypes)
       {
-         var genericArguments = mapper.BaseType?.GetGenericArguments();
-         if (genericArguments is { Length: 1 })
-         {
-            var targetType = genericArguments[0];
-var interfaceType = typeof(IGridifyMapper<>).MakeGenericType(targetType);
-services.Add(new ServiceDescriptor(interfaceType, mapper, lifetime));
-         }
+         var genericArguments = type.BaseType?.GetGenericArguments();
+         if (genericArguments is not { Length: 1 }) continue;
+         var targetType = genericArguments[0];
+         var interfaceType = typeof(IGridifyMapper<>).MakeGenericType(targetType);
+         services.Add(new ServiceDescriptor(interfaceType, type, lifetime));
       }
+
       return services;
    }
 }

test/Gridify.Tests/DependencyInjectionTests.cs

@@ -0,0 +1,51 @@
+using System.Reflection;
+using FluentAssertions;
+using Microsoft.Extensions.DependencyInjection;
+using NSubstitute;
+using Xunit;
+
+namespace Gridify.Tests;
+
+public class DependencyInjectionTests
+{
+
+   [Fact]
+   public void AddGridifyMappers_ShouldRegisterMappers()
+   {
+      // Arrange
+      var services = new ServiceCollection();
+      var assemblyMock = GetAssembly();
+
+      // Act
+      services.AddGridifyMappers(assemblyMock);
+
+      // Assert
+      var serviceProvider = services.BuildServiceProvider();
+      serviceProvider.GetService<IGridifyMapper<TestEntity>>().Should().NotBeNull();
+      serviceProvider.GetService<IGridifyMapper<TestEntity2>>().Should().NotBeNull();
+      serviceProvider.GetService<TestMapper>().Should().BeNull();
+      services.Count.Should().Be(2);
+   }
+
+   private static Assembly GetAssembly()
+   {
+      var assemblyMock = Substitute.For<Assembly>();
+      assemblyMock.GetTypes().Returns([
+         typeof(TestMapper),
+         typeof(AnotherTestMapper),
+         typeof(NonGridifyMapper),
+      ]);
+      return assemblyMock;
+   }
+   public record TestEntity(string P1, string P2);
+
+   public record TestEntity2(string P1, string P2);
+
+   public class TestMapper : GridifyMapper<TestEntity>;
+
+   public class AnotherTestMapper : GridifyMapper<TestEntity2>;
+
+
+   // Non-Gridify types for testing
+   public class NonGridifyMapper;
+}

test/Gridify.Tests/Gridify.Tests.csproj

@@ -10,7 +10,9 @@
    <ItemGroup>
       <PackageReference Include="AutoBogus" Version="2.13.1" />
       <PackageReference Include="FluentAssertions" Version="6.0.0" />
+      <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
       <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+      <PackageReference Include="NSubstitute" Version="5.1.0" />
       <PackageReference Include="xunit" Version="2.6.1" />
       <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
         <PrivateAssets>all</PrivateAssets>