Add integration tests for RuntimeValidatableTypeInfoResolver registra…

…tion

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

src/Validation/test/Microsoft.Extensions.Validation.Tests/ValidationServiceCollectionExtensionsIntegrationTests.cs

@@ -0,0 +1,104 @@
+#pragma warning disable ASP0029 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
+
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.ComponentModel.DataAnnotations;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace Microsoft.Extensions.Validation.Tests;
+
+public class ValidationServiceCollectionExtensionsIntegrationTests
+{
+    [Fact]
+    public void AddValidation_RegistersRuntimeValidatableTypeInfoResolver()
+    {
+        // Arrange
+        var services = new ServiceCollection();
+
+        // Act
+        services.AddValidation();
+        var serviceProvider = services.BuildServiceProvider();
+        var validationOptions = serviceProvider.GetRequiredService<IOptions<ValidationOptions>>().Value;
+
+        // Assert
+        Assert.NotEmpty(validationOptions.Resolvers);
+        Assert.Contains(validationOptions.Resolvers, r => r is RuntimeValidatableTypeInfoResolver);
+        Assert.Contains(validationOptions.Resolvers, r => r is RuntimeValidatableParameterInfoResolver);
+    }
+
+    [Fact]
+    public void AddValidation_RuntimeTypeResolverCanResolveComplexTypes()
+    {
+        // Arrange
+        var services = new ServiceCollection();
+        services.AddValidation();
+        var serviceProvider = services.BuildServiceProvider();
+        var validationOptions = serviceProvider.GetRequiredService<IOptions<ValidationOptions>>().Value;
+
+        // Act
+        var result = validationOptions.TryGetValidatableTypeInfo(typeof(TestPoco), out var validatableInfo);
+
+        // Assert
+        Assert.True(result);
+        Assert.NotNull(validatableInfo);
+        Assert.IsType<RuntimeValidatableTypeInfoResolver.RuntimeValidatableTypeInfo>(validatableInfo);
+    }
+
+    [Fact]
+    public void AddValidation_RuntimeTypeResolverReturnsNullForPrimitiveTypes()
+    {
+        // Arrange
+        var services = new ServiceCollection();
+        services.AddValidation();
+        var serviceProvider = services.BuildServiceProvider();
+        var validationOptions = serviceProvider.GetRequiredService<IOptions<ValidationOptions>>().Value;
+
+        // Act
+        var result = validationOptions.TryGetValidatableTypeInfo(typeof(int), out var validatableInfo);
+
+        // Assert
+        Assert.False(result);
+        Assert.Null(validatableInfo);
+    }
+
+    [Fact]
+    public void AddValidation_ResolversAreInCorrectOrder()
+    {
+        // Arrange
+        var services = new ServiceCollection();
+        services.AddValidation();
+        var serviceProvider = services.BuildServiceProvider();
+        var validationOptions = serviceProvider.GetRequiredService<IOptions<ValidationOptions>>().Value;
+
+        // Assert - RuntimeValidatableParameterInfoResolver should come first, then RuntimeValidatableTypeInfoResolver
+        var parameterResolverIndex = -1;
+        var typeResolverIndex = -1;
+
+        for (int i = 0; i < validationOptions.Resolvers.Count; i++)
+        {
+            if (validationOptions.Resolvers[i] is RuntimeValidatableParameterInfoResolver)
+            {
+                parameterResolverIndex = i;
+            }
+            else if (validationOptions.Resolvers[i] is RuntimeValidatableTypeInfoResolver)
+            {
+                typeResolverIndex = i;
+            }
+        }
+
+        Assert.True(parameterResolverIndex >= 0, "RuntimeValidatableParameterInfoResolver should be registered");
+        Assert.True(typeResolverIndex >= 0, "RuntimeValidatableTypeInfoResolver should be registered");
+        Assert.True(parameterResolverIndex < typeResolverIndex, "Parameter resolver should come before type resolver");
+    }
+
+    public class TestPoco
+    {
+        [Required]
+        public string Name { get; set; } = string.Empty;
+
+        [Range(0, 100)]
+        public int Age { get; set; }
+    }
+}