Dependency Injection extensions

SystemExtensions.DependencyInjection.Tests/Http/HttpClientResolverTests.cs

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+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using System;
+using System.Http;
+using System.Net.Http;
+
+namespace SystemExtensions.DependencyInjection.Tests.Http
+{
+    [TestClass]
+    public class HttpClientResolverTests
+    {
+        private readonly HttpClientResolver httpClientResolver = new();
+        private readonly Mock<Slim.IServiceProvider> serviceProviderMock = new();
+
+        [TestMethod]
+        public void CanResolve_IHttpClient_ReturnsTrue()
+        {
+            var type = typeof(IHttpClient<>);
+
+            var canResolve = this.httpClientResolver.CanResolve(type);
+
+            canResolve.Should().BeTrue();
+        }
+
+        [TestMethod]
+        public void CanResolve_AnythingElse_ReturnsFalse()
+        {
+            var types = new Type[] { typeof(HttpClient), typeof(object), typeof(string), typeof(HttpClientResolverTests), typeof(int) };
+
+            foreach (var type in types)
+            {
+                var canResolve = this.httpClientResolver.CanResolve(type);
+
+                canResolve.Should().BeFalse();
+            }
+        }
+
+        [TestMethod]
+        public void Resolve_TypedClient_ReturnsIHttpClient()
+        {
+            var client = this.httpClientResolver.Resolve(this.serviceProviderMock.Object, typeof(IHttpClient<string>));
+
+            client.Should().BeAssignableTo<IHttpClient<string>>();
+        }
+
+        [TestMethod]
+        public void Resolve_NonGenericType_Throws()
+        {
+            Action action = new(() =>
+            {
+                this.httpClientResolver.Resolve(this.serviceProviderMock.Object, typeof(IHttpClient<>));
+            });
+
+            action.Should().Throw<Exception>();
+        }
+
+        [TestMethod]
+        public void Resolve_RandomType_Throws()
+        {
+            Action action = new(() =>
+            {
+                this.httpClientResolver.Resolve(this.serviceProviderMock.Object, typeof(string));
+            });
+
+            action.Should().Throw<Exception>();
+        }
+    }
+}