Develop

.devcontainer/devcontainer.json

@@ -7,6 +7,7 @@
   ],
   "service": "dev",
   "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+  "postCreateCommand": "/bin/sh ./.devcontainer/postCreateCommand.sh",
   "remoteUser": "vscode",
   "customizations": {
     "vscode": {

.devcontainer/postCreateCommand.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+echo "USER:" `whoami`
+
+# add xunit3 template
+dotnet new install xunit.v3.templates

examples-dotnet.slnx

@@ -1,7 +1,6 @@
 <Solution>
   <Folder Name="/src/">
     <Project Path="src/Examples.Benchmark/Examples.Benchmark.csproj" />
-    <Project Path="src/Examples.DependencyInjection.Autofac.Tests/Examples.DependencyInjection.Autofac.Tests.csproj" />
     <Project Path="src/Examples.DependencyInjection.Extensions.Tests/Examples.DependencyInjection.Extensions.Tests.csproj" />
     <Project Path="src/Examples.DependencyInjection.Mef.Tests/Examples.DependencyInjection.Mef.Tests.csproj" />
     <Project Path="src/Examples.DependencyInjection.Tests/Examples.DependencyInjection.Tests.csproj" />

src/Examples.DependencyInjection.Autofac.Tests/DependencyInjection.Autofac.Tests/Articles/RegisteredOnSameInterface/RegisteredOnSameInterfaceTests.cs

@@ -0,0 +1,90 @@
+using Autofac;
+using Examples.DependencyInjection.Autofac.Tests.Fixtures.Greeting;
+
+namespace Examples.DependencyInjection.Autofac.Tests.Articles.RegisteredOnSameInterface;
+
+public class RegisteredOnSameInterfaceTests
+{
+    [Fact]
+    public void When_RegisteredMultipleServicesWithSameInterface_Then_CanInjectedIntoEnumerable()
+    {
+        var printer = new MockMessagePrinter();
+
+        var builder = new ContainerBuilder();
+
+        builder.RegisterInstance(printer)
+            .As<IMessagePrinter>()
+            .ExternallyOwned();
+        builder.RegisterTypes(
+                typeof(MyMessageGenerator1),
+                typeof(MyMessageGenerator2),
+                typeof(MyMessageGenerator3))
+            .As<IMessageGenerator>()
+            .SingleInstance();
+        builder
+            .RegisterType<GreetingService>()
+            .As<IGreetingService>()
+            .SingleInstance();
+
+        using var container = builder.Build();
+
+        var instance = container.Resolve<IGreetingService>();
+        instance?.Greet();
+
+        var messages = printer.Messages.ToArray();
+        Assert.Equal(3, messages.Length);
+        Assert.Contains("Hello Autofac world 1st.", messages[0]);
+        Assert.Contains("Hello Autofac world 2nd.", messages[1]);
+        Assert.Contains("Hello Autofac world 3rd.", messages[2]);
+    }
+
+    [Fact]
+    public void When_UsingGetServices_Then_ReturnsAllServices()
+    {
+        var builder = new ContainerBuilder();
+        builder.RegisterTypes(
+                typeof(MyMessageGenerator1),
+                typeof(MyMessageGenerator2),
+                typeof(MyMessageGenerator3))
+            .As<IMessageGenerator>()
+            .SingleInstance();
+
+        using var container = builder.Build();
+
+        var actual = container.Resolve<IEnumerable<IMessageGenerator>>();
+        Assert.Equal(3, actual.Count());
+    }
+
+    [Fact]
+    public void When_UsingGetService_Then_ReturnsLastRegisteredService()
+    {
+        var builder = new ContainerBuilder();
+        builder.RegisterTypes(
+                typeof(MyMessageGenerator1),
+                typeof(MyMessageGenerator2),
+                typeof(MyMessageGenerator3))
+            .As<IMessageGenerator>()
+            .SingleInstance();
+
+        using var container = builder.Build();
+
+        var actual = container.Resolve<IMessageGenerator>();
+
+        Assert.Equal("Hello Autofac world 3rd.", actual?.Generate());
+    }
+}
+
+file class MyMessageGenerator1 : IMessageGenerator
+{
+    public string Generate() => "Hello Autofac world 1st.";
+}
+
+file class MyMessageGenerator2 : IMessageGenerator
+{
+    public string Generate() => "Hello Autofac world 2nd.";
+}
+
+file class MyMessageGenerator3 : IMessageGenerator
+{
+    public string Generate() => "Hello Autofac world 3rd.";
+}