S10: Use DI in tests

src/TestabilityKata.Tests/CustomFileWriterTest.cs

@@ -1,4 +1,5 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Autofac;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 using NSubstitute;
 using System;
 using System.Collections.Generic;
@@ -12,20 +13,28 @@ public class CustomFileWriterTest
     {
         private IMailSender fakeMailSender;
 
+        private ICustomFileWriterFactory customFileWriterFactory;
+
         [TestInitialize]
         public void Initialize()
         {
+            var containerBuilder = new ContainerBuilder();
+            containerBuilder.RegisterModule(new TestabilityKataAutofacConfiguration());
+
             fakeMailSender = Substitute.For<IMailSender>();
+
+            containerBuilder.Register(c => fakeMailSender).As<IMailSender>();
+
+            var container = containerBuilder.Build();
+            customFileWriterFactory = container.Resolve<ICustomFileWriterFactory>();
         }
 
         [TestMethod]
         public void WhenCreatingFileAnEmailIsSentOut()
         {
             const string testFilePath = @"C:\WhenCreatingFileAnEmailIsSentOut.txt";
 
-            var customFileWriter = new CustomFileWriter(
-                fakeMailSender,
-                testFilePath);
+            var customFileWriter = customFileWriterFactory.Create(testFilePath);
 
             //if the existing file exists, delete it before running the test, since
             //we need to get to the point where a new file is created.

src/TestabilityKata.Tests/MailSenderTest.cs

@@ -1,4 +1,5 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Autofac;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -13,7 +14,11 @@ public class MailSenderTest
         [TestInitialize]
         public void Initialize()
         {
-            mailSender = new MailSender();
+            var containerBuilder = new ContainerBuilder();
+            containerBuilder.RegisterModule(new TestabilityKataAutofacConfiguration());
+
+            var container = containerBuilder.Build();
+            mailSender = container.Resolve<IMailSender>();
         }
 
         [TestMethod]

src/TestabilityKata.Tests/ProgramTest.cs

@@ -17,12 +17,17 @@ public class ProgramTest
         [TestInitialize]
         public void Initialize()
         {
+            var containerBuilder = new ContainerBuilder();
+            containerBuilder.RegisterModule(new TestabilityKataAutofacConfiguration());
+
             fakeMailSender = Substitute.For<IMailSender>();
             fakeLogger = Substitute.For<ILogger>();
 
-            program = new Program(
-                fakeLogger,
-                fakeMailSender);
+            containerBuilder.Register(c => fakeMailSender).As<IMailSender>();
+            containerBuilder.Register(c => fakeLogger).As<ILogger>();
+
+            var container = containerBuilder.Build();
+            program = container.Resolve<IProgram>();
         }
 
         [TestMethod]

src/TestabilityKata.Tests/TestabilityKata.Tests.csproj

@@ -1,17 +1,17 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluffySpoon.Testing.Autofake.Autofac" Version="1.0.5" />
-    <PackageReference Include="FluffySpoon.Testing.Autofake.NSubstitute" Version="1.0.5" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0-preview-20170628-02" />
-    <PackageReference Include="MSTest.TestAdapter" Version="1.1.18" />
-    <PackageReference Include="MSTest.TestFramework" Version="1.1.18" />
+    <PackageReference Include="FluffySpoon.Testing.Autofake.Autofac" Version="1.34.0" />
+    <PackageReference Include="FluffySpoon.Testing.Autofake.NSubstitute" Version="1.34.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
   </ItemGroup>
 
   <ItemGroup>

src/TestabilityKata/Program.cs

@@ -1,4 +1,5 @@
-using System;
+using Autofac;
+using System;
 using System.IO;
 
 namespace TestabilityKata
@@ -7,12 +8,12 @@ public class Program : IProgram
     {
         public static void Main(string[] args)
         {
-            var mailSender = new MailSender();
-            new Program(
-                    new Logger(
-                        mailSender,
-                        new CustomFileWriterFactory(mailSender)),
-                    mailSender)
+            var containerBuilder = new ContainerBuilder();
+            containerBuilder.RegisterModule(new TestabilityKataAutofacConfiguration());
+
+            var container = containerBuilder.Build();
+            container
+                .Resolve<IProgram>()
                 .Run();
         }
 

src/TestabilityKata/TestabilityKata.csproj

@@ -2,7 +2,11 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="autofac" Version="4.6.1" />
+  </ItemGroup>
+
 </Project>

src/TestabilityKata/TestabilityKataAutofacConfiguration.cs

@@ -0,0 +1,20 @@
+using Autofac;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace TestabilityKata
+{
+    public class TestabilityKataAutofacConfiguration: Module
+    {
+        protected override void Load(ContainerBuilder builder)
+        {
+            builder
+                .RegisterAssemblyTypes(
+                    typeof(TestabilityKataAutofacConfiguration).Assembly)
+                .AsImplementedInterfaces();
+
+            base.Load(builder);
+        }
+    }
+}