Make the .AddAttributedDI explicitly opt in + e2e tests (#21)

* WIP e2e tests

* Adding readme

* Compiles and tests pass

* Verified that transitive dependencies also work as expected.

* this works

* fixed small issue that I had noticed

* reworking

* WIP

* Fixing some issues

* let's see whether this is unecessary

* try it out

* This works

* Start over

* Fixed path and other issues

* Prepare references for e2e tests

* Move to nested directory

* updating nuget packages

* Refactoring MEDI dep

* adding missing assets to solution

* Make sure that test projects do not affect how analyzer works

* correct nuget path

* Some progress with e2e tests

* Looks like we had caught a bug

* Turn off e2e for now.

* Small refactoring

* WIP

* refactored

* Fixing compilation issues and refactoring tests

* WIP

* WIP

* codex refactoring. Reivewing and getting fixed.

* WIP

* Refactoring tests to my liking

* Updating global usings

* Fixing tests

* I configured IDE to automatically format on save instead of having codex to do that.

* Fixing compilation issue

* Including refernce in the unit test output

* Cover the case when there are no registered services but flag is present

* removing outdated opt in things and adding e2e to sln

* WIP

* E2E tests finally ready

* Small refactoring

* Clean up xml formatting rules

---------

Co-authored-by: Dmytro Ett <dmytro.ett@outlook.com>

Author: dmytroett

.editorconfig

@@ -7,7 +7,7 @@ end_of_line = lf
 insert_final_newline = false
 indent_style = space
 
-[*.csproj]
+[*.{csproj,props}]
 indent_size = 2
 
 # C# files

.github/copilot-instructions.md

@@ -363,4 +363,4 @@ MigrationBackup/
 FodyWeavers.xsd
 
 # JetBrains
-.idea
+.idea

.github/instructions/source-generators.instructions.md

@@ -18,23 +18,6 @@ This project is about building a library to simplify dependency registration in
 - Do not overuse comments; place them only where they add real value.
 - Minimize public surface area: Use `private` or `internal` access modifiers by default unless the API is intentionally designed to be public. A smaller public API is easier to maintain and reduces breaking change concerns in future versions.
 
-## Code Style & Formatting
-
-When done with code generation or modification, you must:
-
-1. Run `dotnet format --include <list-of-changed-files>`
-2. Ensure no formatting issues remain
-
-Example:
-```
-dotnet format --include src/AttributedDI/MyClass.cs
-```
-
-For multiple files:
-```
-dotnet format --include src/AttributedDI/File1.cs src/AttributedDI/File2.cs
-```
-
 ## Public API Documentation
 
 This is a library. **All** public methods, properties, classes, and interfaces in library code **must** have XML documentation (///).

.gitignore

@@ -17,20 +17,27 @@
     <Project Path="src/AttributedDI/AttributedDI.csproj" />
   </Folder>
   <Folder Name="/test/">
-    <Project Path="test/AttributedDI.IntegrationTests/AttributedDI.IntegrationTests.csproj" />
-    <Project Path="test/AttributedDI.GenerateExtensionsOptIn.IntegrationTests/AttributedDI.GenerateExtensionsOptIn.IntegrationTests.csproj" />
-    <Project Path="test/AttributedDI.GenerateExtensionsOptOut.IntegrationTests/AttributedDI.GenerateExtensionsOptOut.IntegrationTests.csproj" />
-    <Project Path="test/AttributedDI.SourceGenerator.UnitTests/AttributedDI.SourceGenerator.UnitTests.csproj" />
+    <Project
+      Path="test/AttributedDI.SourceGenerator.UnitTests/AttributedDI.SourceGenerator.UnitTests.csproj" />
   </Folder>
-  <Folder Name="/test/assets/">
-    <Project Path="test/assets/AllModulesRegistration.App/AllModulesRegistration.App.csproj" />
-    <Project Path="test/assets/AllModulesRegistration.Core/AllModulesRegistration.Core.csproj" />
-    <Project Path="test/assets/Company.TeamName.Project.API/Company.TeamName.Project.API.csproj" />
-    <Project Path="test/assets/CustomModuleName/CustomModuleName.csproj" />
-    <Project Path="test/assets/GeneratedInterfacesSut/GeneratedInterfacesSut.csproj" />
-    <Project Path="test/assets/GenerateExtensions.OptIn/GenerateExtensions.OptIn.csproj" />
-    <Project Path="test/assets/GenerateExtensions.OptOut/GenerateExtensions.OptOut.csproj" />
-    <File Path="test/assets/.editorconfig" />
-    <File Path="test/assets/Directory.Build.props" />
+  <Folder Name="/test/integration/">
+    <Project
+      Path="test/integration/AttributedDI.IntegrationTests/AttributedDI.IntegrationTests.csproj" />
+    <File Path="test/integration/nuget.config" />
+  </Folder>
+  <Folder Name="/test/integration/assets/">
+    <Project
+      Path="test/integration/assets/AllModulesRegistration.App/AllModulesRegistration.App.csproj" />
+    <Project
+      Path="test/integration/assets/AllModulesRegistration.Core/AllModulesRegistration.Core.csproj" />
+    <Project
+      Path="test/integration/assets/Company.TeamName.Project.API/Company.TeamName.Project.API.csproj" />
+    <Project Path="test/integration/assets/CustomModuleName/CustomModuleName.csproj" />
+    <Project Path="test/integration/assets/GeneratedInterfacesSut/GeneratedInterfacesSut.csproj" />
+    <File Path="test/integration/assets/.editorconfig" />
+    <File Path="test/integration/assets/Directory.Build.props" />
+  </Folder>
+  <Folder Name="/test/e2e/">
+    <File Path="test/e2e/run-e2e-tests" />
   </Folder>
 </Solution>

AGENTS.md

@@ -0,0 +1,37 @@
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+using System;
+using System.Text;
+
+namespace AttributedDI.SourceGenerator;
+
+internal static class GeneratedAttributesInitializer
+{
+    private const string GeneratedModuleAttributeSource = """
+// <auto-generated/>
+#nullable enable
+
+namespace AttributedDI.Generated.Internal
+{
+    /// <summary>
+    /// Marks a generated service module to enable discovery by AttributedDI's source generator.
+    /// </summary>
+    [global::Microsoft.CodeAnalysis.Embedded]
+    [global::System.AttributeUsage(global::System.AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    internal sealed class GeneratedModuleAttribute : global::System.Attribute
+    {
+    }
+}
+""";
+
+    public static void EmbedGeneratedAttributes(IncrementalGeneratorInitializationContext context)
+    {
+        context.RegisterPostInitializationOutput(static postInitializationContext =>
+        {
+            postInitializationContext.AddEmbeddedAttributeDefinition();
+            postInitializationContext.AddSource(
+                "AttributedDI.Generated.Internal.GeneratedModuleAttribute.g.cs",
+                SourceText.From(GeneratedModuleAttributeSource, Encoding.UTF8));
+        });
+    }
+}