This repository contains Roslyn diagnostic analyzers and code fix providers for the xUnit.net test framework (v2 and v3, including Native AOT). It enforces best practices, detects common anti-patterns (e.g., misuse of Assert methods, serialization issues with theory data, incorrect async handling, and structural problems in test classes), and provides automated code fixes. The codebase is organized around version-aware context classes (XunitContext) that resolve xUnit types and version-specific behavior, allowing a single analyzer to target multiple xUnit versions. It includes a rich test suite using a custom CSharpVerifier base class, building on Microsoft.CodeAnalysis.Testing. The infrastructure is well-abstracted with reusable base classes for analyzers, suppressors, and fix providers, and the project is packaged as a NuGet package automatically referenced by xUnit projects.
PropertyChanged.Fody is a Fody add-in (weaver) and Roslyn source generator that automates the implementation of INotifyPropertyChanged (and optionally INotifyPropertyChanging) for .NET classes. The weaver operates on compiled IL using Mono.Cecil, injecting property change notification code into property setters, while the optional source generator emits boilerplate for partial classes at compile time. The tool supports multiple invocation patterns (event, OnPropertyChanged methods, before/after callbacks), attribute-driven dependency detection ([DependsOn], [AlsoNotifyFor]), equality checks before notifications, and extensible interceptors. Configuration is done via FodyWeavers.xml attributes or custom attributes on classes/properties. The project is mature, well-tested, and widely used (nearly 2000 stars), with extensive test coverage across inheritance, generics, nullable types, F#, and integration with MVVM frameworks like Caliburn.Micro and ReactiveUI.