I've noticed that the TestClasses are excluded from compilation. This is likely because they are smart contracts and should not be built on the default dotnet build.

Problem:
By excluding them, the IDEs are not showing auto-complete and other important features. The C# support is not enabled when these files are excluded from compilation:

If the compilation of those files is enabled, dotnet cannot build the project:

Proposed solution:
Move all the test classes into a separate .csproj. In this new project, we could leave compilation enabled and include a post-build step to compile the smart contracts (if needed).