Migrate FSharpQA suite to xUnit suite(s)

[vzarytovskii]

We want to migrate FSharpQA tests from a custom runner/solution to a standard dotnet test project(s).

• Tests have to be migrated to one of following:
  • FSharp.Compiler.ComponentTests - if it's a "blackbox"-style test for the compiler, when we want to check compiler output itself, e.g. IL generation, compiler errors and warnings tests, conformance tests, etc.
  • FSharp.Compiler.UnitTests - if it's a test for a compiler "API".
  • FSharp.Core.UnitTests - if it's a test for library functions.

Prerequisite: #10000

[dsyme]

FSharp.Compiler.ComponentTests - if it's a "blackbox"-style test for the compiler, when we want to check compiler output itself, e.g. IL generation, compiler errors and warnings tests, conformance tests, etc.

FSharp.Compiler.UnitTests - if it's a test for a compiler "API".

I find these names a bit confusing ComponentTests sounds like Unit Tests to me.

Maybe aim for this:

• FSharp.Core.UnitTests // tests for FSharp.Core

• FSharp.Compiler.UnitTests // unit tests for FSharp.Compiler and FSharp.Compiler.Service

• FSharp.Compiler.UsageTests // tests actual usage of language and tools

• VisualFSharp....UnitTests // tests for anything involving Visual Studio, Roslyn

So basically rename "ComponentTests" to "UsageTests"

[vzarytovskii]

I find these names a bit confusing ComponentTests sounds like Unit Tests to me.

My idea was that we test compiler as an "external", separate "component", hence the category "ComponentTests".

We already have this project, renaming it should be easy though.

[cartermp]

Should "UsageTests" just be "LanguageTests"? Since that's basically what they are. Tooling tests would go under relevant tooling subfolders anyways

[vzarytovskii]

Should "UsageTests" just be "LanguageTests"? Since that's basically what they are. Tooling tests would go under relevant tooling subfolders anyways

Keep in mind, that currently, there are not only "Language" tests there, but also stuff like IL verification, Interop, I guess if it falls under "LanguageTests", then I guess, we can have it as "LanguageTests"

[dsyme]

Now covered by #12823