[mono] Add functional tests for the supported platforms

[MaximLipnin]

Part of #43865

The functional tests:

• live under src/tests/FunctionalTests directory.
• are built as a part of the library tests build.
• are isolated from the build/test setup used for the tests in src/tests
• run on CI
• are extracted into individual test cases:
• iOS/tvOS device + simulator
  • Interpreter only
  • AOT only
• Android device + emulator
  • Interpreter only
  • AOT only - waiting for Initial Android cross-compiler #43535
• WebAssembly - in progress
  • Interpreter only
  • AOT only

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Issue Details

---

Part of #43865

• iOS/tvOS device + simulator - in progress
  • Interpreter only
  • AOT only
• Android device + simulator - TODO
  • Interpreter only
  • AOT only
• WebAssembly - TODO
  • Interpreter only
  • AOT only

Author:	MaximLipnin
Assignees:	-
Labels:	area-System.Net
Milestone:	-

[MaximLipnin]

Putting the functional tests under src/tests leads to some issues like unrelated test setup (restoring the packages etc), for ex:

/Users/runner/.dotnet/sdk/5.0.101/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(241,5): error NETSDK1004: (NETCORE_ENGINEERING_TELEMETRY=Build) Assets file '/Users/runner/work/1/s/artifacts/tests/coreclr/packages/Common/test_dependencies/test_dependencies/project.assets.json' not found. Run a NuGet package restore to generate this file.

It has to be adjusted in some way.

[mdh1418]

Many *.cs files are copies but in different folders. Is it possible/reasonable to just compile the same file as part of

<ItemGroup>
  <Compile Include="<filepath>" />
</ItemGroup>

To not need all the duplicate copies of *.cs files? Do we anticipate any modifications that would differentiate the different *.cs files between Interpreter and AOT?

[MaximLipnin]

Many *.cs files are copies but in different folders. Is it possible/reasonable to just compile the same file as part of

<ItemGroup>
  <Compile Include="<filepath>" />
</ItemGroup>

To not need all the duplicate copies of *.cs files? Do we anticipate any modifications that would differentiate the different *.cs files between Interpreter and AOT?

Thanks, it sounds reasonable to avoid duplication in the source code. But I'm not sure what those test are going to be like after all, so for the sake of simplicity I'd prefer to have its own source for every particular test for now.

[steveisok]

This should be in a common targets like the other platforms.

[steveisok]

We could have this in a common to all platforms targets file and then just set a property in each project with whatever the PackageDirectory value is. Feels nit picky though.

[steveisok]

Outside of a couple small nits, looks good. I would add Android AOT in a follow up PR.

[mdh1418]

Looks good to me!

[steveisok]

I think my comments can be addressed in a follow up PR.

[danmoseley]

cc @eerhardt fyi

[ViktorHofer]

Just noticed that we have these functional tests under src/tests but run them as part of the libraries test build:

live under src/tests/FunctionalTests directory.
are built as a part of the library tests build.
are isolated from the build/test setup used for the tests in src/tests

What was the reason for not just moving them into src/libraries?

[akoeplinger]

@ViktorHofer as far as I can remember the plan was to untangle the dependency on the libraries test infra but it apparently never happened :)