$(RunCommand) quoting

Is `$(RunCommand)` supposed to be the path to an executable, or just a general shell-executed string to run?

This matters, because it determines whether `$(RunCommand)` must be quoted if it contains spaces (or other shell-interpreted characters).

The Run target uses MSBuild's Exec task:

https://github.com/dotnet/sdk/blob/b489ab2a02e2914ff70eb69736e96df1cb12a92f/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets#L1462-L1465

which means that according to this implementation, `$(RunCommand)` is a general shell-executed string, and if something needs quoting, the `$(RunCommand)` variable must contain those quotes.

However, `dotnet test` passes `$(RunCommand` directly to `Process.Start()`:

https://github.com/dotnet/sdk/blob/b489ab2a02e2914ff70eb69736e96df1cb12a92f/src/Cli/dotnet/Commands/Test/MTP/TestApplication.cs#L160

and if this is how it's supposed to be, then `$(RunCommand)` is the path to an executable on disk, and _must not be quoted_.

So which is it?

And then the wrong implementation would need to be updated to follow the spec.

Start by reading the Run target in src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets and the Process.Start call in src/Cli/dotnet/Commands/Test/MTP/TestApplication.cs. Trace the expected $(RunCommand) contract and check related tests or documentation. Done means the quoting behavior is specified and both paths consistently follow it.

Written by the indexing model from the issue text.