[release/6.0] run System.IO.Tests .NET 5 compat tests on every OS #58613
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Backport of #58611 to release/6.0
/cc @adamsitnik
Customer Impact
In .NET 6, we have re-written FileStream. Initially, we have done that only for Windows, hence
Net5Compat.Tests
projects were targetting only$(NetCoreAppCurrent)-windows
. When we have added new Unix implementation in #55191, we forgot to enable these tests for Unix.This PR enables
System.IO
tests to test the old, .NET 5 Compat mode on Unix.Testing
The tests are passing.
Risk
None, it's not a product change. It's actually lowering riks of introducing a bug to the .NET 5 Compat mode
FileStream
implementation