MSTest v4 Breaking Changes

[Evangelink]

Description

The goal of this ticket is to announce the upcoming breaking changes in MSTest v4.

Planned

• [ ] Convert MSTest to async pattern (#1284)
• [ ] Caller argument expression (#1154)
• [x] Disable appdomain usage by default (#1297)
• [x] Change ClassCleanup default behavior to be "EndOfClass" (#1316)
• [x] Remove ClassCleanupBehavior.EndOfAssembly (#1574)
• [ ] Drop TestTimeout enum and related overload on TimeoutAttribute (#1317)
• [x] Update TestContext.Properties return type to IDictionary<string, object> (#1377)
• [x] Remove deprecated BeginTimer and EndTimer methods (#1454)
• [x] Deprecate TestContext properties kept for compatibility (#1453)
• [ ] Better DisplayName for data tests (#713)
• [x] Unify SetOutcome behavior across all target frameworks (#1426)
• [ ] Deprecate ExpectedExceptionAttribute (#135)
• [ ] Simpify assembly names to improve 260 chars limitation (#1607)
• [ ] Disable CaptureTraceOutput by default (linked issue https://github.com/microsoft/testfx/issues/2616)

To be discussed

• [ ] Reintroduce tree structure (InnerResults) for parameterized tests (#1024)
• [ ] Use a better serialization/deserialization mechanism for data discovery (#1462)
• [ ] DataRow: Nulls and empty string are displayed as no data in display name (#1647)

[Nirmal4G]

I also propose a new Shared Framework of testing tools and frameworks in .NET SDK along with a new Test SDK for the Project (not just a simple rename as requested in #2693). May be not for v4 but for v5 maybe? .NET 10? Basically, a built-in Testing support from the .NET SDK without any external dependencies.

See #3254 for the proposal and discussion.