Prefer 'Assert.ThrowsExactly/ThrowsExactlyAsync' over '[ExpectedException]' (https://learn.microsoft.com/dotnet/core/testing/mstest-analyzers/mstest0006)

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

Unreachable code detected

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

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