Improve Symbol Resolution in TestHost

[davidfowl]

Found this being used in roslyn http://www.nuget.org/packages/Microsoft.DiaSymReader/1.0.4-rc2

/cc @rynowak

[rynowak]

Will take a look. Looks like it's just the COM definitions for https://msdn.microsoft.com/en-us/library/ms233503(v=vs.110).aspx

Will take a look at how they're using it and see if it can address the gaps in our current story.

[Eilon]

The real problem here is supporting symbol line info for test cases that use async, iterators, or inherited tests.

We hope that using DiaSymReader or MetadataReader will solve this problem but we're not sure.

[rynowak]

We ended up not needing MetadataReader to do this. All the info we need is available trivially using reflection.

[rynowak]

1941681 8dd3a13

[gulbanana]

this problem is still happening for me in 1.0/rtm when there is an async test in a base class.

[rynowak]

@gulbanana - please open a new issue on https://github.com/dotnet/cli - they own this functionality now.

[gulbanana]

ok