Allow [ExcludeFromCodeCoverageAttribute] to be used on assembly level

[abatishchev]

(Migrated from microsoft/testfx#248, hope this is the right place to ask this time).

Since this attribute has the following signature:

[AttributeUsageAttribute
    (AttributeTargets.Class |
     AttributeTargets.Struct |
     AttributeTargets.Constructor |
     AttributeTargets.Method |
     AttributeTargets.Property |
     AttributeTargets.Event,
     Inherited = false, AllowMultiple = false)]
public sealed class ExcludeFromCodeCoverageAttribute : Attribute

one can't use it to annotate whole assembly, effectively making it inconvenient and rarely used. And ends up messing up with Run Settings.

[pvlakshm]

Indeed, the attribute cannot be applied at the assembly level. That idea is being tracked here: corefx #14488.

You can already exclude assemblies from participating via a .runsettings file. See here for details: MSDN: Customizing Code Coverage Analysis.

[devlie]

@pvlakshm The attribute can now be specified at assembly level, but seems like VSTest still has not respected it yet. Is there any plan to enable that?

[Evangelink]

Reopening the issue as assembly level is not yet supported.

[fhnaseer]

It seems like this attribute is not supported at assembly level for .net framework but is supported for .net core. https://source.dot.net/#System.Private.CoreLib/ExcludeFromCodeCoverageAttribute.cs,b968c01782a640bc. Need to see if code coverage is disabled for .net core projects when this attribute is used.

[Evangelink]

Sorry I have been reading things too quickly... This one was correctly fixed, I should be transferring the related issue from testfx to this repo instead.