Instrumenting ASP.NET Core Views.dll takes >20 minutes

On both Azure DevOps and GitHub Actions I am coming across the same issue. Since upgrading to ASP.NET Core 3.1, calling the following code takes over 20 minutes to execute, and will often cause the build to fail due to timeout:

dotnet test --configuration Release /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura /p:Exclude="[ActionsTest.Views.dll]*%2c[xunit.*]*"

The Solution contains one ASP.NET Core 3.1 application, and a number of .Net Standard 2.0 class libraries. By running dotnet test on each project individually, it is only the ASP.Net Core project that takes so long (all the others take a reasonable length of time to complete, a few seconds to 1-2 minutes for a large one).

By setting the verbose flag, I can see that the line that takes to long is the second line (I’ve added the previous line to show the timestamp):

Mon, 16 Mar 2020 15:25:11 GMT
[coverlet] Instrumented module: 'D:\a\ActionsTest\ActionsTest\tests\ActionsTest.Test\bin\Debug\netcoreapp3.1\ActionsTest.dll'
Mon, 16 Mar 2020 15:49:44 GMT
[coverlet] Instrumented module: 'D:\a\ActionsTest\ActionsTest\tests\ActionsTest.Test\bin\Debug\netcoreapp3.1\ActionsTest.Views.dll'

It seems that

1. the Exclude parameter isn’t excluding the ActionsTest.Views.dll assembly, and
2. Instrumenting *.Views.dll takes a huge amount of time

Please let me know if you need any more information.

[nheath99]

1. My mistake, it was a typo (I missed the final quote ")
2. Yes I was aware of this, I was just surprised that the length of time to cover a ASP.Net core 3.1 was significantly higher than before, and other .net core projects - I do not have many loops or particularly slow code, maybe I can have a look at this in the future.
3. Yes you are right, I get the expected coverage file at the end.

PS thank you for your work on this project, it’s really appreciated 🙂 PPS I hope the current situation in Italy improves soon! 🙏

[MarcoRossignoli]

PS thank you for your work on this project, it’s really appreciated 🙂

Thank’s for patience and for using coverlet

PPS I hope the current situation in Italy improves soon!

Thank’s we’re fighting, we’ll make it!