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Visual Studio Extension for simple coverage visuals
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Visual Studio Extension

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Nuget Dependancy - Coverlet.Core (Fork)

Coverlet Core NuGet Downloads NuGet Downloads

The free and fast Visual Studio 2017 15.8+ code coverage tool built around Coverlet, the best .NET Core coverage tool!

  • REQUIRES 2017 15.8 or later!
  • Use Coverlet to generate .NET Core coverage reports.
  • Install PrestoCoverage to instantly show you which lines were vistied by your tests.

Coverage after tests completed


Using Coverlet file


Multiple coverage results merging



  1. Visual Studio 15.8+ is required. Versions below this will not work.
  2. Install the PrestoCoverage extension
  3. Run coverlet and save all results to c:\coverlet\ (Check tips at the bottom)
  4. PrestoCoverage will load any files that follow the convention of *coverage.json
  5. Visual Studio UI will refresh as files get added, deleted, renamed or udpated.
  6. Coverage files can be for any project/solution and supports miltiple instances of Visual Studio



Some other info

  • File name examples: coverage.json, domain-coverage.json, api-loadbalancer-coverage.json
  • The coverage files can be for any project. The Extension works with multiple opened IDE's - It will only work with the files (Filepaths) that it finds in the coverlet.json and with the current window that you are working with (across several IDE's)
  • Large amounts of files in the coverlet directory may cause some lag during reload process - Please let me know how you get on.
  • Large amounts of tests (in max several files) should not really be much of a problem.
  • Adding, removing or changing files in the directory, will automatically reload the data in the extension but only once you switch a tab or open/close a file in VS
  • If you have ^1 two or more coverage files that overlap with the same file name- and one says there is 0 coverage and another says there is coverage... it could be reported incorrectly as no coverage. I am aware this is an issue but it requires much more time from me to work out how to fix this issue


In the c:\coverlet directory I created a PowerShell Script which I use dotnet test to run tests then the next line is coverlet (assuming you have it installed globally) . I use coverlets --output argument to place the results into this directory with a specific name. Like this I can run multiple tests, with multiple results files and the extension will place the coverage boxes for the appropriate file. So each time I delete the files and rerun the tests my VS should show updated coverage now. Plus coverlet gives you some coverage percentages while running so that is a good metric to try and boost each time.

dotnet test C:\Code\domain\Domain.Tests.Integration\Domain.Tests.Integration.csproj
coverlet  C:\Code\domain\Domain.Tests.Integration\bin\Debug\Domain.Tests.Integration.dll --target "dotnet" --targetargs "test C:\Code\domain\Domain.Tests.Integration --no-build" --output "C:\coverlet\domain-integration-coverage" --format json



  • I made this to help me during my daily work.
  • I am not a "Extensions developer" some things may bot be az they shud beatiful as they should. doh
  • There will be bugs!
  • It is not as user friendly as I would want it.. yet.
  • It is practical for daily use. (Since I use it daily...)
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