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.Net C# NLog UnitTests

Code Coverage in .Net 2023

In the past, I have written a blog post about code coverage using NUnit, OpenCover and ReportGenerator https://www.alightservices.com/2022/06/23/code-coverage-in-net/.

OpenCover development has stopped for over 2 years.

This blog post talks about another tool known as Coverlet.

This blog posts has a accompanying Github repo – https://github.com/ALightTechnologyAndServicesLimited/CodeCoverage/

The code has 4 methods regarding DateTime class. And 3 helper methods:

  • double GetUnixEpoch(DateTime)
  • DateTime GetDateTimeFromUnixEpoch(double)
  • long GetYYYMMDD(DateTime)
  • bool IsLeapYear(int)

There are 9 unit tests for the above mentioned 4 methods.

The batch file – RunCodeCoverage.bat has the commands.

The usage is very simple, add the Coverlet nuget package, install the ReportGenerator tool and run some commands. Navigate to the unittest project.

dotnet add package coverlet.collector

dotnet tool install -g dotnet-reportgenerator-globaltool

The nuget package coverlet.collector needs to be added for every unit test project. The reportgenerator can be installed once.

Then run this command for invoking coverlet:

dotnet test --collect:"XPlat Code Coverage"

This generates a xml file under TestResults/[some-random-guid].

This xml file would be used by reportgenerator for generating HTML report:

reportgenerator.exe "-reports:TestResults**.*.xml" "-targetdir:report"

The above command looks for xml files under TestResults/* folder and generates HTML reports under report folder.

The HTML report looks like this. If there is any code that was not covered under unit test, those can be seen easily. The following screenshots have 100% code coverage, but if there is any code not covered, the code would be shown in red.

I don’t have any fake aliases, nor any virtual aliases like some of the the psycho spy R&AW traitors of India. NOT associated – “ass”, eass, female “es”, “eka”, “ok”, “okay”, “is”, “erra”, yerra, karan, kamalakar, diwakar, kareem, karan, sowmya, zinnabathuni, bojja srinivas (was a friend and batchmate 1998 – 2002), mukesh golla (was a friend and classmate 1998 – 2002), thota veera, uttam’s, bandhavi’s, bhattaru’s, thota’s, bojja’s, bhattaru’s or Arumilli srinivas or Arumilli uttam (may be they are part of a different Arumilli family – not my family).

Mr. Kanti Kalyan Arumilli

Arumilli Kanti Kalyan, Founder & CEO
Arumilli Kanti Kalyan, Founder & CEO

B.Tech, M.B.A






Founder & CEO, Lead Full-Stack .Net developer

ALight Technology And Services Limited

ALight Technologies USA Inc




Phone / SMS / WhatsApp on the following 3 numbers:

+91-789-362-6688, +1-480-347-6849, +44-07718-273-964

+44-33-3303-1284 (Preferred number if calling from U.K, No WhatsApp)

kantikalyan@gmail.com, kantikalyan@outlook.com, admin@alightservices.com, kantikalyan.arumilli@alightservices.com, KArumilli2020@student.hult.edu, KantiKArumilli@outlook.com and 3 more rarely used email addresses – hardly once or twice a year.