The data collector runs the tests and collects the data into an XML file. It can be run by navigating to the test project and then calling:

dotnet test --collect:"XPlat Code Coverage" 

It will generate an XML output file in a TestResults subfolder.

In order to display the results of the tests run in a pretty format, we need to run a report generator. That can be done by navigating to the test project directory and then calling:

reportgenerator -reports:"C:\!Personal\ManagerHelper\ManagerHelperTests\TestResults\<Guid>\coverage.cobertura.xml" -targetdir:"coveragereport" -reporttypes:Html

This will create an HTML page in a coveragereport subfolder.

Resource: https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-code-coverage?tabs=windows