Not able to render Code Coverage HTML results in the "Code Coverage" tab in Azure DevOps

Question

I have a classic build pipeline in Azure DevOps that builds and run tests for a .Net Core 3.1 app. I am using self-hosted build agents running Windows Server 2019 OS

Below is the pipeline screenshot

My tasks:

1. Restore Nuget
2. Build the solution in release mode
3. Install latest vstest.console.exe tool
4. Run tests using above tool and generate .coverage file
5. Install CodeCoverage.exe from Nuget
6. PowerShell script to convert .coverage to .xml
7. Using ReportGenerator task to generate HTML and Cobertura (HTMLInline;HTMLChart;Cobertura)
8. Publish the code coverage results to the server using Cobertura.xml from step 7 and also uploading HTML report folder

Publish Code Coverage Task The HTML report directory is generated by ReportGenerator task.

Build runs successfully Publish Code Coverage task log

Build run summary

Published files by the build

Code Coverage tab

Issue: The code coverage tab does not display the HTML reports

Answer 1

This is a known issue on Azure devops. Now, we could only download the report, and open it with Visual Studio.

Azure devops only support the download link for .coverage files currently. The white page you see is a UI glitch. This scenario is only supposed to render a download link to the coverage file.

Besides, this issue has been submitted in this earlier suggestion ticket linked here: support vstest .coverage "code coverage" build results tab

This feature request is On Roadmap, I believe it will be released soon, you can follow this thread to know its latest feedback.

In addition, I found a similar case and I have tested via the answer, set the code coverage tool to Cobertura, then I get the code coverage report in the Azure DevOps pipeline.