Multiple code coverage reports merged, published, showing no data in Azure DevOps pipeline

Question

I am using ReportGenerator task in my Azure DevOps to merge Cobertura based code coverage reports into one, end up with empty reports in pipeline CodeCoverage tab.

Below is my pipeline with three jobs.

Job1 – uses Windows agent pool1, builds java- (clean compile, test, cobertura:cobertura ), if build success, saves test reports, code coverage reports (only xml) to Azure pipeline artifacts.

Job2 – uses Windows agent pool2, builds .NET core- (restore, test, coverlet reports in Cobertura format), if build success, saves test reports, code coverage reports (only xml) to Azure pipeline artifacts.

Job3 - uses Windows agent pool3, downloads test and multiple coverage reports uploaded from previous jobs, merges all Cobertura reports into one using ReportGenerator. Publish code coverage reports.

But, if I go and see the Code Coverage report tab pipeline, assemblies, classes, files, package names data is there but no coverage data, when I click on a particular package class name it’s empty and showing “ ’/some relative path/ abc.java’ does not exist (any more)”. Please suggest.

Answer 1

ReportGenerator needs the source code in order to create a complete report. There is no way to avoid that.

You need to copy the source code or check it out again in the same directory.

Answer 2

Agree with Daniel's answer. And if you use Microsoft-hosted agents, there are different machines for each job so they don't share same build source directory.

You could try to deploy self-hosted agent and use it in pipeline so all jobs share the same build source directory, and then you don't need to check it out again.