In our Azure DevOps pipeline the coverage report is generated and published by the PublishCodeCoverageResults@1 task from a cobertura.xml file. Unfortunately the generated html report is not accurate as it does not visualize yield return rows, async methods and possibly others as covered. According to the cobertura.xml file they are covered. After investigation I found that it could be a bug in ReportGenerator that has been fixed meanwhile as the latest version (5.1.5 at the time of writing) shows these parts properly.

I found that coverage publisher has unexpected behaviour in my case. My log at azuredevops PublishCodeCoverageResults@2 is following:

...
Found 1 result(s) matching pattern: F:\agent1\_work\2\TestResults\*\*.cobertura.xml
F:\agent1\_work\2\TestResults\3e4306b4-f889-4e26-91b6-ccef258d7ca8\unittest.mytest.cobertura.xml
...
##[debug]ReportGeneratorTool.ParseCoverageFiles: Parsing coverage files.
...
2024-01-12T18:27:17: Finished parsing 'F:\agent1\_work\2\TestResults\3e4306b4-f889-4e26-91b6-ccef258d7ca8\unittest.mytest.cobertura.xml' 1/1
2024-01-12T18:27:17: Parsing of 1 files completed
2024-01-12T18:27:17: Starting merging result 1
2024-01-12T18:27:17: Finished merging result 1
##[debug]ReportGeneratorTool.CreateHTMLReportFromParserResult: Creating HTML report.
2024-01-12T18:27:18: Initializing report builders for report types: HtmlInline_AzurePipelines
2024-01-12T18:27:18: Analyzing 249 classes
...
##[debug]Parser.GenerateHTMLReport: Creating summary file directory: F:\agent1\_work\_temp\ff13e3f5-e245-48a5-ab0c-07e0e60a6528\Summary_ec27501f
##[debug]Parser.GenerateHTMLReport: Copying summary file F:\agent1\_work\2\TestResults\3e4306b4-f889-4e26-91b6-ccef258d7ca8\unittest.mytest.cobertura.xml
##[debug]PERF : Parser.ReportGeneration : took 7079.4571 ms.
##[debug]ReportGeneratorTool.GetFileCoverageInfos: Generating file coverage info from coverage files.
##[debug]ReportGeneratorTool.CreateHTMLReportFromParserResult: Creating HTML report.
2024-01-12T18:27:24: Initializing report builders for report types: HtmlInline_AzurePipelines
2024-01-12T18:27:24: Analyzing 249 classes
...
2024-01-12T18:27:28: Creating summary
2024-01-12T18:27:28: Writing report file 'F:\agent1\_work\_temp\ff13e3f5-e245-48a5-ab0c-07e0e60a6528\index.html'
##[debug]Parser.GenerateHTMLReport: Creating summary file directory: F:\agent1\_work\_temp\ff13e3f5-e245-48a5-ab0c-07e0e60a6528\Summary_fb1344ea
##[debug]Parser.GenerateHTMLReport: Copying summary file F:\agent1\_work\2\TestResults\3e4306b4-f889-4e26-91b6-ccef258d7ca8\unittest.mytest.cobertura.xml
##[debug]PERF : Parser.ReportGeneration : took 4310.1144 ms.
##[debug]ReportGeneratorTool.GetCoverageSummary: Generating coverage summary for the coverage files.
##[debug]Publishing code coverage summary supported
Publishing coverage summary data.
...

As a result I have 2 summary folders published with the same coverage files.

I guess the first call of GenerateHTMLReport is redundant and should not be called.

Version:

Task         : Publish code coverage results v2
Description  : Publish any of the code coverage results from a build
Version      : 2.231.0

There are important files that Microsoft projects should all have that are not present in this repository. A pull request has been opened to add the missing file(s). When the pr is merged this issue will be closed automatically.

Microsoft teams can learn more about this effort and share feedback within the open source guidance available internally.

Merge this pull request

Why is only line coverage published?
After parsing a cobertura.xml for example there is totalBranches and coveredBranches. These could be added in ReportGeneratorTool.GetCoverageSummary(). The information are there, why don't you send them?

The commit updating the .NET version: 68874da

It was working when the project was on netcoreapp3.1 and started failing to build anytime time 2 PM on 13th April, 2023

To try it out, I installed .NET 6 in my local and ran on it, but still the same error.

Possible solutions:

• Move to .NET7  #54
• Set selfContained to false #55
• Revert to prev netcore3.* until proper fix it found.

Does anyone know of a resource or tool that integrates with ReportGenerator output to chart (overall) code coverage over time for a pipeline, as opposed to calculating it for a given build in a pipeline?

https://support.google.com/photos/answer/6153599

In my pipeline, I have started getting this message and hence want to move to supported version to .NET 7 or 6 as per https://dotnet.microsoft.com/en-us/platform/support/policy/dotnet-core
/Users/runner/.dotnet/sdk/7.0.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.1' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/Users/runner/CoveragePublisher/azure-pipelines-coveragepublisher/src/CoveragePublisher.Console/CoveragePublisher.Console.csproj::TargetFramework=netcoreapp2.1]

The readme and yml both mentions .NET 2.0 https://github.com/microsoft/azure-pipelines-coveragepublisher#usage

In my pipeline, I have coverage.xml of cobertura style using reportgenerator
which has hyperlinks to visualize the missing coverage in actual code files.

Example:

Problem

When I enable diff coverage using CoveragePublisher and azurepipelines-coverage.yml file. I start seeing a different report which is not useful for my case because it doesn't have the navigation feature to the visuals.

In both the cases, I'm explicitly publishing at the end and also the right Html with index.html are produced properly (I can find them in the artifacts)
Expecting the same index.html to be linked on the Code Coverage tab. What am I missing? Because it works as expected without using CoveragePublisher (this repo's diff coverage)

Possible reason: I'm guessing somewhere call to https://github.com/microsoft/azure-pipelines-coveragepublisher/blob/master/src/CoveragePublisher/Publishers/DefaultPublisher/HtmlReportPublisher.cs is overriding the behavior.

How can I make the Code Coverage pick the index.html from the Code Coverage_Report folder?

Expected

1. Desire to get the ReporterGenerator report (as per the first screenshot) after enabling codeocveragepublsher's diff coverage comment on.

2. Also a query:
   In general, how doe the "Code Coverage" tab work? which file and which path it tries to look at? And what settings can change it's behaviour?

PS. With Visuals I mean, the highlights on actual code with what's not covered or covered. Example below are the screenshots I get on clicking on any of the classname in the first desired report.