Publisher makes 2 HTML reports on azure with PublishCodeCoverageResults@2. This makes it slow with large coverage data.

[pavelliavonau]

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

[mdkieferbp]

I have noticed this same issue. With more than 1400 files, it REALLY slows things down a lot. At first I thought it was because it was detecting 2 identical .cobertura.xml files in different folders, but even when I fixed that using the code below the duplicate file generate still occurred:

      - task: PublishCodeCoverageResults@2
        displayName: 'Publish code coverage results'
        inputs:
          # don't use "CoverageResults\**\*cobertura.xml" as it will find duplicate files in the output tree and thus take twice as long to publish.
          summaryFileLocation: '$(Build.SourcesDirectory)\CoverageResults\*\*cobertura.xml'
          failIfCoverageEmpty: 'false'