René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BUG] Missing Coverage after moving to MTP","articleBody":"**Describe the bug**\nAfter moving to coverlet.MTP from coverlet.msbuild (with xUnit) our coverage has dropped significantly using the opencover format.\n\n**To Reproduce**\n\nGenerating an opencover report using the older VSTest system and again using MTP version yields notably less entries in resulting file without other code changes.\n\n**Expected behavior**\n\nIdentical coverage results between coverlet.msbuild and coverlet.MTP with the same code / setup.\n\n**Actual behavior**\n\nMTP opencover results file has about 35% of the files the MSBuild version of the package does.\n\n**Configuration (please complete the following information):**\n\nFor VSTest:\n* coverlet.msbuild v8.0.0\n* Microsoft.NET.Test.Sdk v18.0.1\n* xunit.v3 v3.2.2\n* xunit.runner.visualstudio v3.1.5\n\nFor MTP:\n* coverlet.MTP v8.0.0\n* Microsoft.Testing.Platform v2.1.0\n* xunit.v3.mtp-v2 v3.2.2\n\nBoth running on .Net 10, issues present via azure pipeline running ubuntu-latest and locally on Windows 11.\n\n**Additional context**\n\nCommand run for VSTest on windows:\n\n`dotnet test \u003cProject\u003e --configuration \u003cConfig\u003e --nologo /p:SingleHit=true /p:CollectCoverage=true /p:CoverletOutputFormat=opencover   `\n\nSummary header of VSTest opencover result:\n\n`\u003cSummary numSequencePoints=\"25080\" visitedSequencePoints=\"1346\" numBranchPoints=\"1970\" visitedBranchPoints=\"172\" sequenceCoverage=\"5.36\" branchCoverage=\"8.73\" maxCyclomaticComplexity=\"5097\" minCyclomaticComplexity=\"242\" visitedClasses=\"215\" numClasses=\"607\" visitedMethods=\"446\" numMethods=\"6914\" /\u003e`\n\nCommand run for MTP on windows:\n\n`dotnet test --project \u003cProject\u003e --configuration \u003cConfig\u003e --report-xunit-trx --coverlet --coverlet-output-format opencover --coverlet-include \u003cOwn Modules\u003e --coverlet-single-hit`\n\nSummary header for MTP opencover result:\n\n`\u003cSummary numSequencePoints=\"2596\" visitedSequencePoints=\"399\" numBranchPoints=\"808\" visitedBranchPoints=\"51\" sequenceCoverage=\"15.36\" branchCoverage=\"6.31\" maxCyclomaticComplexity=\"467\" minCyclomaticComplexity=\"11\" visitedClasses=\"79\" numClasses=\"226\" visitedMethods=\"112\" numMethods=\"624\" /\u003e`\n\nIf there is anything you need from me to test or more info let me know.\n\nSame behaviour when running using `--solution`, the logs indicate the module is being instrumented but not picking up all the files.","author":{"url":"https://github.com/mellis-ao","@type":"Person","name":"mellis-ao"},"datePublished":"2026-03-18T23:22:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/1843/coverlet/issues/1843"}