Code coverage shows line- 0 of n covered

[NayanPanchal3]

I'm using Microsoft.CodeCoverage 17.14.1 and running the tests on Azure DevOps pipeline using the VSTest@2 task.
The CodeCoverage report is getting generated, and assemblies with the respective PDB's are present in the same directory.

The Target platform of test projects is .NET Framework v481, and tests are written in C# and have DLLs as test assemblies.
I've not added the reference of the Microsoft.NET.Test.Sdk to the test projects and haven't added the props and targets of the same.

The report says 0 lines covered out of n number of coverable lines.

Is it required to add the Microsoft.NET.Test.Sdk reference to my test projects to get the code coverage stuff working?
Is Microsoft.CodeCoverage 17.14.1 capable of covering the C# test assemblies' code coverage?

Does it need to have all PDB files on which test assemblies have references?, I mean the projects on which tests are being performed using test projects?

Logs.zip

[fhnaseer]

I would suggest to run this locally with vstest.console.exe and see if get any coverage or not.

vstest.console.exe testproject.dll /diag:log.vstest.txt /EnableCodeCoverage

If you don't get any coverage, then please share logs with us.

[NayanPanchal3]

Hi, have run the tests locally and here are the logs, in the log it says
"datacollector.exe, AssemblyResolver.OnResolve: System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a: File exists but version/public key is wrong. Try next extension."

datacollector.exe, ReportGenerator.LoadModule: name:\ConcreteDesignCenter.UnitTests.dll, skipReason:instrumentation_failure, detailed reason:System.TypeInitializationException: The type initializer for 'PerTypeValues`1' threw an exception. ---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

In the same folder where DLL is System.Runtime.CompilerServices.Unsafe.dll, Version=6.0.0.0 is present

Local.zip

[NayanPanchal3]

I've downloaded the microsoft.testplatform.17.14.1 nuget on local system and tried running the tests from vstest.console.exe from \microsoft.testplatform.17.14.1\tools\net462\Common7\IDE\Extensions\TestPlatform, path, with using same RunSettings file which I use for DevOps pipeline and with this version I'm able to get the code coverage with type_name="CommandParserTests" block_coverage="100.00" line_coverage="100.00" blocks_covered="75".

Have tried the same settings on the DevOps pipeline and in logs it fails with vstest.console.exe, TestRunAttachmentsProcessingManager: Exception in ProcessAttachmentsAsync: System.TypeInitializationException: The type initializer for 'Microsoft.VisualStudio.Coverage.CodeCoverageDataAttachmentsHandler' threw an exception. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.CodeCoverage.Core, Version=17.14.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
at Microsoft.VisualStudio.Coverage.CodeCoverageDataAttachmentsHandler..cctor()

2025.7.17.05.zip

[fhnaseer]

I've downloaded the microsoft.testplatform.17.14.1 nuget on local system and tried running the tests from vstest.console.exe from \microsoft.testplatform.17.14.1\tools\net462\Common7\IDE\Extensions\TestPlatform, path, with using same RunSettings file which I use for DevOps pipeline and with this version I'm able to get the code coverage with type_name="CommandParserTests" block_coverage="100.00" line_coverage="100.00" blocks_covered="75".

Have tried the same settings on the DevOps pipeline and in logs it fails with vstest.console.exe, TestRunAttachmentsProcessingManager: Exception in ProcessAttachmentsAsync: System.TypeInitializationException: The type initializer for 'Microsoft.VisualStudio.Coverage.CodeCoverageDataAttachmentsHandler' threw an exception. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.CodeCoverage.Core, Version=17.14.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. at Microsoft.VisualStudio.Coverage.CodeCoverageDataAttachmentsHandler..cctor()

2025.7.17.05.zip

Thanks for trying it out locally. It seems like issue with AzDO VSTest plugin. Can you please create an issue over here? https://developercommunity.visualstudio.com/AzureDevOps

[NayanPanchal3]

I've created an issue on DevOps.
For the information, there is an also failure of,
datacollector.exe, ReportGenerator.LoadModule: name:C:\Windows\Microsoft.Net\assembly\GAC_64\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.Wrapper.dll, skipReason:instrumentation_failure, detailed reason:System.InvalidOperationException: Metadata image doesn’t represent an assembly.
at System.Reflection.Metadata.MetadataReader.GetAssemblyDefinition()
at Microsoft.CodeCoverage.Instrumentation.Metadata.AssemblyMetadataFactory.IsExcludedByConfig(String path, MetadataReader metadataReader, String& configuration, Boolean& hasSecurityAttributes)
at Microsoft.CodeCoverage.Instrumentation.Metadata.AssemblyMetadataFactory.d__8.MoveNext()
at System.Reflection.Metadata.MetadataReader.GetAssemblyDefinition()
at Microsoft.CodeCoverage.Instrumentation.Metadata.AssemblyMetadataFactory.IsExcludedByConfig(String path, MetadataReader metadataReader, String& configuration, Boolean& hasSecurityAttributes)
at Microsoft.CodeCoverage.Instrumentation.Metadata.AssemblyMetadataFactory.d__8.MoveNext()