Exception: The process cannot access file because it is being used by another process

[xJom]

Running a test, where UUT has an explicit dependency to an Interface-dll, and the test has an implicit dependency to the same Interface-dll, the data collector cannot access this dll, after calculating coverage.

I have tried the 1.2.0 as well as the latest 3.0.0-preview.9 (for both coverlet.msbuild and coverlet.collector).

The command I run has been enhanced with all previous tips in #857 :
dotnet test /nodeReuse:false -m:1 .\XUnit.Coverlet.Collector.csproj /p:ParallelizeTestCollections=false /p:CopyLocalLockFileAssemblies=true /p:ExcludeFromCodeCoverage=MessageFormatInterface --collect:"XPlat Code Coverage"

The inner exception is repeated 9 times, so I only report the last here: 18:12:35 ---> (Inner Exception #9) System.IO.IOException: The process cannot access the file 'C:\Jenkins\workspace\SharedUI\SharedUI-develop_builder\UnitTests\XUnit.Coverlet.Collector\bin\Debug\netcoreapp3.1\MessageFormatInterface.dll' because it is being used by another process. 18:12:35 at System.IO.FileSystem.CopyFile(String sourceFullPath, String destFullPath, Boolean overwrite) 18:12:35 at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite) 18:12:35 at Coverlet.Core.Helpers.FileSystem.Copy(String sourceFileName, String destFileName, Boolean overwrite) in D:\git\coverletToRelease\src\coverlet.core\Helpers\FileSystem.cs:line 33 18:12:35 at Coverlet.Core.Helpers.InstrumentationHelper.<>c__DisplayClass9_0.<RestoreOriginalModule>b__0() in D:\git\coverletToRelease\src\coverlet.core\Helpers\InstrumentationHelper.cs:line 214 18:12:35 at Coverlet.Core.Helpers.RetryHelper.<>c__DisplayClass0_0.<Retry>b__0() in D:\git\coverletToRelease\src\coverlet.core\Helpers\RetryHelper.cs:line 26 18:12:35 at Coverlet.Core.Helpers.RetryHelper.Do[T](Func1 action, Func1 backoffStrategy, Int32 maxAttemptCount) in D:\git\coverletToRelease\src\coverlet.core\Helpers\RetryHelper.cs:line 52<--- 18:12:35 18:12:35 --- End of inner exception stack trace --- 18:12:35 at Coverlet.Collector.DataCollection.CoverageManager.InstrumentModules() in D:\git\coverletToRelease\src\coverlet.collector\DataCollection\CoverageManager.cs:line 68 18:12:35 at Coverlet.Collector.DataCollection.CoverletCoverageCollector.OnSessionStart(Object sender, SessionStartEventArgs sessionStartEventArgs) in D:\git\coverletToRelease\src\coverlet.collector\DataCollection\CoverletCoverageCollector.cs:line 127.

[MarcoRossignoli]

To filter out that asm you need to use a runsetting file for collectors, take a look at guide

https://github.com/coverlet-coverage/coverlet/blob/master/Documentation/VSTestIntegration.md#advanced-options-supported-via-runsettings

<?xml version="1.0" encoding="utf-8" ?>
<RunSettings>
  <DataCollectionRunSettings>
    <DataCollectors>
      <DataCollector friendlyName="XPlat code coverage">
        <Configuration>
          <Format>cobertura</Format>          
          <Exclude>[MessageFormatInterface]*</Exclude>
        </Configuration>
      </DataCollector>
    </DataCollectors>
  </DataCollectionRunSettings>
</RunSettings>

Please enable also the logging so we can take a look at filtered dll https://github.com/coverlet-coverage/coverlet/blob/master/Documentation/Troubleshooting.md#collectors-integration

[xJom]

Yes!
That worked. (And it works with 2.9.1 and 3.0.0-preview.9 both.)
Thank you very much.

[MarcoRossignoli]

Glad to hear that!