Stryker.NET failed to mutate your project. Please upgrade to MsTest V2.

[cmanners]

I am running Stryker on six projects in the same solution and all configured to use the same version of NUnit (version 3.13.2). Stryker is failing on two of the projects with the following error:

Stryker.NET failed to mutate your project. For more information see the logs 
below:


Please upgrade to MsTest V2. Stryker.NET uses VSTest which does not support 
MsTest V1.

See https://devblogs.microsoft.com/devops/upgrade-to-mstest-v2/ for upgrade 
instructions.

Does anyone have any suggestions on how to resolve this issue? Any help you can provide will be greatly appreciated.

Additional Background

Configuration File

{
  "stryker-config":
  {
    "solution": "sln",
    "project": "Shared.csproj",
    "test-projects": ["src/Data.Tests/Data.Tests.csproj", "src/Model.Tests/Model.Tests.csproj", "src/Services.Wcf.Tests/Services.Wcf.Tests.csproj", "src/Shared.Tests/Shared.Tests.csproj", "src/Tasks.Tests/Tasks.Tests.csproj", "src/UI.Web.Tests/UI.Web.Tests.csproj"],
    "ignore-methods": ["Debug.*"],
    "mutation-level": "Complete",
    "reporters": ["html"],
    "verbosity": "debug"
  }
}

Stryker Output

   _____ _              _               _   _ ______ _______  
  / ____| |            | |             | \ | |  ____|__   __| 
 | (___ | |_ _ __ _   _| | _____ _ __  |  \| | |__     | |    
  \___ \| __| '__| | | | |/ / _ \ '__| | . ` |  __|    | |    
  ____) | |_| |  | |_| |   <  __/ |    | |\  | |____   | |    
 |_____/ \__|_|   \__, |_|\_\___|_| (_)|_| \_|______|  |_|    
                   __/ |                                      
                  |___/                                       


[11:39:46 INF] Logging enabled at level Info
Version: 1.5.0

[11:39:46 DBG] Stryker started with options: {"MsBuildPath": null, "DevMode": false, "BasePath": "C:\\agent\\_work\\376\\s", "OutputPath": "C:\\agent\\_work\\376\\s\\StrykerOutput\\2022-03-23.11-39-45", "ReportFileName": "mutation-report", "SolutionPath": "sln", "TargetFramework": null, "LogOptions": {"LogToFile": true, "LogLevel": "Debug", "$type": "LogOptions"}, "MutationLevel": "Complete", "Thresholds": {"High": 80, "Low": 60, "Break": 0, "$type": "Thresholds"}, "AdditionalTimeout": 5000, "LanguageVersion": "Default", "Concurrency": 1, "ProjectUnderTestName": "Shared.csproj", "TestProjects": ["C:\\agent\\_work\\376\\s\\src\\Data.Tests\\Data.Tests.csproj", "C:\\agent\\_work\\376\\s\\src\\Model.Tests\\Model.Tests.csproj", "C:\\agent\\_work\\376\\s\\src\\Services.Wcf.Tests\\Services.Wcf.Tests.csproj", "C:\\agent\\_work\\376\\s\\src\\Shared.Tests\\Shared.Tests.csproj", "C:\\agent\\_work\\376\\s\\src\\Tasks.Tests\\Tasks.Tests.csproj", "C:\\agent\\_work\\376\\s\\src\\UI.Web.Tests\\UI.Web.Tests.csproj"], "TestCaseFilter": "", "WithBaseline": false, "Reporters": ["Html"], "BaselineProvider": "Disk", "AzureFileStorageUrl": "", "AzureFileStorageSas": "", "DashboardUrl": "https://dashboard.stryker-mutator.io", "DashboardApiKey": null, "Since": false, "SinceTarget": "master", "DiffIgnoreChanges": [], "FallbackVersion": "master", "ModuleName": "", "ReportTypeToOpen": null, "Mutate": [{"Glob": {"Tokens": [{"TrailingPathSeparator": {"Value": "\\", "$type": "PathSeparatorToken"}, "LeadingPathSeparator": null, "$type": "WildcardDirectoryToken"}, {"$type": "WildcardToken"}], "$type": "Glob"}, "IsExclude": false, "TextSpans": [{"Start": 0, "End": 2147483647, "Length": 2147483647, "IsEmpty": false, "$type": "TextSpan"}], "$type": "FilePattern"}], "IgnoredMethods": [{"Options": "IgnoreCase", "RightToLeft": false, "MatchTimeout": "-00:00:00.0010000", "$type": "Regex"}], "ExcludedMutations": [], "ExcludedLinqExpressions": [], "OptimizationMode": "CoverageBasedTest", "ProjectName": "", "ProjectVersion": "", "$type": "StrykerOptions"}
[11:39:46 INF] Identifying project to mutate.
[11:39:46 DBG] Using C:\agent\_work\376\s\src\Data.Tests\Data.Tests.csproj as test project
[11:39:46 DBG] Using C:\agent\_work\376\s\src\Model.Tests\Model.Tests.csproj as test project
[11:39:46 DBG] Using C:\agent\_work\376\s\src\Services.Wcf.Tests\Services.Wcf.Tests.csproj as test project
[11:39:46 DBG] Using C:\agent\_work\376\s\src\Shared.Tests\Shared.Tests.csproj as test project
[11:39:46 DBG] Using C:\agent\_work\376\s\src\Tasks.Tests\Tasks.Tests.csproj as test project
[11:39:46 DBG] Using C:\agent\_work\376\s\src\UI.Web.Tests\UI.Web.Tests.csproj as test project
[11:39:46 DBG] Analyzing solution file sln
[11:39:46 DBG] Analyzing project file C:\agent\_work\376\s\src\Data.Tests\Data.Tests.csproj
[11:40:08 DBG] Analyzing solution file sln
[11:40:08 DBG] Analyzing project file C:\agent\_work\376\s\src\Model.Tests\Model.Tests.csproj
[11:40:14 DBG] Analyzing solution file sln
[11:40:14 DBG] Analyzing project file C:\agent\_work\376\s\src\Services.Wcf.Tests\Services.Wcf.Tests.csproj
[11:40:20 DBG] Analyzing solution file sln
[11:40:20 DBG] Analyzing project file C:\agent\_work\376\s\src\Shared.Tests\Shared.Tests.csproj
[11:40:26 DBG] Analyzing solution file sln
[11:40:26 DBG] Analyzing project file C:\agent\_work\376\s\src\Tasks.Tests\Tasks.Tests.csproj
[11:40:32 DBG] Analyzing solution file sln
[11:40:32 DBG] Analyzing project file C:\agent\_work\376\s\src\UI.Web.Tests\UI.Web.Tests.csproj
[11:40:38 DBG] Using C:\agent\_work\376\s\src\Shared\Shared.csproj as project under test
[11:40:38 INF] The project C:\agent\_work\376\s\src\Shared\Shared.csproj will be mutated.
[11:40:38 DBG] Analyzing solution file sln
[11:40:38 DBG] Analyzing project file C:\agent\_work\376\s\src\Shared\Shared.csproj
[11:40:43 DBG] Skipping auto-generated code file: C:\agent\_work\376\s\src\Shared\Helpers\SharedResources.Designer.cs
[11:40:43 DBG] Skipping auto-generated code file: C:\agent\_work\376\s\src\Shared\obj\Debug\.NETFramework,Version=v4.5.AssemblyAttributes.cs
[11:40:43 INF] Time Elapsed 00:00:57.0120464
Stryker.NET failed to mutate your project. For more information see the logs 
below:


Please upgrade to MsTest V2. Stryker.NET uses VSTest which does not support 
MsTest V1.

See https://devblogs.microsoft.com/devops/upgrade-to-mstest-v2/ for upgrade 
instructions.

Log File

log-20220323.txt

[rouke-broersma]

At least one of your test projects must (also) be an mstest v1 test project. This means that for example a wrong ProjectGuid is used. This automatically loads MsTest v1, which we are not compatible with.

[rouke-broersma]

We check for this here: https://github.com/stryker-mutator/stryker-net/blob/master/src/Stryker.Core/Stryker.Core/Initialisation/InputFileResolver.cs#L152

We check for the existence of a reference to 'Microsoft.VisualStudio.QualityTools.UnitTestFramework'. If we find it we throw the error.

[cmanners]

I found references to MsTest v1 in two of my projects. Once removed, the mutation testing work perfectly. Thank you.