Stryker fails to find all rollbackable mutations

Describe the bug We have one test project XXX.Tests it is .Net Core 2.1, it have references to two .Net Standard 2.0 projects - XXX.Api & XXX.Core

With XXX.Core project all working as expected, thanks.

But for XXX.Api it fails with exception

Logs

[09:07:06 INF] Started initial build using dotnet build
[09:07:09 INF] Initial build successful
[09:07:09 INF] Using testrunner DotnetTest
[09:07:09 INF] Initial testrun started
[09:07:13 INF] Total number of tests found in initial test run: 0
[09:07:13 INF] Initial testrun successful in 3532 ms
[09:07:13 INF] Using 105298 ms as testrun timeout
[09:07:16 WRN] Stryker.NET encountered an compile error in C:\Work\XX\XXX.Api\Clients\XXXX.cs with message: Argument 2: cannot convert from 'System.Exception' to 'System.Runtime.Serialization.StreamingContext' (Source code: innerException)
[09:07:16 WRN] Safe Mode! Stryker will try to continue by rolling back all mutations in method. This should not happen, please report this as an issue on github with the previous error message.
[09:07:16 FTL] Stryker.NET could not compile the project after mutation. This is probably an error for Stryker.NET and not your project. Please report this issue on github with the previous error message.
[09:07:16 ERR] An error occurred during the mutation test run
System.ApplicationException: Internal error due to compile error.
   at Stryker.Core.Compiling.RollbackProcess.RemoveMutantIfStatements(SyntaxTree originalTree, ICollection`1 diagnosticInfo, Boolean devMode) in D:\a\1\s\src\Stryker.Core\Stryker.Core\Compiling\RollbackProcess.cs:line 191
   at Stryker.Core.Compiling.RollbackProcess.Start(CSharpCompilation compiler, ImmutableArray`1 diagnostics, Boolean devMode) in D:\a\1\s\src\Stryker.Core\Stryker.Core\Compiling\RollbackProcess.cs:line 61
   at Stryker.Core.Compiling.CompilingProcess.TryCompilation(MemoryStream ms, CSharpCompilation compilation, EmitResult previousEmitResult, Boolean devMode, Int32 retryCount) in D:\a\1\s\src\Stryker.Core\Stryker.Core\Compiling\CompilingProcess.cs:line 108
   at Stryker.Core.Compiling.CompilingProcess.Compile(IEnumerable`1 syntaxTrees, MemoryStream ms, Boolean devMode) in D:\a\1\s\src\Stryker.Core\Stryker.Core\Compiling\CompilingProcess.cs:line 76
   at Stryker.Core.MutationTest.MutationTestProcess.Mutate(StrykerOptions options) in D:\a\1\s\src\Stryker.Core\Stryker.Core\MutationTest\MutationTestProcess.cs:line 91
   at Stryker.Core.StrykerRunner.RunMutationTest(StrykerOptions options) in D:\a\1\s\src\Stryker.Core\Stryker.Core\StrykerRunner.cs:line 77
[09:07:16 INF] Time Elapsed 00:00:14.8422309

Expected behavior For XXX.Api same behavior as for XXX.Core:

[09:02:52 INF] Started initial build using dotnet build
[09:02:58 INF] Initial build successful
[09:02:58 INF] Using testrunner DotnetTest
[09:02:58 INF] Initial testrun started
[09:03:01 INF] Total number of tests found in initial test run: 0
[09:03:01 INF] Initial testrun successful in 3541 ms
[09:03:01 INF] Using 105311 ms as testrun timeout
[09:03:05 INF] 1 mutants could not compile and got status CompileError
[09:03:05 INF] 64 mutants ready for test

Your html report has been generated at:
 C:\Work\XX\XXX.UnitTests\StrykerOutput\2019-05-27.09-02-47\reports\mutation-report.html
You can open it in your browser of choice.
[09:04:49 INF] Time Elapsed 00:02:02.3004631

Desktop (please complete the following information):

• OS: Windows 10 x64
• Type of project xamarin
• Framework Version .Net Core 2.1 & .Net Standard 2.0
• Stryker Version 0.11.0

[rouke-broersma]

We are investigating the root cause, this should not have happened as we have a fallback mechanism in case a mutation causes a compile failure. In your case it seems to have fallen through anyway. You can keep this issue open and we will implement a fix.

If you find out what’s wrong with NUnit I would appreciate a new issue with details so we can investigate that as well.

[bbenetskyy]

Just check with that project with newer version it works for me 😊