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Stryker 0.5.0 crashes on simple project

See original GitHub issue

Stryker crashes on a simple project. It seems to fail inside the TotalNumberOfTestsParser.

[22:07:26 INF] Using C:\Dev\ExampleProjects\ExampleProject\ExampleProject.XUnit\ExampleProject.XUnit.csproj as project file
[22:07:26 INF] Starting initial build
[22:07:28 INF] Initial build successful
[22:07:29 INF] Using testrunner DotnetTestRunner
[22:07:29 INF] Initial testrun started
[22:07:31 ERR] An error occurred during the mutation test run
System.IO.FileNotFoundException: Could not load file or assembly 'System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
   at Stryker.Core.Parsers.TotalNumberOfTestsParser.ParseTotalNumberOfTests(String testProcessRunnerOutput)
   at Stryker.Core.TestRunners.DotnetTestRunner.RunAll(Nullable`1 timeoutMS, Nullable`1 activeMutationId)
   at Stryker.Core.Initialisation.InitialTestProcess.InitialTest(ITestRunner testRunner)
   at Stryker.Core.Initialisation.InitialisationProcess.Initialize(StrykerOptions options)
   at Stryker.Core.StrykerRunner.RunMutationTest(StrykerOptions options)

[22:07:31 INF] Time Elapsed 00:00:05.2187106