在VS 2019中运行时，所有单元测试都不确定

Question

我正在使用Unit Test Explorer和Unit Test Sessions进行测试并突然出现以下错误。

[在Test -> Test explorer中运行时，测试根本不会运行，并且我看不到任何错误。

在两种情况下，Output窗口中都没有内容。我已经重新安装R＃，清除了VS缓存（在%USERPROFILE%\AppData\Local\Microsoft中），重新启动了Windows，重新启动了VS。

2019.10.25 14:54:08.058   ERROR Remote: An exception occurred while invoking executor 'executor://mstestadapter/v2': Method not found: 'Void Microsoft.VisualStudio.TestTools.UnitTesting.TestContext.set_CancellationTokenSource(System.Threading.CancellationTokenSource)'.

--- EXCEPTION #1/1 [LoggerException]
Message = “Remote: An exception occurred while invoking executor 'executor://mstestadapter/v2': Method not found: 'Void Microsoft.VisualStudio.TestTools.UnitTesting.TestContext.set_CancellationTokenSource(System.Threading.CancellationTokenSource)'.”
ExceptionPath = Root
ClassName = JetBrains.Util.LoggerException
HResult = COR_E_APPLICATION=80131600
StackTraceString = “
  at JetBrains.ReSharper.UnitTesting.MSTest.Provider.New.TestHost.TestHostMsTestRunner.TestExecutionEventHandler.HandleLogMessage(TestMessageLevel level, String message)
     at Microsoft.TestPlatform.VsTestConsole.TranslationLayer.VsTestConsoleRequestSender.SendMessageAndListenAndReportTestResults(String messageType, Object payload, ITestRunEventsHandler eventHandler, ITestHostLauncher customHostLauncher)
    (...)

Answer 1