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In this page of JetBrains Rider options, you can adjust unit testing settings related to MSTest tests.
|Enable MSTest support||By default, JetBrains Rider adds action indicators allowing you to execute MSTest tests right from the editor and automatically discovers MSTest tests in your solution. Clear this checkbox to disable this behavior.|
|Choose the IDE folder|| As MSTest v1 is not distributed without Visual Studio, you have to specify the IDE folder inside a Visual Studio installation on your machine. JetBrains Rider will find all necessary executables in this folder. |
MSTest v2, on the other hand is delivered as a NuGet package. If you are using MSTest v2 in a .NET Core project, then you do not need to specify the IDE folder.
However, MSTest v2 in a classic .NET Framework project still requires Visual Studio, so you need to specify the Visual Studio's IDE folder in this case.
Specify a custom test settings configuration (.testsettings file within your solution).