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I'm building a R# plugin and decided to cover it with tests. However, I noticed, that plugin tests cannot be run using the R# runner if plugin target version is the same as R# version.

For instance, if you try to run tests using JetBrains.ReSharper.SDK.Tests of version 2016.2.20160818.171542, you'll get the following error:

ERROR System.TypeLoadException: Method 'RunTests' in type 'JetBrains.ReSharper.UnitTestRunner.nUnit26.BuiltInNUnitRunner' from assembly 'JetBrains.ReSharper.UnitTestRunner.nUnit26, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.

In previous versions the error was different.

Likely, that happens because R# runner and SDK assemblies make a mix.

Is there any way to configure project/R# to be able to run plugin unit tests using the R# runner? Likely, R# dev team uses their own runner.

Thanks!

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Unfortunately, this is a bug in the ReSharper runner in 201.6.2. Something to do with having multiple copies of the same assemblies in the same process - the assemblies from the install, and the assemblies from the bin folder. Something's getting messed up along the way.

You can subscribe to, vote and track this issue: RSRP-460399

The workaround is to install an older version of ReSharper into a Visual Studio "experimental instance" aka "custom hive", and use this instance to develop and test the plugin. The normal instance can be used for other day-to-day development.

You can download an older version of ReSharper here (e.g. 2016.1.2), and in the installer, click Options and enter the name of a custom instance, e.g. "Plugins". Then create a new shortcut to Visual Studio and set the command line to "devenv.exe /rootSuffix Plugins" (or whatever you called the custom hive).

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R# and SDK must be either of different major versions, or of binary compatible versions. Unfortunately, within EAP the internal APIs inside the test runner have changed, so R# and SDK from different EAPs are not compatible.

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