I just noticed that a set of tests in my current project were showing as inconclusive in the Resharper test runner in Visual Studio 2012. Clicking on an individual test showed only the message “Test wasn’t run” with no obvious output in the test runner or the output tab.
Turns out the problem was in the test project’s app.config file.
I had a binding redirect that was pointing to a version of an assembly that I wasn’t deploying with the test project.
In short, any problem loading your test assembly may generate the same behavior in either the Visual Studio or Resharper test runners.
If you run into a “Tests weren’t run” error in Visual Studio, review your app.config file for syntax errors and binding redirects that might be broken.