Tests are not displayed in the Test Explorer window when using SpecFlow+ Runner

Note: As of Visual Studio 2017 15.7 the temporary files are no longer used. The following only applies to earlier versions of Visual Studio.

The Visual Studio Test Adapter cache may also get corrupted, causing tests to not be displayed. If this happens, try clearing your cache as follows:

1. Close all Visual Studio instances
2. Navigate to your %TEMP%\VisualStudioTestExplorerExtensions\ folder and delete any sub-folders related to SpecFlow/SpecRun, i.e. that have "SpecFlow" or "SpecRun" in their name.
3. Reopen your solution and ensure that it builds.