you need to be conscious of the changes you make. In the case of renaming a test - it will confuse Visual Studio. VS will think the renamed file has disappeared and it will throw an error to that end. You need to:
A) Remove the old file reference
B) Add the new file
Check out the following video:
There are other situations to look out for. Running a test that has coded steps in both Standalone and VS will cause the entire test project to be built. So you should be careful that all the entire test project is compilation errors-free at all times.
the Telerik team