I'm following the example on https://docs.microsoft.com/en-gb/visualstudio/test/walkthrough-creating-and-running-unit-tests-for-managed-code
to learn about unit testing.
When I add the reference to Bank.sln I'm getting a message:
A reference to D:\Documents\UnitTesting\B
ln could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.
Could it be because Visual Studio 2017 is installed on my C drive and this project is on my D drive? I'm using C#.net