Test discovery not finding PowerShell tests when opening folder

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PoshTools 4.0.31, VS 15.8.7, PS 5.1.17134.407 Desktop

I'm assuming this is a bug rather than an intentional choice or VS limitation- sorry if I'm wrong!

When you open a folder in Visual Studio, Pester tests are not found by test discovery. The same files are found correctly when in a PowerShell project.

[08/12/2018 14:59:09 Diagnostic] No containers found from 'PowerShellTools.TestAdapter.PowerShellTestContainerDiscoverer' :

Having looked at the discovery code, I suspect the issue is in FindPowerShellTestFiles, as it first checks project.IsPowerShellProject, which I assume doesn't return true for a folder, and stops checking if it's not a PowerShell project. I think just removing that check would likely fix the issue? Checking for Pester tests in a non-PowerShell project doesn't seem like the worst thing in the world as I suppose it's possible to use it to test things that aren't PowerShell.

Test files are also not given the test file icon in solution explorer when a folder is opened, I assume for the same reason.