Build failed - consistently failing unit test on mac

[amunger]

Build: https://dev.azure.com/monacotools/a6d41577-0fa3-498e-af22-257312ff0545/_build/results?buildId=317284
Changes: 80a241d...d74a267

1. SimpleCompletionModel
   files and folders
   should handle many files and folders correctly:

[meganrogge]

Does not reproduce locally for me

[Tyriar]

Must have been fixed