The `Get-Process` cmdlet cannot be used for these types of tests due to
security constraints on OS X.
These tests are about to be re-written soon anyway, so the simple fix
was to use another cmdlet.
- The Get-Process cmdlet on OS X has issues due to permissions
- The Get-Process test in NativeLinuxCommands should have been removed
- The ProcessName property has the same bug that has been fixed on Linux