(maint) Switch to rspec-mocks

Author: GabrielNagy

spec/spec_helper.rb

@@ -31,6 +31,7 @@
 end
 
 RSpec.configure do |c|
+  c.mock_with :rspec
   c.default_facts = default_facts
   c.before :each do
     # set to strictest setting for testing