test: fix params merge in yum::config spec

Author: teluq-pbrideau

spec/defines/config_spec.rb

@@ -15,7 +15,9 @@
 
       %w[dnf yum].each do |pkgmgr|
         context "when package_provider fact is #{pkgmgr}" do
-          let(:facts) { { package_provider: pkgmgr } }
+          let(:facts) do
+            super().merge({package_provider: pkgmgr })
+          end
 
           context 'when ensure is a Boolean' do
             let(:title) { 'assumeyes' }