(maint) ensure agent run mode for pluginsync test

Author: tvpartytonight

spec/unit/provider/augeas/augeas_spec.rb

@@ -1046,6 +1046,9 @@ def make_tmpname((prefix, suffix), n)
     end
 
     it "alsoes load lenses from pluginsync'd path" do
+      # Puppet must be in agent mode for this test to successfully
+      # complete
+      allow(Puppet).to receive(:run_mode).and_return(Puppet::Util::UnixRunMode.new(:agent))
       Puppet[:libdir] = my_fixture_dir
 
       aug = provider.open_augeas