added rspec for magic word <<reset>>

spec/lib/vmdb/settings_spec.rb

@@ -265,6 +265,57 @@
       miq_server.zone.reload
       expect(miq_server.zone.settings_changes.count).to eq 0
     end
+
+    context "deleting entries" do
+      let(:server_value) { 1 }
+      let(:zone_value) { 2 }
+      let(:region_value) {3}
+
+      let(:reset) { ::Vmdb::Settings::DELETE_COMMAND }
+      let(:reset_all) { ::Vmdb::Settings::DELETE_ALL_COMMAND }
+
+      let(:second_server) { FactoryGirl.create(:miq_server, :zone => miq_server.zone) }
+      #let(:zone2) { FactoryGirl.create(:zone) }
+      #let(:miq_server2) { FactoryGirl.create(:miq_server, :zone => zone2) }
+
+
+      before do
+        MiqRegion.seed
+        @settings_from_yaml = Vmdb::Settings.for_resource(miq_server)
+        expect(@settings_from_yaml.api.token_ttl).to eq "10.minutes"
+        expect(@settings_from_yaml.session.timeout).to eq 3600
+
+        described_class.save!(miq_server, :api => {:token_ttl => server_value}, :session => {:timeout => server_value})
+        described_class.save!(miq_server, :api => {:new_key => "new value"})
+        described_class.save!(second_server, :api => {:token_ttl => server_value}, :session => {:timeout => server_value})
+
+        described_class.save!(miq_server.zone, :api => {:token_ttl => zone_value}, :session => {:timeout => zone_value})
+        described_class.save!(miq_server.miq_region, :api => {:token_ttl => region_value}, :session => {:timeout => region_value})
+        expect(SettingsChange.count).to eq 9
+      end
+
+      context "magic value <<reset>>" do
+        it "deletes key-value if specified on leaf level (while keeping other leafs unchanged)" do
+          described_class.save!(miq_server, :api => {:token_ttl => reset})
+
+          expect(SettingsChange.count).to eq 8
+          expect(miq_server.settings_changes.find_by(:key => "/api/token_ttl")).to be nil
+          server_settings = Vmdb::Settings.for_resource(miq_server)
+          expect(server_settings.api.token_ttl).to eq zone_value
+          expect(server_settings.api.new_key).to eq "new value"
+          expect(Vmdb::Settings.for_resource(second_server).api.token_ttl).to eq server_value
+        end
+
+        it "deletes current node and all sub-nodes if specified on node level ((while keeping other nodes unchanged)" do
+          described_class.save!(miq_server, :api => reset)
+
+          expect(SettingsChange.count).to eq 7
+          expect(miq_server.settings_changes.where("key LIKE ?", "/api%").count).to eq 0
+          expect(Vmdb::Settings.for_resource(miq_server).api.new_key).to eq nil
+          expect(Vmdb::Settings.for_resource(second_server).api.token_ttl).to eq server_value
+        end
+      end
+    end
   end
 
   shared_examples_for "password handling" do