chore: sort resolved selectors deterministically

lib/pact_broker/pacts/selected_pact.rb

@@ -13,7 +13,7 @@ def initialize(pact, selectors)
 
       def self.merge(selected_pacts)
         latest_selected_pact = selected_pacts.sort_by(&:consumer_version_order).last
-        selectors = selected_pacts.collect(&:selectors).reduce(&:+)
+        selectors = selected_pacts.collect(&:selectors).reduce(&:+).sort
         SelectedPact.new(latest_selected_pact.pact, selectors)
       end
 

lib/pact_broker/pacts/selector.rb

@@ -338,6 +338,15 @@ def environment
       def == other
         super && consumer_version == other.consumer_version
       end
+
+      def <=> other
+        comparison = super
+        if comparison == 0
+          consumer_version.order <=> other.consumer_version.order
+        else
+          comparison
+        end
+      end
     end
   end
 end

lib/pact_broker/pacts/selectors.rb

@@ -43,6 +43,10 @@ def + other
         Selectors.new(super)
       end
 
+      def sort
+        Selectors.new(super)
+      end
+
       def overall_latest?
         any?(&:overall_latest?)
       end

spec/lib/pact_broker/pacts/verifiable_pact_messages_spec.rb

@@ -26,7 +26,7 @@ module Pacts
             provider_branch: provider_branch
         )
       end
-      let(:consumer_version) { double("version", number: "1234" )}
+      let(:consumer_version) { double("version", number: "1234", order: 1) }
       let(:environment) { instance_double("PactBroker::Deployments::Environment", name: "test") }
       let(:test_environment) { environment }
       let(:prod_environment) { instance_double("PactBroker::Deployments::Environment", name: "prod") }