feat(pacts for verification): update inclusion reason to support fall…

…back tag explanation

lib/pact_broker/pacts/selector.rb

@@ -33,10 +33,15 @@ def self.latest_for_tag(tag)
         Selector.new(latest: true, tag: tag)
       end
 
+      def self.latest_for_tag_with_fallback(tag, fallback_tag)
+        Selector.new(latest: true, tag: tag, fallback_tag: fallback_tag)
+      end
+
       def self.all_for_tag(tag)
         Selector.new(tag: tag)
       end
 
+
       def self.from_hash hash
         Selector.new(hash)
       end

lib/pact_broker/pacts/verifiable_pact_messages.rb

@@ -129,7 +129,11 @@ def selector_description selector
         if selector.overall_latest?
           "latest pact between a consumer and #{provider_name}"
         elsif selector.latest_for_tag?
-          "latest pact for a consumer version tagged '#{selector.tag}'"
+          if selector.fallback_tag?
+            "latest pact for a consumer version tagged '#{selector.fallback_tag}' (fallback tag used as no pact was found with tag '#{selector.tag}')"
+          else
+            "latest pact for a consumer version tagged '#{selector.tag}'"
+          end
         elsif selector.tag
           "pacts for all consumer versions tagged '#{selector.tag}'"
         else

spec/lib/pact_broker/pacts/verifiable_pact_messages_spec.rb

@@ -48,6 +48,10 @@ module Pacts
           its(:inclusion_reason) { is_expected.to include " (all have the same content)" }
         end
 
+        context "when the pact was selected by the fallback tag" do
+          let(:selectors) { Selectors.new(Selector.latest_for_tag_with_fallback("feat-x", "master")) }
+          its(:inclusion_reason) { is_expected.to include "latest pact for a consumer version tagged 'master' (fallback tag used as no pact was found with tag 'feat-x')" }
+        end
 
         context "when the pact is a WIP pact" do
           let(:selectors) { Selectors.create_for_latest_of_each_tag(%w[feat-x]) }