feat(matrix): improve reason when no results are found

lib/pact_broker/api/decorators/matrix_decorator.rb

@@ -26,11 +26,13 @@ def to_hash(options)
         end
 
         def deployable
+          return nil if lines.empty?
           return nil if lines.any?{ |line| line[:success].nil? }
           lines.any? && lines.all?{ |line| line[:success] }
         end
 
         def reason
+          return "No results matched the given query" if lines.empty?
           case deployable
           when true then "All verification results are published and successful"
           when false then "One or more verifications have failed"

spec/lib/pact_broker/api/decorators/matrix_decorator_spec.rb

@@ -160,6 +160,18 @@ module Decorators
               expect(parsed_json[:summary][:reason]).to match /have failed/
             end
           end
+
+          context "when there are no results" do
+            let(:lines) { [] }
+
+            it "has a deployable flag of false" do
+              expect(parsed_json[:summary][:deployable]).to be nil
+            end
+
+            it "has an explanation" do
+              expect(parsed_json[:summary][:reason]).to match /No results/
+            end
+          end
         end
       end
     end