feat: raise explicit error if a matrix query is done for a version wi…

…th a tag that does not exist

lib/pact_broker/matrix/repository.rb

@@ -144,21 +144,23 @@ def look_up_version_numbers(selectors, options)
         selectors.collect do | selector |
           if selector[:tag] && selector[:latest]
             version = version_repository.find_by_pacticipant_name_and_latest_tag(selector[:pacticipant_name], selector[:tag])
-            raise Error.new("Could not find version with tag #{selector[:tag].inspect} for #{selector[:pacticipant_name]}") unless version
+            raise Error.new("No version of #{selector[:pacticipant_name]} found with tag #{selector[:tag]}") unless version
             # validation in resource should ensure we always have a version
             {
               pacticipant_name: selector[:pacticipant_name],
               pacticipant_version_number: version.number
             }
           elsif selector[:latest]
             version = version_repository.find_latest_by_pacticpant_name(selector[:pacticipant_name])
+            raise Error.new("No version of #{selector[:pacticipant_name]} found") unless version
             {
               pacticipant_name: selector[:pacticipant_name],
               pacticipant_version_number: version.number
             }
           elsif selector[:tag]
             # validation in resource should ensure we always have at least one version
             versions = version_repository.find_by_pacticipant_name_and_tag(selector[:pacticipant_name], selector[:tag])
+            raise Error.new("No version of #{selector[:pacticipant_name]} found with tag #{selector[:tag]}") unless versions.any?
             versions.collect do | version |
               {
                 pacticipant_name: selector[:pacticipant_name],

spec/lib/pact_broker/matrix/repository_spec.rb

@@ -964,6 +964,39 @@ def shorten_rows rows
             expect(subject.count).to eq 0
           end
         end
+
+        context "when there is no version for the specified tag" do
+          before do
+            TestDataBuilder.new
+              .create_pact_with_hierarchy("D", "1", "E")
+          end
+
+          subject { Repository.new.find(selectors) }
+
+          context "when the latest tag is specified" do
+            let(:selectors) { [{ pacticipant_name: 'D', latest: true, tag: 'dev' } ] }
+
+            it "raises an error" do
+              expect { subject }.to raise_error Error, /No version of D found/
+            end
+          end
+
+          context "when all tags are specified" do
+            let(:selectors) { [{ pacticipant_name: 'D', tag: 'dev' } ] }
+
+            it "raises an error" do
+              expect { subject }.to raise_error Error, /No version of D found/
+            end
+          end
+
+          context "when no tags are specified" do
+            let(:selectors) { [{ pacticipant_name: 'E', latest: true } ] }
+
+            it "raises an error" do
+              expect { subject }.to raise_error Error, /No version of E found/
+            end
+          end
+        end
       end
     end
   end