Add IidRoutes for Epic

ee/app/models/ee/epic.rb

@@ -4,6 +4,7 @@ module EE
 
     prepended do
       include AtomicInternalId
+      include IidRoutes
       include ::Issuable
       include Noteable
       include Referable

ee/spec/models/epic_spec.rb

@@ -23,6 +23,7 @@ describe Epic do
     it_behaves_like 'AtomicInternalId' do
       let(:internal_id_attribute) { :iid }
       let(:instance) { build(:epic) }
+      let(:scope) { :group }
       let(:scope_attrs) { { namespace: instance.group } }
       let(:usage) { :epics }
     end

spec/lib/gitlab/ci/pipeline/chain/populate_spec.rb

@@ -174,7 +174,7 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
       end
 
       let(:pipeline) do
-        build(:ci_pipeline, ref: 'master', project: project, sconfig: config)
+        build(:ci_pipeline, ref: 'master', project: project, config: config)
       end
 
       it_behaves_like 'populates pipeline according to used policies'