Introduce a new EE::Repository#insights_config_for method

Signed-off-by: Rémy Coutable <remy@rymai.me>

ee/app/models/ee/repository.rb

@@ -103,5 +103,9 @@ module EE
       possible_code_owner_blobs = ::Gitlab::CodeOwners::FILE_PATHS.map { |path| [ref, path] }
       blobs_at(possible_code_owner_blobs).compact.first
     end
+
+    def insights_config_for(sha)
+      blob_data_at(sha, ::Gitlab::Insights::CONFIG_FILE_PATH)
+    end
   end
 end

ee/lib/gitlab/insights.rb

@@ -2,6 +2,7 @@
 
 module Gitlab
   module Insights
+    CONFIG_FILE_PATH = '.gitlab/insights.yml'
     COLOR_SCHEME = {
       red: '#e6194b',
       green: '#3cb44b',

ee/spec/models/repository_spec.rb

@@ -187,4 +187,25 @@ describe Repository do
         .not_to change { ::Geo::RepositoryUpdatedEvent.count }
     end
   end
+
+  describe "#insights_config_for" do
+    context 'when no config file exists' do
+      it 'returns nil if does not exist' do
+        expect(repository.insights_config_for(repository.root_ref)).to be_nil
+      end
+    end
+
+    it 'returns nil for an empty repository' do
+      allow(repository).to receive(:empty?).and_return(true)
+
+      expect(repository.insights_config_for(repository.root_ref)).to be_nil
+    end
+
+    it 'returns a valid Insights config file' do
+      project = create(:project, :custom_repo, files: { Gitlab::Insights::CONFIG_FILE_PATH => '- key: monthlyBugsCreated' })
+      insights_config_blob = project.repository.blob_at(project.repository.root_ref, Gitlab::Insights::CONFIG_FILE_PATH)
+
+      expect(project.repository.insights_config_for(project.repository.root_ref)).to eq('- key: monthlyBugsCreated')
+    end
+  end
 end