Fix the test and implement missing update

app/models/ci/pipeline.rb

@@ -327,6 +327,8 @@ module Ci
       @ci_yaml_file = begin
         project.repository.gitlab_ci_yml_for(sha, ci_yaml_file_path)
       rescue
+        self.yaml_errors =
+          "Failed to load CI/CD config file at #{ci_yaml_file_path}"
         nil
       end
     end

spec/models/ci/pipeline_spec.rb

@@ -744,31 +744,45 @@ describe Ci::Pipeline, models: true do
 
   describe 'yaml config file resolution' do
     let(:project) { FactoryGirl.build(:project) }
-
     let(:pipeline) { create(:ci_empty_pipeline, project: project) }
+
     it 'uses custom ci config file path when present' do
       allow(project).to receive(:ci_config_file) { 'custom/path' }
+
       expect(pipeline.ci_yaml_file_path).to eq('custom/path/.gitlab-ci.yml')
     end
+
     it 'uses root when custom path is nil' do
       allow(project).to receive(:ci_config_file) { nil }
+
       expect(pipeline.ci_yaml_file_path).to eq('.gitlab-ci.yml')
     end
+
     it 'uses root when custom path is empty' do
       allow(project).to receive(:ci_config_file) { '' }
+
       expect(pipeline.ci_yaml_file_path).to eq('.gitlab-ci.yml')
     end
+
     it 'allows custom filename' do
       allow(project).to receive(:ci_config_file) { 'custom/path/.my-config.yml' }
+
       expect(pipeline.ci_yaml_file_path).to eq('custom/path/.my-config.yml')
     end
+
     it 'custom filename must be yml' do
       allow(project).to receive(:ci_config_file) { 'custom/path/.my-config.cnf' }
+
       expect(pipeline.ci_yaml_file_path).to eq('custom/path/.my-config.cnf/.gitlab-ci.yml')
     end
+
     it 'reports error if the file is not found' do
+      allow(project).to receive(:ci_config_file) { 'custom' }
+
       pipeline.ci_yaml_file
-      expect(pipeline.yaml_errors).to eq('Failed to load CI config file')
+
+      expect(pipeline.yaml_errors)
+        .to eq('Failed to load CI/CD config file at custom/.gitlab-ci.yml')
     end
   end