Add tests for Ci::Pipeline entity

spec/lib/api/entities/ci/pipeline_spec.rb

@@ -3,14 +3,31 @@
 require 'spec_helper'
 
 RSpec.describe API::Entities::Ci::Pipeline do
-  let_it_be(:pipeline) { create(:ci_empty_pipeline) }
+  let_it_be(:user) { create(:user) }
+  let_it_be(:pipeline) { create(:ci_empty_pipeline, user: user) }
   let_it_be(:job) { create(:ci_build, name: "rspec", coverage: 30.212, pipeline: pipeline) }
 
   let(:entity) { described_class.new(pipeline) }
 
   subject { entity.as_json }
 
-  it 'returns the coverage as a string' do
+  exposed_fields = %i[before_sha tag yaml_errors created_at updated_at started_at finished_at committed_at duration queued_duration]
+
+  exposed_fields.each do |field|
+    it "exposes pipeline #{field}" do
+      expect(subject[field]).to eq(pipeline.public_send(field))
+    end
+  end
+
+  it 'exposes pipeline user basic information' do
+    expect(subject[:user].keys).to include(:avatar_url, :web_url)
+  end
+
+  it 'exposes pipeline detailed status' do
+    expect(subject[:detailed_status].keys).to include(:icon, :favicon)
+  end
+
+  it 'exposes pipeline coverage as a string' do
     expect(subject[:coverage]).to eq '30.21'
   end
 end