Add a unit test for serializing pipelines with bridges

ee/spec/serializers/pipeline_serializer_spec.rb

+require 'spec_helper'
+
+describe PipelineSerializer do
+  set(:project) { create(:project, :repository) }
+  set(:user) { create(:user) }
+
+  let(:serializer) do
+    described_class.new(current_user: user)
+  end
+
+  subject { serializer.represent(pipeline, details: true) }
+
+  context 'when pipeline contains bridge jobs' do
+    let(:pipeline) do
+      create(:ci_empty_pipeline,
+             project: project,
+             status: :success,
+             ref: :master)
+    end
+
+    before do
+      create(:ci_bridge, pipeline: pipeline)
+    end
+
+    it 'serializes bridge job correctly' do
+      name = subject.dig(:details, :stages, 0, :latest_statuses, 0, :name)
+
+      expect(name).to eq 'bridge'
+    end
+  end
+end

spec/factories/ci/bridge.rb

 FactoryBot.define do
   factory :ci_bridge, class: Ci::Bridge do
-    name ' bridge'
+    name 'bridge'
     stage 'test'
     stage_idx 0
     ref 'master'