Add feature specs for test coverage badge

spec/features/projects/badges/coverage_spec.rb

+require 'spec_helper'
+
+feature 'test coverage badge' do
+  given!(:user) { create(:user) }
+  given!(:project) { create(:project, :private) }
+
+  given!(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         ref: 'master',
+                         sha: project.commit.id)
+  end
+
+  context 'when user has access to view badge' do
+    background do
+      project.team << [user, :developer]
+      login_as(user)
+    end
+
+    scenario 'user requests coverage badge image for pipeline' do
+      create_job(coverage: 100, name: 'test:1')
+      create_job(coverage: 90, name: 'test:2')
+
+      show_test_coverage_badge
+
+      expect_coverage_badge('95%')
+    end
+
+    scenario 'user requests coverage badge for specific job' do
+      create_job(coverage: 50, name: 'test:1')
+      create_job(coverage: 50, name: 'test:2')
+      create_job(coverage: 85, name: 'coverage')
+
+      show_test_coverage_badge(job: 'coverage')
+
+      expect_coverage_badge('85%')
+    end
+
+    scenario 'user requests coverage badge for pipeline without coverage' do
+      create_job(coverage: nil, name: 'test')
+
+      show_test_coverage_badge
+
+      expect_coverage_badge('unknown')
+    end
+  end
+
+  context 'when user does not have access to view badge' do
+    background { login_as(user) }
+
+    scenario 'user requests test coverage badge image' do
+      show_test_coverage_badge
+
+      expect(page).to have_http_status(404)
+    end
+  end
+
+  def create_job(coverage:, name:)
+    create(:ci_build, name: name,
+                      coverage: coverage,
+                      pipeline: pipeline)
+  end
+
+  def show_test_coverage_badge(job: nil)
+    visit coverage_namespace_project_badges_path(
+      project.namespace, project, ref: :master, job: job, format: :svg)
+  end
+
+  def expect_coverage_badge(coverage)
+    svg = Nokogiri::XML.parse(page.body)
+    expect(page.response_headers['Content-Type']).to include('image/svg+xml')
+    expect(svg.at(%Q{text:contains("#{coverage}")})).to be_truthy
+  end
+end