add feature tests for CI limit warnings

spec/features/ci_shared_runner_limits_spec.rb

+require 'spec_helper'
+
+feature 'CI shared runner limits', feature: true do
+  let(:user) { create(:user) }
+
+  before do
+    login_as(user)
+  end
+
+  context 'with project' do
+    let(:project) { create(:project, namespace: namespace, shared_runners_enabled: true) }
+    let(:namespace) { create(:namespace) }
+
+    before do
+      project.team << [user, :developer]
+    end
+
+    context 'without limit' do
+      scenario 'it does not display a warning message on project homepage' do
+        visit namespace_project_path(project.namespace, project)
+        expect_no_quota_exceeded_alert
+      end
+    end
+
+    context 'when limit is defined' do
+      context 'when limit is exceeded' do
+        let(:namespace) { create(:namespace, :with_used_build_minutes_limit) }
+
+        scenario 'it displays a warning message on project homepage' do
+          visit namespace_project_path(project.namespace, project)
+          expect_quota_exceeded_alert('You have exceeded your build minutes quota.')
+        end
+      end
+
+      context 'when limit not yet exceeded' do
+        let(:namespace) { create(:namespace, :with_not_used_build_minutes_limit) }
+
+        scenario 'it does not display a warning message on project homepage' do
+          visit namespace_project_path(project.namespace, project)
+          expect_no_quota_exceeded_alert
+        end
+      end
+
+      context 'when minutes are not yet set' do
+        let(:namespace) { create(:namespace, :with_build_minutes_limit) }
+
+        scenario 'it does not display a warning message on project homepage' do
+          visit namespace_project_path(project.namespace, project)
+          expect_no_quota_exceeded_alert
+        end
+      end
+    end
+  end
+
+  def expect_quota_exceeded_alert(message = nil)
+    expect(page).to have_selector('.shared-runner-quota-message', count: 1)
+    expect(page.find('.shared-runner-quota-message')).to have_content(message) unless message.nil?
+  end
+
+  def expect_no_quota_exceeded_alert
+    expect(page).not_to have_selector('.shared-runner-quota-message')
+  end
+end