Add test for exporting issues as csv

qa/qa/specs/features/ee/browser_ui/2_plan/issues_list/export_as_csv_spec.rb

+# frozen_string_literal: true
+
+require 'securerandom'
+
+module QA
+  context 'Plan' do
+    describe 'Issues list' do
+      let(:project) do
+        Resource::Project.fabricate_via_api! do |project|
+          project.name = 'project-to-test-export-issues-as-csv'
+        end
+      end
+
+      before do
+        Flow::Login.sign_in
+
+        2.times do
+          Resource::Issue.fabricate_via_api! do |issue|
+            issue.project = project
+            issue.title = "Issue-#{SecureRandom.hex(4)}"
+          end
+        end
+
+        project.visit!
+        Page::Project::Menu.perform(&:click_issues)
+      end
+
+      it 'successfully exports issues list as CSV' do
+        Page::Project::Issue::Index.perform do |index|
+          index.click_export_as_csv_button
+
+          expect(index.export_issues_modal).to have_content('2 issues selected')
+
+          index.click_export_issues_button
+
+          expect(index).to have_content(/Your CSV export has started. It will be emailed to (\S+) when complete./)
+        end
+      end
+    end
+  end
+end