Added download emails spec and renamed newsletters spec

spec/features/admin/emails/emails_download_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+feature "Admin download user emails" do
+
+  background do
+    admin = create(:administrator)
+    login_as(admin.user)
+  end
+
+  context "Index" do
+    scenario "returns the selected users segment csv file" do
+      user1 = create(:user)
+      user2 = create(:user)
+
+      visit admin_emails_download_index_path
+
+      within('#admin_download_emails') do
+        select 'All users', from: 'users_segment'
+        click_button 'Download emails list'
+      end
+
+      header = page.response_headers['Content-Disposition']
+      expect(header).to match /^attachment/
+      expect(header).to match /filename="All users.csv"$/
+
+      expect(page).to have_content(user1.email)
+      expect(page).to have_content(user2.email)
+    end
+  end
+end