System test for CSV export

#5

spec/system/export_spec.rb

@@ -0,0 +1,38 @@
+require 'rails_helper'
+
+RSpec.describe "Exports", type: :system do
+  let!(:user) { create(:user) }
+
+  before do
+    driven_by :selenium_chrome_with_download_headless
+  end
+
+  after do
+    clear_downloads
+  end
+
+  context "when in a contest with at least one contestant" do
+    let!(:contest) { create(:contest, user: user) }
+    let!(:first_contestant) { create(:contestant, contest: contest) }
+    let!(:second_contestant) { create(:contestant, contest: contest) }
+
+    it "should be possible to export the list of contestants", :with_downloads do
+      login(user)
+
+      sleep 0.5
+
+      visit contest_contestants_path(contest)
+
+      click_link I18n.t("helpers.buttons.export")
+
+      wait_for_download
+
+      expect(downloads.length).to eq(1)
+      expect(last_download).to include("#{contest.friendly_id}_results.csv")
+
+      results_csv = File.read(last_download)
+      expect(results_csv).to include(first_contestant.name)
+      expect(results_csv).to include(second_contestant.name)
+    end
+  end
+end