added registrar credit changing functionality

test/system/admin_area/accounts_test.rb

@@ -0,0 +1,20 @@
+require 'application_system_test_case'
+
+class AdminAccountsSystemTest < ApplicationSystemTestCase
+  setup do
+    sign_in users(:admin)
+  end
+
+  def test_download_accounts
+    now = Time.zone.parse('2010-07-05 08:00')
+    travel_to now
+
+    get admin_accounts_path(format: :csv)
+
+    assert_response :ok
+    assert_equal 'text/csv; charset=utf-8', response.headers['Content-Type']
+    assert_equal %(attachment; filename="accounts_#{Time.zone.now.to_formatted_s(:number)}.csv"; filename*=UTF-8''accounts_#{Time.zone.now.to_formatted_s(:number)}.csv),
+                 response.headers['Content-Disposition']
+    assert_not_empty response.body
+  end
+end