Fix admin accounts CSV output

app/models/account.rb

@@ -12,4 +12,12 @@ class Account < ApplicationRecord
   def activities
     account_activities
   end
+
+  def as_csv_row
+    [id, balance, currency, registrar]
+  end
+
+  def self.csv_header
+    ['Id', 'Balance', 'Currency', 'Registrar'].freeze
+  end
 end

test/fixtures/files/accounts.csv

@@ -0,0 +1,4 @@
+Id,Balance,Currency,Registrar
+112846265,100.0,EUR,Best Names
+298486374,100.0,EUR,Good Names
+597560588,0.0,EUR,Not in use

test/system/admin_area/accounts_test.rb

@@ -29,4 +29,16 @@ class AdminAccountsSystemTest < ApplicationSystemTestCase
     assert_text 'Account has been successfully updated'
     assert_text '234'
   end
+
+  def test_download_accounts_list_as_csv
+    travel_to Time.zone.parse('2010-07-05 10:30')
+
+    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_equal file_fixture('accounts.csv').read, response.body
+  end
 end