Add test to check if transaction date included in request

test/models/directo_test.rb

@@ -0,0 +1,20 @@
+require 'test_helper'
+
+class DirectoTest < ActiveSupport::TestCase
+  setup do
+    @invoice = invoices(:one)
+  end
+
+  def test_xml_is_include_transaction_date
+    @invoice.update(total: @invoice.account_activity.bank_transaction.sum)
+    @invoice.account_activity.bank_transaction.update(paid_at: Time.zone.now)
+
+    stub_request(:post, ENV['directo_invoice_url']).with do |request|
+      request.body.include? 'TransactionDate'
+    end
+
+    assert_nothing_raised do
+      Directo.send_receipts
+    end
+  end
+end