text: import datetime
  
  from django.test import TestCase
  from django.utils import timezone
  
  from catalog.forms import RenewBookForm
  
  # Create your tests here.
  class RenewBookFormTest(TestCase):
      def test_renew_form_date_field_label(self):
          form = RenewBookForm()
          self.assertTrue(form.fields['renewal_date'].label == None or form.fields['renewal_date'].label == 'renewal date')
  
      def test_renew_form_date_in_past(self):
          date = datetime.date.today() - datetime.timedelta(days=1)
          form = RenewBookForm(data={'renewal_date': date})
          self.assertFalse(form.is_valid())
  
      def test_renew_form_date_too_far_in_future(self):
          date = datetime.date.today() + datetime.timedelta(weeks=4) + datetime.timedelta(days=1)
          form = RenewBookForm(data={'renewal_date': date})
          self.assertFalse(form.is_valid())
  
      def test_renew_form_date_today(self):
          date = datetime.date.today()
          form = RenewBookForm(data={'renewal_date': date})
          self.assertTrue(form.is_valid())
  
      def test_renew_form_date_max(self):
          date = timezone.localtime() + datetime.timedelta(weeks=4)
          form = RenewBookForm(data={'renewal_date': date})
          self.assertTrue(form.is_valid())
  