text: from django.template import Context, Template
  from django.test import TestCase
  from django.utils.html import escape
  
  from .compat import parse_qs, quote_plus, urlparse
  from .helpers import *
  
  
  class TestGravatarHelperMethods(TestCase):
  
      def test_gravatar_hash_generation(self):
          """
          Verify the generation of hash from email string.
          """
          email = "MyEmailAddress@example.com"
          email_hash = "0bc83cb571cd1c50ba6f3e8a78ef1346"
  
          self.assertEqual(calculate_gravatar_hash(email), email_hash)
          self.assertEqual(calculate_gravatar_hash(email), calculate_gravatar_hash(email.lower()))
  
      def test_gravatar_url(self):
          """
          Verify that the gravatar_url method returns the expected output.
          """
          email = "joe@example.com"
          email_upper = "JOE@example.com"
          email_strip = "   JOE@example.com "
  
          # Construct the url
          url = get_gravatar_url(email)
  
          # Verify email is properly sanitized
          self.assertEqual(url, get_gravatar_url(email_upper))
          self.assertEqual(url, get_gravatar_url(email_strip))
  
          # Parse query string from url
          urlp = urlparse(url)
          qs = parse_qs(urlp.query)
  
          # Verify the correct query arguments are included with the proper defaults
          self.assertTrue('s' in qs)
          self.assertTrue('d' in qs)
          self.assertTrue('r' in qs)
  
          self.assertEqual(qs.get('s').pop(), str(GRAVATAR_DEFAULT_SIZE))
          self.assertEqual(qs.get('d').pop(), GRAVATAR_DEFAULT_IMAGE)
          self.assertEqual(qs.get('r').pop(), GRAVATAR_DEFAULT_RATING)
  
          # Verify the correct protocol is used
          if GRAVATAR_DEFAULT_SECURE:
              self.assertTrue(GRAVATAR_SECURE_URL in url)
          else:
              self.assertTrue(GRAVATAR_URL in url)
  
          # Verify that a url value for default is urlencoded
          default_url = 'https://www.example.com/default.jpg'
          url = get_gravatar_url(email, default=default_url)
  
          # Verify urlencoding
          self.assertTrue(quote_plus(default_url) in url)
  
      def test_has_gravatar(self):
          """
          Verify that the has_gravatar helper method correctly
          determines if a user has a gravatar or not.
          """
          bad_email = 'eve@example.com'
          good_email = 'matt@automattic.com'
  
          self.assertFalse(has_gravatar(bad_email))
          self.assertTrue(has_gravatar(good_email))
  
      def test_gravatar_profile_url(self):
          """
          Verify that the get_gravatar_profile_url helper method correctly
          generates a profile url for gravatar user.
          """
          email = 'joe@example.com'
          profile_url = get_gravatar_profile_url(email)
          email_hash = calculate_gravatar_hash(email)
  
          self.assertTrue(profile_url.endswith(email_hash))
  
  
  class TestGravatarTemplateTags(TestCase):
      def test_gravatar_url(self):
          email = 'matt@automattic.com'
          context = Context({'email': email})
  
          t = Template("{% load gravatar %}{% gravatar_url email %}")
          rendered = t.render(context)
  
          self.assertEqual(rendered, escape(get_gravatar_url(email)))
  
      def test_gravatar_img(self):
          # Some defaults for testing
          email = 'matt@automattic.com'
          alt_text = 'some alt text'
          css_class = 'gravatar-thumb'
          size = 250
  
          # Build context
          context = Context({
              'email': email,
              'size': size,
              'alt_text': alt_text,
              'css_class': css_class,
          })
  
          # Default behavior
          t = Template("{% load gravatar %}{% gravatar email %}")
          rendered = t.render(context)
  
          self.assertTrue(escape(get_gravatar_url(email)) in rendered)
          self.assertTrue('class="gravatar"' in rendered)
          self.assertTrue('alt=""' in rendered)
  
          t = Template("{% load gravatar %}{% gravatar email size alt_text css_class %}")
          rendered = t.render(context)
  
          self.assertTrue('width="%s"' % (size,) in rendered)
          self.assertTrue('height="%s"' % (size,) in rendered)
          self.assertTrue('alt="%s"' % (alt_text,) in rendered)
          self.assertTrue('class="%s"' % (css_class,) in rendered)
  
      def test_gravatar_user_url(self):
          # class with email attribute
          class user:
              email = 'bouke@webatoom.nl'
  
          context = Context({'user': user})
  
          t = Template("{% load gravatar %}{% gravatar_url user %}")
          rendered = t.render(context)
  
          self.assertEqual(rendered, escape(get_gravatar_url(user.email)))
  
      def test_gravatar_user_img(self):
          # class with email attribute
          class user:
              email = 'bouke@webatoom.nl'
  
          context = Context({'user': user})
  
          t = Template("{% load gravatar %}{% gravatar user %}")
          rendered = t.render(context)
  
          self.assertTrue(escape(get_gravatar_url(user.email)) in rendered)
  
      def test_invalid_input(self):
          context = Context({'email': None})
  
          t = Template("{% load gravatar %}{% gravatar email %}")
          rendered = t.render(context)
  
          self.assertEqual("", rendered, "Invalid input should return empty result")
  
      def test_gravatar_profile_url(self):
          """
          Verify the profile url generated from template gravatar_profile_url tag.
          """
          # class with email attribute
          class user:
              email = 'bouke@webatoom.nl'
  
          context = Context({'user': user})
  
          t = Template("{% load gravatar %}{% gravatar_profile_url user %}")
          rendered = t.render(context)
  
          self.assertEqual(rendered, escape(get_gravatar_profile_url(user.email)))
  