old_contents: from django.test import TestCase
  from forum.models import User, Thread, Post, PostRevision
  
  class PostTestCase(TestCase):
      def setUp(self):
          """Prepare for testing posts."""
          user = User.objects.create(username='SampleGuy')
          author = User.objects.create(username='RelevantAuthor')
  
          thread = Thread.objects.create(title='This is it')
          post = Post.objects.create(thread=thread)
  
          PostRevision.objects.create(post=post, text='A', author=author)
          for content in ['B', 'C', 'D', 'E']:
              PostRevision.objects.create(post=post, text=content, author=user)
  
          # Create unrelated thread to find possible issues in query.
          unrelated_thread = Thread.objects.create(title='Unrelated thread')
          unrelated_post = Post.objects.create(thread=unrelated_thread)
          PostRevision.objects.create(post=unrelated_post, text='F', author=user)
  
          self.post = post
          self.author = author
  
      def test_first_revision(self):
          """First revision should be the initial revision."""
          self.assertEqual(self.post.first_revision().text, 'A')
  
      def test_last_revision(self):
          """Last revision should be the final revision."""
          self.assertEqual(self.post.last_revision().text, 'E')
  
      def test_author(self):
          self.assertEqual(self.post.author(), self.author)
  
new_contents: from django.test import TestCase
  from forum.models import User, Thread, Post, PostRevision
  
  class PostTestCase(TestCase):
      def setUp(self):
          """Prepare for testing posts."""
          user = User.objects.create(username='SampleGuy')
          author = User.objects.create(username='RelevantAuthor')
  
          thread = Thread.objects.create(title='This is it')
          post = Post.objects.create(thread=thread)
  
          PostRevision.objects.create(post=post, text='A', author=author)
          for content in ['B', 'C', 'D', 'E']:
              PostRevision.objects.create(post=post, text=content, author=user)
  
          # Create unrelated thread to find possible issues in query.
          unrelated_thread = Thread.objects.create(title='Unrelated thread')
          unrelated_post = Post.objects.create(thread=unrelated_thread)
          PostRevision.objects.create(post=unrelated_post, text='F', author=user)
  
          self.post = post
          self.author = author
  
      def test_first_revision(self):
          """First revision should be the initial revision."""
          self.assertEqual(self.post.first_revision().text, 'A')
  
      def test_last_revision(self):
          """Last revision should be the final revision."""
          self.assertEqual(self.post.last_revision().text, 'E')
  
      def test_author(self):
          self.assertEqual(self.post.author(), self.author)
  
      def test_text(self):
          self.assertEqual(self.post.text(), 'E')
  
subject: Test text() method.