[1.2.X] Converted order_with_respect_to to unittests. We have always been at war with doctests. Backport of [14043].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14044 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/order_with_respect_to/tests.py

@@ -0,0 +1,62 @@
+from operator import attrgetter
+
+from django.test import TestCase
+
+from models import Question, Answer
+
+
+class OrderWithRespectToTests(TestCase):
+    def test_basic(self):
+        q1 = Question.objects.create(text="Which Beatle starts with the letter 'R'?")
+        q2 = Question.objects.create(text="What is your name?")
+        
+        Answer.objects.create(text="John", question=q1)
+        Answer.objects.create(text="Jonno", question=q2)
+        Answer.objects.create(text="Paul", question=q1)
+        Answer.objects.create(text="Paulo", question=q2)
+        Answer.objects.create(text="George", question=q1)
+        Answer.objects.create(text="Ringo", question=q1)
+        
+        # The answers will always be ordered in the order they were inserted.
+        self.assertQuerysetEqual(
+            q1.answer_set.all(), [
+                "John", "Paul", "George", "Ringo",
+            ],
+            attrgetter("text"),
+        )
+        
+        # We can retrieve the answers related to a particular object, in the
+        # order they were created, once we have a particular object.
+        a1 = Answer.objects.filter(question=q1)[0]
+        self.assertEqual(a1.text, "John")
+        a2 = a1.get_next_in_order()
+        self.assertEqual(a2.text, "Paul")
+        a4 = list(Answer.objects.filter(question=q1))[-1]
+        self.assertEqual(a4.text, "Ringo")
+        self.assertEqual(a4.get_previous_in_order().text, "George")
+        
+        # Determining (and setting) the ordering for a particular item is also
+        # possible.
+        id_list = [o.pk for o in q1.answer_set.all()]
+        self.assertEqual(a2.question.get_answer_order(), id_list)
+        
+        a5 = Answer.objects.create(text="Number five", question=q1)
+        
+        # It doesn't matter which answer we use to check the order, it will
+        # always be the same.
+        self.assertEqual(
+            a2.question.get_answer_order(), a5.question.get_answer_order()
+        )
+        
+        # The ordering can be altered:
+        id_list = [o.pk for o in q1.answer_set.all()]
+        x = id_list.pop()
+        id_list.insert(-1, x)
+        self.assertNotEqual(a5.question.get_answer_order(), id_list)
+        a5.question.set_answer_order(id_list)
+        self.assertQuerysetEqual(
+            q1.answer_set.all(), [
+                "John", "Paul", "George", "Number five", "Ringo"
+            ],
+            attrgetter("text")
+        )