Migrate get_or_create doctests. Thanks to Alex Gaynor.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13785 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/get_or_create/tests.py

@@ -0,0 +1,52 @@
+from datetime import date
+
+from django.db import IntegrityError
+from django.test import TestCase
+
+from models import Person, ManualPrimaryKeyTest
+
+
+class GetOrCreateTests(TestCase):
+    def test_get_or_create(self):
+        p = Person.objects.create(
+            first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)
+        )
+
+        p, created = Person.objects.get_or_create(
+            first_name="John", last_name="Lennon", defaults={
+                "birthday": date(1940, 10, 9)
+            }
+        )
+        self.assertFalse(created)
+        self.assertEqual(Person.objects.count(), 1)
+
+        p, created = Person.objects.get_or_create(
+            first_name='George', last_name='Harrison', defaults={
+                'birthday': date(1943, 2, 25)
+            }
+        )
+        self.assertTrue(created)
+        self.assertEqual(Person.objects.count(), 2)
+
+        # If we execute the exact same statement, it won't create a Person.
+        p, created = Person.objects.get_or_create(
+            first_name='George', last_name='Harrison', defaults={
+                'birthday': date(1943, 2, 25)
+            }
+        )
+        self.assertFalse(created)
+        self.assertEqual(Person.objects.count(), 2)
+
+        # If you don't specify a value or default value for all required
+        # fields, you will get an error.
+        self.assertRaises(IntegrityError,
+            Person.objects.get_or_create, first_name="Tom", last_name="Smith"
+        )
+
+        # If you specify an existing primary key, but different other fields,
+        # then you will get an error and data will not be updated.
+        m = ManualPrimaryKeyTest.objects.create(id=1, data="Original")
+        self.assertRaises(IntegrityError,
+            ManualPrimaryKeyTest.objects.get_or_create, id=1, data="Different"
+        )
+        self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")