1 files changed, 66 insertions, 0 deletions
diff --git a/tests/get_or_create/tests.py b/tests/get_or_create/tests.py
new file mode 100644
index 0000000000..1e300fbb4d
--- /dev/null
+++ b/tests/get_or_create/tests.py
@@ -0,0 +1,66 @@
+from __future__ import absolute_import
+
+from datetime import date
+import traceback
+
+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")
+
+        # get_or_create should raise IntegrityErrors with the full traceback.
+        # This is tested by checking that a known method call is in the traceback.
+        # We cannot use assertRaises/assertRaises here because we need to inspect
+        # the actual traceback. Refs #16340.
+        try:
+            ManualPrimaryKeyTest.objects.get_or_create(id=1, data="Different")
+        except IntegrityError as e:
+            formatted_traceback = traceback.format_exc()
+            self.assertIn('obj.save', formatted_traceback)
+