[1.7.x] Further consolidated the model_inheritance tests.

Backport of 3f01e82 from master

tests/model_inheritance_regress/models.py

@@ -73,9 +73,14 @@ class ParkingLot4B(Place, ParkingLot4):
     pass
 
 
+@python_2_unicode_compatible
 class Supplier(models.Model):
+    name = models.CharField(max_length=50)
     restaurant = models.ForeignKey(Restaurant)
 
+    def __str__(self):
+        return self.name
+
 
 class Wholesaler(Supplier):
     retailer = models.ForeignKey(Supplier, related_name='wholesale_supplier')

tests/model_inheritance_regress/tests.py

@@ -466,3 +466,25 @@ class ModelInheritanceTest(TestCase):
                                   serves_pizza=True, serves_hot_dogs=True)
         p = Place.objects.all().select_related('restaurant')[0]
         self.assertIsInstance(p.restaurant.serves_pizza, bool)
+
+    def test_inheritance_select_related(self):
+        # Regression test for #7246
+        r1 = Restaurant.objects.create(
+            name="Nobu", serves_hot_dogs=True, serves_pizza=False
+        )
+        r2 = Restaurant.objects.create(
+            name="Craft", serves_hot_dogs=False, serves_pizza=True
+        )
+        Supplier.objects.create(name="John", restaurant=r1)
+        Supplier.objects.create(name="Jane", restaurant=r2)
+
+        self.assertQuerysetEqual(
+            Supplier.objects.order_by("name").select_related(), [
+                "Jane",
+                "John",
+            ],
+            attrgetter("name")
+        )
+
+        jane = Supplier.objects.order_by("name").select_related("restaurant")[0]
+        self.assertEqual(jane.restaurant.name, "Craft")

tests/model_inheritance_select_related/models.py

@@ -1,37 +0,0 @@
-"""
-Regression tests for the interaction between model inheritance and
-select_related().
-"""
-from __future__ import unicode_literals
-
-from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
-
-
-@python_2_unicode_compatible
-class Place(models.Model):
-    name = models.CharField(max_length=50)
-
-    class Meta:
-        ordering = ('name',)
-
-    def __str__(self):
-        return "%s the place" % self.name
-
-
-@python_2_unicode_compatible
-class Restaurant(Place):
-    serves_sushi = models.BooleanField(default=False)
-    serves_steak = models.BooleanField(default=False)
-
-    def __str__(self):
-        return "%s the restaurant" % self.name
-
-
-@python_2_unicode_compatible
-class Person(models.Model):
-    name = models.CharField(max_length=50)
-    favorite_restaurant = models.ForeignKey(Restaurant)
-
-    def __str__(self):
-        return self.name

tests/model_inheritance_select_related/tests.py

@@ -1,31 +0,0 @@
-from __future__ import unicode_literals
-
-from operator import attrgetter
-
-from django.test import TestCase
-
-from .models import Restaurant, Person
-
-
-class ModelInheritanceSelectRelatedTests(TestCase):
-    def test_inherited_select_related(self):
-        # Regression test for #7246
-        r1 = Restaurant.objects.create(
-            name="Nobu", serves_sushi=True, serves_steak=False
-        )
-        r2 = Restaurant.objects.create(
-            name="Craft", serves_sushi=False, serves_steak=True
-        )
-        Person.objects.create(name="John", favorite_restaurant=r1)
-        Person.objects.create(name="Jane", favorite_restaurant=r2)
-
-        self.assertQuerysetEqual(
-            Person.objects.order_by("name").select_related(), [
-                "Jane",
-                "John",
-            ],
-            attrgetter("name")
-        )
-
-        jane = Person.objects.order_by("name").select_related("favorite_restaurant")[0]
-        self.assertEqual(jane.favorite_restaurant.name, "Craft")