[1.7.x] Created a new tests folder (`model_options`).

And moved `tablespaces` option tests to it.
The new folder can be used to test models/options, like the new option
added in refs #22778.

Backport of 5a3ae7e260 from master

tests/model_options/models/tablespaces.py

@@ -23,7 +23,7 @@ class Scientist(models.Model):
     name = models.CharField(max_length=50)
 
     class Meta:
-        db_table = 'tablespaces_scientistref'
+        db_table = 'model_options_scientistref'
         db_tablespace = 'tbl_tbsp'
         managed = False
 
@@ -35,14 +35,14 @@ class Article(models.Model):
     reviewers = models.ManyToManyField(Scientist, related_name='articles_reviewed_set', db_tablespace='idx_tbsp')
 
     class Meta:
-        db_table = 'tablespaces_articleref'
+        db_table = 'model_options_articleref'
         db_tablespace = 'tbl_tbsp'
         managed = False
 
 # Also set the tables for automatically created models
 
 Authors = Article._meta.get_field('authors').rel.through
-Authors._meta.db_table = 'tablespaces_articleref_authors'
+Authors._meta.db_table = 'model_options_articleref_authors'
 
 Reviewers = Article._meta.get_field('reviewers').rel.through
-Reviewers._meta.db_table = 'tablespaces_articleref_reviewers'
+Reviewers._meta.db_table = 'model_options_articleref_reviewers'

tests/model_options/test_tablespaces.py

@@ -6,27 +6,29 @@ from django.db import connection
 from django.core.management.color import no_style
 from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
 
-from .models import Article, ArticleRef, Authors, Reviewers, Scientist, ScientistRef
+from .models.tablespaces import (Article, ArticleRef, Authors, Reviewers,
+    Scientist, ScientistRef)
+
+
+def sql_for_table(model):
+    return '\n'.join(connection.creation.sql_create_model(model,
+                                                          no_style())[0])
+
+
+def sql_for_index(model):
+    return '\n'.join(connection.creation.sql_indexes_for_model(model,
+                                                               no_style()))
+
 
 # We can't test the DEFAULT_TABLESPACE and DEFAULT_INDEX_TABLESPACE settings
 # because they're evaluated when the model class is defined. As a consequence,
 # @override_settings doesn't work, and the tests depend
-
-
-def sql_for_table(model):
-    return '\n'.join(connection.creation.sql_create_model(model, no_style())[0])
-
-
-def sql_for_index(model):
-    return '\n'.join(connection.creation.sql_indexes_for_model(model, no_style()))
-
-
 class TablespacesTests(TestCase):
 
     def setUp(self):
         # The unmanaged models need to be removed after the test in order to
         # prevent bad interactions with the flush operation in other tests.
-        self._old_models = apps.app_configs['tablespaces'].models.copy()
+        self._old_models = apps.app_configs['model_options'].models.copy()
 
         for model in Article, Authors, Reviewers, Scientist:
             model._meta.managed = True
@@ -35,8 +37,8 @@ class TablespacesTests(TestCase):
         for model in Article, Authors, Reviewers, Scientist:
             model._meta.managed = False
 
-        apps.app_configs['tablespaces'].models = self._old_models
+        apps.app_configs['model_options'].models = self._old_models
-        apps.all_models['tablespaces'] = self._old_models
+        apps.all_models['model_options'] = self._old_models
         apps.clear_cache()
 
     def assertNumContains(self, haystack, needle, count):