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.

tests/model_options/test_tablespaces.py

@@ -0,0 +1,128 @@
+from __future__ import unicode_literals
+
+from django.apps import apps
+from django.conf import settings
+from django.db import connection
+from django.core.management.color import no_style
+from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
+
+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
+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['model_options'].models.copy()
+
+        for model in Article, Authors, Reviewers, Scientist:
+            model._meta.managed = True
+
+    def tearDown(self):
+        for model in Article, Authors, Reviewers, Scientist:
+            model._meta.managed = False
+
+        apps.app_configs['model_options'].models = self._old_models
+        apps.all_models['model_options'] = self._old_models
+        apps.clear_cache()
+
+    def assertNumContains(self, haystack, needle, count):
+        real_count = haystack.count(needle)
+        self.assertEqual(real_count, count, "Found %d instances of '%s', "
+                "expected %d" % (real_count, needle, count))
+
+    @skipUnlessDBFeature('supports_tablespaces')
+    def test_tablespace_for_model(self):
+        sql = sql_for_table(Scientist).lower()
+        if settings.DEFAULT_INDEX_TABLESPACE:
+            # 1 for the table
+            self.assertNumContains(sql, 'tbl_tbsp', 1)
+            # 1 for the index on the primary key
+            self.assertNumContains(sql, settings.DEFAULT_INDEX_TABLESPACE, 1)
+        else:
+            # 1 for the table + 1 for the index on the primary key
+            self.assertNumContains(sql, 'tbl_tbsp', 2)
+
+    @skipIfDBFeature('supports_tablespaces')
+    def test_tablespace_ignored_for_model(self):
+        # No tablespace-related SQL
+        self.assertEqual(sql_for_table(Scientist),
+                         sql_for_table(ScientistRef))
+
+    @skipUnlessDBFeature('supports_tablespaces')
+    def test_tablespace_for_indexed_field(self):
+        sql = sql_for_table(Article).lower()
+        if settings.DEFAULT_INDEX_TABLESPACE:
+            # 1 for the table
+            self.assertNumContains(sql, 'tbl_tbsp', 1)
+            # 1 for the primary key + 1 for the index on code
+            self.assertNumContains(sql, settings.DEFAULT_INDEX_TABLESPACE, 2)
+        else:
+            # 1 for the table + 1 for the primary key + 1 for the index on code
+            self.assertNumContains(sql, 'tbl_tbsp', 3)
+
+        # 1 for the index on reference
+        self.assertNumContains(sql, 'idx_tbsp', 1)
+
+    @skipIfDBFeature('supports_tablespaces')
+    def test_tablespace_ignored_for_indexed_field(self):
+        # No tablespace-related SQL
+        self.assertEqual(sql_for_table(Article),
+                         sql_for_table(ArticleRef))
+
+    @skipUnlessDBFeature('supports_tablespaces')
+    def test_tablespace_for_many_to_many_field(self):
+        sql = sql_for_table(Authors).lower()
+        # The join table of the ManyToManyField goes to the model's tablespace,
+        # and its indexes too, unless DEFAULT_INDEX_TABLESPACE is set.
+        if settings.DEFAULT_INDEX_TABLESPACE:
+            # 1 for the table
+            self.assertNumContains(sql, 'tbl_tbsp', 1)
+            # 1 for the primary key
+            self.assertNumContains(sql, settings.DEFAULT_INDEX_TABLESPACE, 1)
+        else:
+            # 1 for the table + 1 for the index on the primary key
+            self.assertNumContains(sql, 'tbl_tbsp', 2)
+        self.assertNumContains(sql, 'idx_tbsp', 0)
+
+        sql = sql_for_index(Authors).lower()
+        # The ManyToManyField declares no db_tablespace, its indexes go to
+        # the model's tablespace, unless DEFAULT_INDEX_TABLESPACE is set.
+        if settings.DEFAULT_INDEX_TABLESPACE:
+            self.assertNumContains(sql, settings.DEFAULT_INDEX_TABLESPACE, 2)
+        else:
+            self.assertNumContains(sql, 'tbl_tbsp', 2)
+        self.assertNumContains(sql, 'idx_tbsp', 0)
+
+        sql = sql_for_table(Reviewers).lower()
+        # The join table of the ManyToManyField goes to the model's tablespace,
+        # and its indexes too, unless DEFAULT_INDEX_TABLESPACE is set.
+        if settings.DEFAULT_INDEX_TABLESPACE:
+            # 1 for the table
+            self.assertNumContains(sql, 'tbl_tbsp', 1)
+            # 1 for the primary key
+            self.assertNumContains(sql, settings.DEFAULT_INDEX_TABLESPACE, 1)
+        else:
+            # 1 for the table + 1 for the index on the primary key
+            self.assertNumContains(sql, 'tbl_tbsp', 2)
+        self.assertNumContains(sql, 'idx_tbsp', 0)
+
+        sql = sql_for_index(Reviewers).lower()
+        # The ManyToManyField declares db_tablespace, its indexes go there.
+        self.assertNumContains(sql, 'tbl_tbsp', 0)
+        self.assertNumContains(sql, 'idx_tbsp', 2)