Raised a warning when using the legacy TEMPLATE_* settings.

All tests now rely on TEMPLATES.

django/template/utils.py

@@ -1,14 +1,14 @@
 from collections import Counter, OrderedDict
 import os
 import sys
-# import warnings
+import warnings
 
 from django.apps import apps
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.utils import lru_cache
 from django.utils import six
-# from django.utils.deprecation import RemovedInDjango20Warning
+from django.utils.deprecation import RemovedInDjango20Warning
 from django.utils.functional import cached_property
 from django.utils.module_loading import import_string
 
@@ -32,12 +32,10 @@ class EngineHandler(object):
             self._templates = settings.TEMPLATES
 
         if not self._templates:
-            # TODO: re-enable this warning once the entire test suite has been
-            #       updated to rely on TEMPLATES instead of legacy settings.
-            # warnings.warn(
-            #     "You haven't defined a TEMPLATES setting. You must do so "
-            #     "before upgrading to Django 2.0. Otherwise Django will be "
-            #     "unable to load templates.", RemovedInDjango20Warning)
+            warnings.warn(
+                "You haven't defined a TEMPLATES setting. You must do so "
+                "before upgrading to Django 2.0. Otherwise Django will be "
+                "unable to load templates.", RemovedInDjango20Warning)
             self._templates = [
                 {
                     'BACKEND': 'django.template.backends.django.DjangoTemplates',

tests/runtests.py

@@ -25,11 +25,11 @@ warnings.simplefilter("error", RemovedInDjango20Warning)
 
 CONTRIB_MODULE_PATH = 'django.contrib'
 
-TEST_TEMPLATE_DIR = 'templates'
-
 CONTRIB_DIR = os.path.dirname(upath(contrib.__file__))
 RUNTESTS_DIR = os.path.abspath(os.path.dirname(upath(__file__)))
 
+TEMPLATE_DIR = os.path.join(RUNTESTS_DIR, 'templates')
+
 TEMP_DIR = tempfile.mkdtemp(prefix='django_')
 os.environ['DJANGO_TEST_TEMP_DIR'] = TEMP_DIR
 
@@ -101,7 +101,9 @@ def setup(verbosity, test_labels):
     state = {
         'INSTALLED_APPS': settings.INSTALLED_APPS,
         'ROOT_URLCONF': getattr(settings, "ROOT_URLCONF", ""),
+        # Remove the following line in Django 2.0.
         'TEMPLATE_DIRS': settings.TEMPLATE_DIRS,
+        'TEMPLATES': settings.TEMPLATES,
         'LANGUAGE_CODE': settings.LANGUAGE_CODE,
         'STATIC_URL': settings.STATIC_URL,
         'STATIC_ROOT': settings.STATIC_ROOT,
@@ -113,7 +115,24 @@ def setup(verbosity, test_labels):
     settings.ROOT_URLCONF = 'urls'
     settings.STATIC_URL = '/static/'
     settings.STATIC_ROOT = os.path.join(TEMP_DIR, 'static')
-    settings.TEMPLATE_DIRS = (os.path.join(RUNTESTS_DIR, TEST_TEMPLATE_DIR),)
+    # Remove the following line in Django 2.0.
+    settings.TEMPLATE_DIRS = (TEMPLATE_DIR,)
+    settings.TEMPLATES = [{
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [TEMPLATE_DIR],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.contrib.auth.context_processors.auth',
+                'django.template.context_processors.debug',
+                'django.template.context_processors.i18n',
+                'django.template.context_processors.media',
+                'django.template.context_processors.static',
+                'django.template.context_processors.tz',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    }]
     settings.LANGUAGE_CODE = 'en'
     settings.SITE_ID = 1
     settings.MIDDLEWARE_CLASSES = ALWAYS_MIDDLEWARE_CLASSES