Removed dictionary and context_instance parameters for render functions.

Per deprecation timeline.

tests/template_tests/test_engine.py

@@ -2,22 +2,17 @@ import os
 
 from django.template import Context
 from django.template.engine import Engine
-from django.test import SimpleTestCase, ignore_warnings
-from django.utils.deprecation import RemovedInDjango110Warning
+from django.test import SimpleTestCase
 
 from .utils import ROOT, TEMPLATE_DIR
 
 OTHER_DIR = os.path.join(ROOT, 'other_templates')
 
 
-@ignore_warnings(category=RemovedInDjango110Warning)
-class DeprecatedRenderToStringTest(SimpleTestCase):
+class RenderToStringTest(SimpleTestCase):
 
     def setUp(self):
-        self.engine = Engine(
-            dirs=[TEMPLATE_DIR],
-            libraries={'custom': 'template_tests.templatetags.custom'},
-        )
+        self.engine = Engine(dirs=[TEMPLATE_DIR])
 
     def test_basic_context(self):
         self.assertEqual(
@@ -25,33 +20,6 @@ class DeprecatedRenderToStringTest(SimpleTestCase):
             'obj:test\n',
         )
 
-    def test_existing_context_kept_clean(self):
-        context = Context({'obj': 'before'})
-        output = self.engine.render_to_string(
-            'test_context.html', {'obj': 'after'}, context_instance=context,
-        )
-        self.assertEqual(output, 'obj:after\n')
-        self.assertEqual(context['obj'], 'before')
-
-    def test_no_empty_dict_pushed_to_stack(self):
-        """
-        #21741 -- An empty dict should not be pushed to the context stack when
-        render_to_string is called without a context argument.
-        """
-
-        # The stack should have a length of 1, corresponding to the builtins
-        self.assertEqual(
-            '1',
-            self.engine.render_to_string('test_context_stack.html').strip(),
-        )
-        self.assertEqual(
-            '1',
-            self.engine.render_to_string(
-                'test_context_stack.html',
-                context_instance=Context()
-            ).strip(),
-        )
-
 
 class LoaderTests(SimpleTestCase):