Cleaned up template loader tests.

tests/template_tests/test_engine.py

@@ -0,0 +1,125 @@
+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 RemovedInDjango20Warning
+
+from .utils import ROOT, TEMPLATE_DIR
+
+OTHER_DIR = os.path.join(ROOT, 'other_templates')
+
+
+@ignore_warnings(category=RemovedInDjango20Warning)
+class DeprecatedRenderToStringTest(SimpleTestCase):
+
+    def setUp(self):
+        self.engine = Engine(dirs=[TEMPLATE_DIR])
+
+    def test_basic_context(self):
+        self.assertEqual(
+            self.engine.render_to_string('test_context.html', {'obj': 'test'}),
+            '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):
+
+    def test_debug_nodelist_name(self):
+        engine = Engine(dirs=[TEMPLATE_DIR], debug=True)
+        template_name = 'index.html'
+        template = engine.get_template(template_name)
+        name = template.nodelist[0].source[0].name
+        self.assertTrue(name.endswith(template_name))
+
+    def test_origin(self):
+        engine = Engine(dirs=[TEMPLATE_DIR], debug=True)
+        template = engine.get_template('index.html')
+        self.assertEqual(template.origin.loadname, 'index.html')
+
+    def test_origin_debug_false(self):
+        engine = Engine(dirs=[TEMPLATE_DIR], debug=False)
+        template = engine.get_template('index.html')
+        self.assertEqual(template.origin, None)
+
+    def test_loader_priority(self):
+        """
+        #21460 -- Check that the order of template loader works.
+        """
+        loaders = [
+            'django.template.loaders.filesystem.Loader',
+            'django.template.loaders.app_directories.Loader',
+        ]
+        engine = Engine(dirs=[OTHER_DIR, TEMPLATE_DIR], loaders=loaders)
+        template = engine.get_template('priority/foo.html')
+        self.assertEqual(template.render(Context()), 'priority\n')
+
+    def test_cached_loader_priority(self):
+        """
+        Check that the order of template loader works. Refs #21460.
+        """
+        loaders = [
+            ('django.template.loaders.cached.Loader', [
+                'django.template.loaders.filesystem.Loader',
+                'django.template.loaders.app_directories.Loader',
+            ]),
+        ]
+        engine = Engine(dirs=[OTHER_DIR, TEMPLATE_DIR], loaders=loaders)
+
+        template = engine.get_template('priority/foo.html')
+        self.assertEqual(template.render(Context()), 'priority\n')
+
+        template = engine.get_template('priority/foo.html')
+        self.assertEqual(template.render(Context()), 'priority\n')
+
+
+@ignore_warnings(category=RemovedInDjango20Warning)
+class TemplateDirsOverrideTests(SimpleTestCase):
+    DIRS = ((OTHER_DIR, ), [OTHER_DIR])
+
+    def setUp(self):
+        self.engine = Engine()
+
+    def test_render_to_string(self):
+        for dirs in self.DIRS:
+            self.assertEqual(
+                self.engine.render_to_string('test_dirs.html', dirs=dirs),
+                'spam eggs\n',
+            )
+
+    def test_get_template(self):
+        for dirs in self.DIRS:
+            template = self.engine.get_template('test_dirs.html', dirs=dirs)
+            self.assertEqual(template.render(Context()), 'spam eggs\n')
+
+    def test_select_template(self):
+        for dirs in self.DIRS:
+            template = self.engine.select_template(['test_dirs.html'], dirs=dirs)
+            self.assertEqual(template.render(Context()), 'spam eggs\n')