import sys from django.template import Context, Engine, TemplateDoesNotExist, TemplateSyntaxError from django.template.base import UNKNOWN_SOURCE from django.test import SimpleTestCase, override_settings from django.urls import NoReverseMatch from django.utils import translation from django.utils.html import escape class TemplateTestMixin: def _engine(self, **kwargs): return Engine(debug=self.debug_engine, **kwargs) def test_string_origin(self): template = self._engine().from_string("string template") self.assertEqual(template.origin.name, UNKNOWN_SOURCE) self.assertIsNone(template.origin.loader_name) self.assertEqual(template.source, "string template") @override_settings(SETTINGS_MODULE=None) def test_url_reverse_no_settings_module(self): """ #9005 -- url tag shouldn't require settings.SETTINGS_MODULE to be set. """ t = self._engine().from_string("{% url will_not_match %}") c = Context() with self.assertRaises(NoReverseMatch): t.render(c) def test_url_reverse_view_name(self): """ #19827 -- url tag should keep original strack trace when reraising exception. """ t = self._engine().from_string("{% url will_not_match %}") c = Context() try: t.render(c) except NoReverseMatch: tb = sys.exc_info()[2] depth = 0 while tb.tb_next is not None: tb = tb.tb_next depth += 1 self.assertGreater( depth, 5, "The traceback context was lost when reraising the traceback." ) def test_no_wrapped_exception(self): """ # 16770 -- The template system doesn't wrap exceptions, but annotates them. """ engine = self._engine() c = Context({"coconuts": lambda: 42 / 0}) t = engine.from_string("{{ coconuts }}") with self.assertRaises(ZeroDivisionError) as e: t.render(c) if self.debug_engine: debug = e.exception.template_debug self.assertEqual(debug["start"], 0) self.assertEqual(debug["end"], 14) def test_invalid_block_suggestion(self): """ Error messages should include the unexpected block name and be in all English. """ engine = self._engine() msg = ( "Invalid block tag on line 1: 'endblock', expected 'elif', 'else' " "or 'endif'. Did you forget to register or load this tag?" ) with self.settings(USE_I18N=True), translation.override("de"): with self.assertRaisesMessage(TemplateSyntaxError, msg): engine.from_string("{% if 1 %}lala{% endblock %}{% endif %}") def test_unknown_block_tag(self): engine = self._engine() msg = ( "Invalid block tag on line 1: 'foobar'. Did you forget to " "register or load this tag?" ) with self.assertRaisesMessage(TemplateSyntaxError, msg): engine.from_string("lala{% foobar %}") def test_compile_filter_expression_error(self): """ 19819 -- Make sure the correct token is highlighted for FilterExpression errors. """ engine = self._engine() msg = "Could not parse the remainder: '@bar' from 'foo@bar'" with self.assertRaisesMessage(TemplateSyntaxError, msg) as e: engine.from_string("{% if 1 %}{{ foo@bar }}{% endif %}") if self.debug_engine: debug = e.exception.template_debug self.assertEqual((debug["start"], debug["end"]), (10, 23)) self.assertEqual((debug["during"]), "{{ foo@bar }}") def test_compile_tag_error(self): """ Errors raised while compiling nodes should include the token information. """ engine = self._engine( libraries={"bad_tag": "template_tests.templatetags.bad_tag"}, ) with self.assertRaises(RuntimeError) as e: engine.from_string("{% load bad_tag %}{% badtag %}") if self.debug_engine: self.assertEqual(e.exception.template_debug["during"], "{% badtag %}") def test_compile_tag_error_27584(self): engine = self._engine( app_dirs=True, libraries={"tag_27584": "template_tests.templatetags.tag_27584"}, ) t = engine.get_template("27584_parent.html") with self.assertRaises(TemplateSyntaxError) as e: t.render(Context()) if self.debug_engine: self.assertEqual(e.exception.template_debug["during"], "{% badtag %}") def test_compile_tag_error_27956(self): """Errors in a child of {% extends %} are displayed correctly.""" engine = self._engine( app_dirs=True, libraries={"tag_27584": "template_tests.templatetags.tag_27584"}, ) t = engine.get_template("27956_child.html") with self.assertRaises(TemplateSyntaxError) as e: t.render(Context()) if self.debug_engine: self.assertEqual(e.exception.template_debug["during"], "{% badtag %}") def test_render_tag_error_in_extended_block(self): """Errors in extended block are displayed correctly.""" e = self._engine(app_dirs=True) template = e.get_template("test_extends_block_error.html") context = Context() with self.assertRaises(TemplateDoesNotExist) as cm: template.render(context) if self.debug_engine: self.assertEqual( cm.exception.template_debug["during"], escape('{% include "missing.html" %}'), ) def test_super_errors(self): """ #18169 -- NoReverseMatch should not be silence in block.super. """ engine = self._engine(app_dirs=True) t = engine.get_template("included_content.html") with self.assertRaises(NoReverseMatch): t.render(Context()) def test_extends_generic_template(self): """ #24338 -- Allow extending django.template.backends.django.Template objects. """ engine = self._engine() parent = engine.from_string("{% block content %}parent{% endblock %}") child = engine.from_string( "{% extends parent %}{% block content %}child{% endblock %}" ) self.assertEqual(child.render(Context({"parent": parent})), "child") def test_node_origin(self): """ #25848 -- Set origin on Node so debugging tools can determine which template the node came from even if extending or including templates. """ template = self._engine().from_string("content") for node in template.nodelist: self.assertEqual(node.origin, template.origin) def test_render_built_in_type_method(self): """ Templates should not crash when rendering methods for built-in types without required arguments. """ template = self._engine().from_string("{{ description.count }}") self.assertEqual(template.render(Context({"description": "test"})), "") class TemplateTests(TemplateTestMixin, SimpleTestCase): debug_engine = False class DebugTemplateTests(TemplateTestMixin, SimpleTestCase): debug_engine = True