Refs #24121 -- Added __repr__() to Engine

django/template/engine.py

@@ -52,6 +52,26 @@ class Engine:
         self.builtins = self.default_builtins + builtins
         self.template_builtins = self.get_template_builtins(self.builtins)
 
+    def __repr__(self):
+        return (
+            '<%s:%s app_dirs=%s%s debug=%s loaders=%s string_if_invalid=%s '
+            'file_charset=%s%s%s autoescape=%s>'
+        ) % (
+            self.__class__.__qualname__,
+            '' if not self.dirs else ' dirs=%s' % repr(self.dirs),
+            self.app_dirs,
+            ''
+            if not self.context_processors
+            else ' context_processors=%s' % repr(self.context_processors),
+            self.debug,
+            repr(self.loaders),
+            repr(self.string_if_invalid),
+            repr(self.file_charset),
+            '' if not self.libraries else ' libraries=%s' % repr(self.libraries),
+            '' if not self.builtins else ' builtins=%s' % repr(self.builtins),
+            repr(self.autoescape),
+        )
+
     @staticmethod
     @functools.lru_cache()
     def get_default():

tests/template_tests/test_engine.py

@@ -10,6 +10,43 @@ from .utils import ROOT, TEMPLATE_DIR
 OTHER_DIR = os.path.join(ROOT, 'other_templates')
 
 
+class EngineTest(SimpleTestCase):
+    def test_repr_empty(self):
+        engine = Engine()
+        self.assertEqual(
+            repr(engine),
+            "<Engine: app_dirs=False debug=False loaders=[("
+            "'django.template.loaders.cached.Loader', "
+            "['django.template.loaders.filesystem.Loader'])] "
+            "string_if_invalid='' file_charset='utf-8' builtins=["
+            "'django.template.defaulttags', 'django.template.defaultfilters', "
+            "'django.template.loader_tags'] autoescape=True>"
+        )
+
+    def test_repr(self):
+        engine = Engine(
+            dirs=[TEMPLATE_DIR],
+            context_processors=['django.template.context_processors.debug'],
+            debug=True,
+            loaders=['django.template.loaders.filesystem.Loader'],
+            string_if_invalid='x',
+            file_charset='utf-16',
+            libraries={'custom': 'template_tests.templatetags.custom'},
+            autoescape=False,
+        )
+        self.assertEqual(
+            repr(engine),
+            f"<Engine: dirs=[{TEMPLATE_DIR!r}] app_dirs=False "
+            "context_processors=['django.template.context_processors.debug'] "
+            "debug=True loaders=['django.template.loaders.filesystem.Loader'] "
+            "string_if_invalid='x' file_charset='utf-16' "
+            "libraries={'custom': 'template_tests.templatetags.custom'} "
+            "builtins=['django.template.defaulttags', "
+            "'django.template.defaultfilters', 'django.template.loader_tags'] "
+            "autoescape=False>"
+        )
+
+
 class RenderToStringTest(SimpleTestCase):
 
     def setUp(self):