Fix regression where 'default_extension' no longer accepted as positional argument

CHANGES.rst

@@ -3,7 +3,9 @@ Changes
 
 In next release ...
 
--
+- Fix a regression where `default_extension` was no longer permitted
+  as a positional argument to `PageTemplateLoader`.
+  (`#411 <https://github.com/malthe/chameleon/issues/411>`_)
 
 4.5.0 (2024-01-18)
 ------------------

src/chameleon/tests/test_loader.py

@@ -7,9 +7,9 @@
 
 
 class LoadTests:
-    def _makeOne(self, search_path=None, **kwargs):
+    def _makeOne(self, *args, **kwargs):
         klass = self._getTargetClass()
-        return klass(search_path, **kwargs)
+        return klass(*args, **kwargs)
 
     def _getTargetClass(self):
         from chameleon.loader import TemplateLoader
@@ -24,6 +24,15 @@ def test_load_relative(self):
             result.filename,
             os.path.join(here, 'hello_world.pt'))
 
+    def test_load_relative_default_extension(self):
+        import os
+        here = os.path.join(os.path.dirname(__file__), "inputs")
+        loader = self._makeOne([here], ".pt")
+        result = self._load(loader, 'hello_world')
+        self.assertEqual(
+            result.filename,
+            os.path.join(here, 'hello_world.pt'))
+
     def test_consecutive_loads(self):
         import os
         here = os.path.join(os.path.dirname(__file__), "inputs")
@@ -140,6 +149,15 @@ def _load(self, loader, spec):
         return loader.load(spec, template.PageTemplateFile)
 
 
+class ZPTLoadPageTests(unittest.TestCase, LoadTests):
+    def _getTargetClass(self):
+        from chameleon.zpt.loader import TemplateLoader
+        return TemplateLoader
+
+    def _load(self, loader, spec):
+        return loader.load(spec)
+
+
 class ModuleLoadTests(unittest.TestCase):
     def _makeOne(self, *args, **kwargs):
         from chameleon.loader import ModuleLoader

src/chameleon/zpt/loader.py

@@ -28,6 +28,7 @@ class TemplateLoader(BaseLoader):
     def __init__(
         self,
         search_path: Sequence[str] | str | None = None,
+        default_extension: str | None = None,
         *,
         formats: _FormatsMapping | None = None,
         **kwargs: Any
@@ -36,7 +37,7 @@ def __init__(
         if formats is not None:
             self.formats = formats
 
-        super().__init__(search_path, **kwargs)
+        super().__init__(search_path, default_extension, **kwargs)
 
     @overload  # type: ignore[override]
     def load(