[python] Add mock API tests for extensible enum with special word member names

.chronus/changes/python-special-words-extensible-strings-2026-3-6-9-28-8.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add mock API test coverage for extensible enum with special word member names in special-words spec.

packages/http-client-python/generator/pygen/preprocess/__init__.py

@@ -4,6 +4,7 @@
 # license information.
 # --------------------------------------------------------------------------
 """The preprocessing autorest plugin."""
+
 import copy
 from typing import Callable, Any, Optional
 
@@ -264,7 +265,7 @@ def update_types(self, yaml_data: list[dict[str, Any]]) -> None:
                     property["clientName"].lower(), PadType.PROPERTY, property
                 )
                 add_redefined_builtin_info(property["clientName"], property)
-            if type.get("name"):
+            if type.get("name") and type["type"] != "enumvalue":
                 pad_type = PadType.MODEL if type["type"] == "model" else PadType.ENUM_CLASS
                 name = self.pad_reserved_words(type["name"], pad_type, type)
                 type["name"] = name[0].upper() + name[1:]

packages/http-client-python/generator/test/azure/mock_api_tests/asynctests/test_special_words_async.py

@@ -63,3 +63,9 @@ async def test_model_properties_dict_methods(client: SpecialWordsClient):
 @pytest.mark.asyncio
 async def test_model_properties_with_list(client: SpecialWordsClient):
     await client.model_properties.with_list(models.ModelWithList(list="ok"))
+
+
+@pytest.mark.asyncio
+async def test_extensible_strings(client: SpecialWordsClient):
+    result = await client.extensible_strings.put_extensible_string_value(body=models.ExtensibleString.CLASS)
+    assert result == '"class"'

packages/http-client-python/generator/test/azure/mock_api_tests/test_special_words.py

@@ -56,3 +56,8 @@ def test_model_properties_dict_methods(client: SpecialWordsClient):
 
 def test_model_properties_with_list(client: SpecialWordsClient):
     client.model_properties.with_list(models.ModelWithList(list="ok"))
+
+
+def test_extensible_strings(client: SpecialWordsClient):
+    result = client.extensible_strings.put_extensible_string_value(body=models.ExtensibleString.CLASS)
+    assert result == '"class"'

packages/http-client-python/generator/test/unbranded/mock_api_tests/asynctests/test_special_words_async.py

@@ -64,3 +64,9 @@ async def test_model_properties_dict_methods(client: SpecialWordsClient):
 @pytest.mark.asyncio
 async def test_model_properties_with_list(client: SpecialWordsClient):
     await client.model_properties.with_list(model_properties_models.ModelWithList(list="ok"))
+
+
+@pytest.mark.asyncio
+async def test_extensible_strings(client: SpecialWordsClient):
+    result = await client.extensible_strings.put_extensible_string_value(body="class")
+    assert result == '"class"'

packages/http-client-python/generator/test/unbranded/mock_api_tests/test_special_words.py

@@ -58,3 +58,8 @@ def test_model_properties_dict_methods(client: SpecialWordsClient):
 
 def test_model_properties_with_list(client: SpecialWordsClient):
     client.model_properties.with_list(model_properties_models.ModelWithList(list="ok"))
+
+
+def test_extensible_strings(client: SpecialWordsClient):
+    result = client.extensible_strings.put_extensible_string_value(body="class")
+    assert result == '"class"'

packages/http-client-python/package.json

@@ -94,7 +94,7 @@
     "@typespec/sse": "~0.79.0",
     "@typespec/streams": "~0.79.0",
     "@typespec/xml": "~0.79.0",
-    "@typespec/http-specs": "0.1.0-alpha.33-dev.2",
+    "@typespec/http-specs": "0.1.0-alpha.33-dev.5",
     "@types/js-yaml": "~4.0.5",
     "@types/node": "~25.0.2",
     "@types/semver": "7.5.8",