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

.chronus/changes/python-fix-enum-member-reserved-word-suffix-2026-03-06-12-00-00.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+Fix extensible enum member names incorrectly getting an `Enum` suffix when the member name matched a Python reserved word (e.g. `ANDEnum` → `AND`, `CLASSEnum` → `CLASS`).

.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

@@ -6,6 +6,7 @@
 import pytest
 from specialwords.aio import SpecialWordsClient
 from specialwords import models
+from specialwords.extensiblestrings import models as extensible_strings_models
 
 
 @pytest.fixture
@@ -63,3 +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(models.ModelWithList(list="ok"))
+
+
+@pytest.mark.asyncio
+async def test_extensible_strings(client: SpecialWordsClient):
+    for enum_value in extensible_strings_models.ExtensibleString:
+        assert enum_value == await client.extensible_strings.put_extensible_string_value(body=enum_value)

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

@@ -5,6 +5,7 @@
 # --------------------------------------------------------------------------
 import pytest
 from specialwords import SpecialWordsClient, models
+from specialwords.extensiblestrings import models as extensible_strings_models
 
 
 @pytest.fixture
@@ -56,3 +57,8 @@ 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):
+    for enum_value in extensible_strings_models.ExtensibleString:
+        assert enum_value == client.extensible_strings.put_extensible_string_value(body=enum_value)

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

@@ -7,6 +7,7 @@
 from specialwords.aio import SpecialWordsClient
 from specialwords.models import models
 from specialwords.modelproperties import models as model_properties_models
+from specialwords.extensiblestrings import models as extensible_strings_models
 
 
 @pytest.fixture
@@ -64,3 +65,9 @@ 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):
+    for enum_value in extensible_strings_models.ExtensibleString:
+        assert enum_value == await client.extensible_strings.put_extensible_string_value(body=enum_value)

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

@@ -7,6 +7,7 @@
 from specialwords import SpecialWordsClient
 from specialwords.models import models
 from specialwords.modelproperties import models as model_properties_models
+from specialwords.extensiblestrings import models as extensible_strings_models
 
 
 @pytest.fixture
@@ -58,3 +59,8 @@ 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):
+    for enum_value in extensible_strings_models.ExtensibleString:
+        assert enum_value == client.extensible_strings.put_extensible_string_value(body=enum_value)

packages/http-client-python/generator/test/unittests/test_enums.py

@@ -4,6 +4,7 @@
 # license information.
 # --------------------------------------------------------------------------
 from enum import Enum, EnumMeta
+from specialwords.extensiblestrings import models as extensible_strings_models
 
 
 class _CaseInsensitiveEnumMeta(EnumMeta):
@@ -50,3 +51,39 @@ def test_find():
 def test_join():
     assert EnumsWithCallableNames.JOIN == "join"
     assert callable(EnumsWithCallableNames.join)
+
+
+def test_extensible_strings_enum_with_special_words():
+    assert extensible_strings_models.ExtensibleString.AND == "and"
+    assert extensible_strings_models.ExtensibleString.AS == "as"
+    assert extensible_strings_models.ExtensibleString.ASSERT == "assert"
+    assert extensible_strings_models.ExtensibleString.ASYNC == "async"
+    assert extensible_strings_models.ExtensibleString.AWAIT == "await"
+    assert extensible_strings_models.ExtensibleString.BREAK == "break"
+    assert extensible_strings_models.ExtensibleString.CLASS == "class"
+    assert extensible_strings_models.ExtensibleString.CONSTRUCTOR == "constructor"
+    assert extensible_strings_models.ExtensibleString.CONTINUE == "continue"
+    assert extensible_strings_models.ExtensibleString.DEF == "def"
+    assert extensible_strings_models.ExtensibleString.DEL == "del"
+    assert extensible_strings_models.ExtensibleString.ELIF == "elif"
+    assert extensible_strings_models.ExtensibleString.ELSE == "else"
+    assert extensible_strings_models.ExtensibleString.EXCEPT == "except"
+    assert extensible_strings_models.ExtensibleString.EXEC == "exec"
+    assert extensible_strings_models.ExtensibleString.FINALLY == "finally"
+    assert extensible_strings_models.ExtensibleString.FOR == "for"
+    assert extensible_strings_models.ExtensibleString.FROM == "from"
+    assert extensible_strings_models.ExtensibleString.GLOBAL == "global"
+    assert extensible_strings_models.ExtensibleString.IF == "if"
+    assert extensible_strings_models.ExtensibleString.IMPORT == "import"
+    assert extensible_strings_models.ExtensibleString.IN == "in"
+    assert extensible_strings_models.ExtensibleString.IS == "is"
+    assert extensible_strings_models.ExtensibleString.LAMBDA == "lambda"
+    assert extensible_strings_models.ExtensibleString.NOT == "not"
+    assert extensible_strings_models.ExtensibleString.OR == "or"
+    assert extensible_strings_models.ExtensibleString.PASS == "pass"
+    assert extensible_strings_models.ExtensibleString.RAISE == "raise"
+    assert extensible_strings_models.ExtensibleString.RETURN == "return"
+    assert extensible_strings_models.ExtensibleString.TRY == "try"
+    assert extensible_strings_models.ExtensibleString.WHILE == "while"
+    assert extensible_strings_models.ExtensibleString.WITH == "with"
+    assert extensible_strings_models.ExtensibleString.YIELD == "yield"

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",