[python] Add body-or-no-content Spector coverage (#12153)

Add Python SDK coverage for operations whose successful response is
either a model body (HTTP 200) or no content (HTTP 204).

- **Coverage:** Shared sync and async tests for Azure and unbranded
clients assert `BlobLayout(content="hello")` for 200 and `None` for 204.
- **Response metadata:** Verify raw status codes and `x-ms-request-id`
headers for both responses.
- **Changelog:** Add an internal entry for the Python emitter.

<!-- START COPILOT CODING AGENT SUFFIX -->

- Fixes #12152

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>
Co-authored-by: Yuchao Yan <yuchaoyan@microsoft.com>

Author: Copilot

.chronus/changes/python-response-body-or-no-content-2026-10-12-3-14-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add sync and async Spector tests for responses with a model body or no content, including raw response status and headers.

cspell.yaml

@@ -40,6 +40,7 @@ words:
   - blib
   - blockful
   - blockless
+  - bodyornocontent
   - buongiorno
   - cadl
   - cadleditor

packages/http-client-python/tests/mock_api/shared/asynctests/test_response_body_or_no_content_async.py

@@ -0,0 +1,35 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import pytest
+import pytest_asyncio
+from response.bodyornocontent.aio import BodyOrNoContentClient
+from response.bodyornocontent.models import BlobLayout
+
+
+@pytest_asyncio.fixture
+async def client():
+    async with BodyOrNoContentClient(endpoint="http://localhost:3000") as client:
+        yield client
+
+
+@pytest.mark.asyncio
+async def test_get_body(client: BodyOrNoContentClient):
+    result = await client.get_body()
+    assert result == BlobLayout(content="hello")
+
+    response = await client.get_body(cls=lambda pipeline_response, _, __: pipeline_response.http_response)
+    assert response.status_code == 200
+    assert response.headers["x-ms-request-id"] == "body-request"
+
+
+@pytest.mark.asyncio
+async def test_get_no_content(client: BodyOrNoContentClient):
+    result = await client.get_no_content()
+    assert result is None
+
+    response = await client.get_no_content(cls=lambda pipeline_response, _, __: pipeline_response.http_response)
+    assert response.status_code == 204
+    assert response.headers["x-ms-request-id"] == "no-content-request"

packages/http-client-python/tests/mock_api/shared/test_response_body_or_no_content.py

@@ -0,0 +1,32 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import pytest
+from response.bodyornocontent import BodyOrNoContentClient
+from response.bodyornocontent.models import BlobLayout
+
+
+@pytest.fixture
+def client():
+    with BodyOrNoContentClient(endpoint="http://localhost:3000") as client:
+        yield client
+
+
+def test_get_body(client: BodyOrNoContentClient):
+    result = client.get_body()
+    assert result == BlobLayout(content="hello")
+
+    response = client.get_body(cls=lambda pipeline_response, _, __: pipeline_response.http_response)
+    assert response.status_code == 200
+    assert response.headers["x-ms-request-id"] == "body-request"
+
+
+def test_get_no_content(client: BodyOrNoContentClient):
+    result = client.get_no_content()
+    assert result is None
+
+    response = client.get_no_content(cls=lambda pipeline_response, _, __: pipeline_response.http_response)
+    assert response.status_code == 204
+    assert response.headers["x-ms-request-id"] == "no-content-request"