[WIP] Add test case for PR #11239 in Typespec

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>[python] add test case for #11239</issue_title>
<issue_description>follow skill https://github.com/microsoft/typespec/blob/main/.github/skills/python-sdk-spector-mock-api-tests/SKILL.md to write test case for #11239</issue_description>

• Closes [python] add test case for https://github.com/microsoft/typespec/pull/11239 #11403

Comments on the Issue (you are @copilot in this section)

• Fixes [python] add test case for https://github.com/microsoft/typespec/pull/11239 #11403

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