test: avoid local env impacting unit test

[fangyh20]

avoid loading the .env file to impact this unit test

unit tests don't need values from env vars. env vars are for integration test only.
but accidently loading env vars impacted running this unit test

[gemini-code-assist]

Summary of Changes

Hello @fangyh20, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the robustness of unit tests by isolating them from local environment configurations. The change ensures that tests execute in a controlled environment, preventing potential issues caused by environment variables loaded from .env files, thereby leading to more consistent and reliable test results across different development setups.

Highlights

• Unit Test Isolation: Introduced a mechanism to prevent local environment variables from influencing unit test execution, specifically by clearing os.environ for a particular test.
• Test Reliability: Enhanced the reliability of unit tests by ensuring they run in a clean, predictable environment, free from external .env` file interference.

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[gemini-code-assist]

Code Review

This pull request improves the reliability of a unit test by isolating it from local environment variables. Adding @mock.patch.dict(os.environ, {}, clear=True) to test_create_session_with_client_environment_label makes the test hermetic, preventing potential failures due to environment configurations on a developer's machine. This is an excellent change that follows best practices for testing.