[tests] test: speed up and expand GPU controller coverage

[Wangmerlyn]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @Wangmerlyn, 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 enhancing the robustness and efficiency of the GPU controller test suite. It achieves this by optimizing existing test execution times through reduced intervals and sleep durations, while simultaneously expanding test coverage to include critical throttling logic and adding more comprehensive assertions to validate the lifecycle of controller threads.

Highlights

• Test Speed Optimization: Reduced time.sleep durations and interval parameters in CudaGPUController and GlobalGPUController tests, significantly speeding up test execution from 10 seconds to fractions of a second.
• Expanded Test Coverage: Introduced a new test case (test_throttle.py) to verify the busy_threshold functionality of the CudaGPUController, ensuring it correctly throttles GPU activity when the device is already in use.
• Enhanced Test Assertions: Added explicit assertions to test_keep_and_release.py and global_keep_test.py to confirm that controller threads are properly started and stopped, improving test reliability and verifying thread lifecycle.

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[gemini-code-assist]

Code Review

This pull request significantly improves the test suite by speeding up existing tests and adding new coverage for the GPU controllers. The changes replace long time.sleep calls with shorter intervals and add assertions to verify the behavior of the controller threads. A new test is also added to ensure the controller respects the busy_threshold. My review includes a few suggestions to further improve test clarity and coverage by adding missing assertions and simplifying a confusing expression.

[gemini-code-assist]

This second keep()/release() cycle is missing assertions to verify the state of the worker thread. To make the test more robust and consistent with the other parts of this test function, you should add assertions to confirm the thread is alive after keep() and stopped after release().

    ctrl.keep()
    time.sleep(0.2)
    assert ctrl._thread and ctrl._thread.is_alive()
    ctrl.release()
    assert not (ctrl._thread and ctrl._thread.is_alive())