[Test] Fix UT for EPLBController

[Spicy-Stick]

What this PR does / why we need it?

This PR updates the unit tests for AscendEPLBController to align with the new prepare_forward interface instead of the deprecated step method. This ensures that the unit tests correctly verify the load collection phase filtering and step recording behavior.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

The patch itself consists of unit test updates. The updated unit tests in tests/ut/worker/v2/test_eplb_controller.py were executed and passed.

• vLLM main: vllm-project/vllm@ba07e4a

[gemini-code-assist]

Summary of Changes

Hello, 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 updates the unit tests for the EPLBController to reflect recent changes in the controller's internal API. The tests now correctly validate the behavior of the prepare_forward method, ensuring that state recording and phase handling are functioning as expected under various conditions.

Highlights

• Unit Test Refactoring: Updated unit tests for EPLBController to align with the new prepare_forward method signature and logic.
• Test Coverage: Replaced legacy step-based tests with specific test cases for prepare_forward, covering matching phases, non-matching phases, and closed window scenarios.

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[github-actions]

👋 Hi! Thank you for contributing to the vLLM Ascend project. The following points will speed up your PR merge:‌‌

• A PR should do only one thing, smaller PRs enable faster reviews.
• Every PR should include unit tests and end-to-end tests ‌to ensure it works and is not broken by other future PRs.
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[gemini-code-assist]

Code Review

This pull request updates the unit tests in tests/ut/worker/v2/test_eplb_controller.py to test the new prepare_forward interface instead of the deprecated step method. The reviewer feedback suggests updating the PR title and summary to comply with the repository's style guide format.

[gemini-code-assist]

According to the repository style guide, the PR title and summary should follow a specific format. Here are the suggested PR title and summary based on the style guide:

Suggested PR Title:

[Test][BugFix] Fix UT for EPLBController

Suggested PR Summary:

### What this PR does / why we need it?

This PR updates the unit tests for `AscendEPLBController` to align with the new `prepare_forward` interface instead of the deprecated `step` method. This ensures that the unit tests correctly verify the load collection phase filtering and step recording behavior.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

The patch itself consists of unit test updates. The updated unit tests in `tests/ut/worker/v2/test_eplb_controller.py` were executed and passed.

References

1. The PR title and summary should follow the specified format in the repository style guide, including the [Branch][Module][Action] prefix for the title and the standard sections for the summary. ^(link)

[AuroraEmiya]

#15278