[Test] Add ACL graph capture/replay DP test

[yiz-liu]

What this PR does / why we need it?

Add ACL graph capture/replay DP test, this is a imprved version of #3886

Restructures the multi-card ACL graph test for improved clarity, robustness, and accuracy.

Key improvements include:

• Replaces fragile sys.settrace and manual patching with a clean, reusable spy installer using unittest.mock.patch.
• Introduces more precise metrics by tracking NPUModelRunner.execute_model and _dummy_run calls directly.
• Rewrites assertions to be more accurate and provides clear explanations for the expected counts of graph captures, replays, model executions, and dummy runs.
• Simplifies the overall test structure by separating the worker logic into a dedicated function.
• Removes a long, unnecessary sleep at the end of the test.
• Expands test coverage by adding a larger max_tokens parameter.

Does this PR introduce any user-facing change?

None.

How was this patch tested?

None.

• vLLM version: v0.11.0
• vLLM main: vllm-project/vllm@2918c1b

[github-actions]

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[gemini-code-assist]

Code Review

This pull request introduces a new end-to-end test for ACL graph capture and replay with data parallelism. The changes are a significant improvement, using unittest.mock.patch for cleaner method spying and providing detailed, well-commented assertions for various metrics. The test structure is clear and robust.

My review focuses on ensuring test reliability. I've identified one area for improvement: the use of a hardcoded network port, which could lead to flaky tests in a parallel execution environment. I've suggested using a dynamic port to address this.

[Copilot]

Pull Request Overview

This PR adds a comprehensive end-to-end test for ACL graph capture and replay functionality in data parallel (DP) mode. This is an improved version of PR #3886 that uses a cleaner testing approach with mock-based spies instead of fragile sys.settrace mechanisms.

Key improvements:

• Implements thread-safe spy installation using unittest.mock.patch to track NPU method invocations
• Adds precise metrics tracking for graph captures, replays, model executions, and dummy runs
• Expands test coverage with multiple max_tokens values (4 and 36) to test different execution paths

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
tests/e2e/multicard/test_aclgraph_capture_replay.py	New test file that validates ACL graph capture/replay behavior in DP mode with comprehensive metrics tracking and assertions
.github/workflows/_e2e_test.yaml	Adds the new test to the full e2e test suite execution

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[whx-sjtu]

In the future we should break down the template script for launching DP into more granular functions, and then all DP-related UTs can import these functions to reuse code. Specially we should enable the 'main' function to support passing extra parameters and additional patch functions.