fix(test): add environment cleanup for Vertex AI Qwen tests

[jquinter]

Summary

Fixes test isolation issue in Vertex AI Qwen tests by adding environment variable cleanup.

Problem

Test test_vertex_ai_qwen_global_endpoint_url was failing in CI with:

litellm.exceptions.AuthenticationError: Vertex_aiException - {
  "error": {
    "code": 401,
    "message": "Request had invalid authentication credentials..."
  }
}

Previous tests set Google/Vertex AI environment variables and don't clean them up, causing this test to attempt real Google authentication instead of using mocks.

Solution

Added clean_vertex_env pytest fixture with autouse=True to:

1. Save and clear all Google/Vertex AI environment variables before each test
2. Restore them after each test completes

Same fix pattern as:

• PR fix(test): add environment cleanup for Vertex AI rerank tests #21268 (Vertex AI rerank tests)
• PR fix(test): add environment cleanup for Vertex AI GPT-OSS tests #21272 (Vertex AI GPT-OSS tests)

Testing

Prevents real API calls by ensuring clean environment for all tests in this file.

Related

This test failure was reported on PR #21217, but NOT caused by PR #21217 (which only modifies Anthropic structured output tests). This is part of a broader test isolation issue affecting multiple Vertex AI test files.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview, Comment	Feb 15, 2026 10:21pm

[greptile-apps]

Greptile Summary

This PR adds a clean_vertex_env pytest fixture with autouse=True to the Vertex AI Qwen global endpoint test file. The fixture saves and clears 6 Google/Vertex AI environment variables (GOOGLE_APPLICATION_CREDENTIALS, GOOGLE_CLOUD_PROJECT, VERTEXAI_PROJECT, VERTEX_PROJECT, VERTEX_LOCATION, VERTEX_AI_PROJECT) before each test, and restores them afterward.

• Fixes a test isolation issue where previous tests would set Google/Vertex AI env vars, causing test_vertex_ai_qwen_global_endpoint_url to attempt real authentication instead of using mocks
• Uses the same pattern as PRs fix(test): add environment cleanup for Vertex AI rerank tests #21268 (rerank) and fix(test): add environment cleanup for Vertex AI GPT-OSS tests #21272 (GPT-OSS)
• All tests in the file remain mock-only with no real network calls

Confidence Score: 5/5

• This PR is safe to merge — it only adds test infrastructure (environment cleanup fixture) with no production code changes.
• The change is minimal and well-scoped: a single pytest fixture added to a test file. It follows an established pattern from sibling PRs, correctly saves/restores environment state, and introduces no risk to production code.
• No files require special attention.

Important Files Changed

Filename	Overview
tests/test_litellm/llms/vertex_ai/vertex_ai_partner_models/qwen/test_vertex_ai_qwen_global_endpoint.py	Adds autouse pytest fixture to clean Google/Vertex AI environment variables before each test and restore them after. Standard test isolation pattern consistent with sibling PRs.

Sequence Diagram

sequenceDiagram
    participant Pytest as Pytest Runner
    participant Fixture as clean_vertex_env Fixture
    participant Env as os.environ
    participant Test as Test Function

    Pytest->>Fixture: Before each test (autouse)
    Fixture->>Env: Save & clear GOOGLE_APPLICATION_CREDENTIALS
    Fixture->>Env: Save & clear GOOGLE_CLOUD_PROJECT
    Fixture->>Env: Save & clear VERTEXAI_PROJECT
    Fixture->>Env: Save & clear VERTEX_PROJECT
    Fixture->>Env: Save & clear VERTEX_LOCATION
    Fixture->>Env: Save & clear VERTEX_AI_PROJECT
    Fixture-->>Pytest: yield (env is clean)
    Pytest->>Test: Run test with clean environment
    Test-->>Pytest: Test completes
    Pytest->>Fixture: After test (teardown)
    Fixture->>Env: Restore saved variables
    Fixture-->>Pytest: Cleanup done

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