Add unittest for mirrored provider clients (AnthropicVertex)

[koxudaxi]

TL;DR

Added support for Anthropic models on Google Vertex AI.

What changed?

• Added "anthropic-vertex" provider with "claude-sonnet-4@20250514" model to the end-to-end test configuration
• Created new test files for the AnthropicVertex client:
  • Added basic module initialization file
  • Added test configuration with environment setup fixtures
  • Implemented comprehensive client tests covering context manager behavior, client caching, and environment variable fallbacks

How to test?

1. Run the existing test suite to verify the new AnthropicVertex client tests pass
2. Verify that the end-to-end tests work with the newly added "anthropic-vertex" provider
3. Test with different environment variable configurations to ensure proper fallback behavior

Why make this change?

This change expands Mirascope's LLM provider support to include Anthropic models available through Google Vertex AI, giving users more flexibility in choosing their preferred model deployment platform while maintaining a consistent interface.

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	v2-docs	2401400	Oct 29 2025, 02:38 PM

[koxudaxi]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add unittest for GrokClient #1467
• Implement the GrokClient #1466
• Support concurrent tool call streaming with ID-based tracking #1468
• Add unittest for mirrored provider clients (AnthropicVertex) #1465 👈 (View in Graphite)
• Implement mirrored provider clients (AnthropicVertex) #1464
• Add unittest for mirrored provider clients (AnthropicBedrock) #1455
• Implement mirrored provider clients (AnthropicBedrock) #1454
• Implement mirrored provider clients (AzureOpenAI) #1439
• Add public provider property to BaseClient #1441
• Clean up VCRConfig by replacing filter_headers with sanitization hook #1461
• v2

This stack of pull requests is managed by Graphite. Learn more about stacking.

[koxudaxi]

Quotation errors are occurring despite sufficient quota availability, preventing test execution. We have requested a quota limit increase for the relevant quotas, but it appears this will take approximately two business days to process.