add test for oauth providers

[codomposer]

Add Comprehensive Tests for OAuth Providers

Description

This PR adds comprehensive unit tests for all OAuth providers in the Chainlit authentication system. Previously, the oauth_providers.py module had no dedicated test coverage despite being critical for user authentication.

Test Coverage

Base Provider Tests

• Environment variable configuration detection
• Prompt parameter handling (provider-specific, global, and default)
• Abstract method implementation verification

Provider-Specific Tests

• Initialization and configuration
• Token retrieval and validation
• User info parsing
• Error handling (missing tokens, HTTP errors)
• Custom URL configuration
• Provider-specific features (refresh tokens, photo retrieval, etc.)

Edge Cases

• HTTP error handling
• Domain trailing slash normalization
• Prompt parameter injection
• Custom authorization server paths (Okta)
• Multi-tenant vs single-tenant configurations (Azure AD)
• Custom user identifier fields (Generic provider)

Testing Approach

• Uses pytest with async support (@pytest.mark.asyncio)
• Mocks HTTP requests with httpx.AsyncClient
• Uses patch.dict for environment variable isolation
• Module reloading for class-level attribute testing
• Follows existing test patterns from test_mcp.py and test_translations.py

Contribution by Gittensor, learn more at https://gittensor.io/

[cubic-dev-ai]

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