test: add network mocking for example tests

[ryoppippi]

Summary

• Replaced test skipping with proper network mocking using the responses library
• Tests now mock StackOne API endpoints instead of making real API calls
• Examples are imported and executed directly to enable mocking within the test process

Changes

• Added responses library as a dev dependency for HTTP request mocking
• Modified test execution from subprocess to direct module import (required for mocking to work)
• Mock API responses for index.py and file_uploads.py examples
• Only skip tests when optional dependencies (openai, langchain_openai, crewai) are not installed

Test Results

All tests pass successfully with mocking enabled:

• 38 tests pass
• 3 tests skipped (due to missing optional dependencies)
• No real API calls are made during testing

Benefits

• Tests are more reliable and do not depend on external API availability
• Faster test execution
• No need for valid API keys or account IDs in CI/CD
• Better test coverage of example files

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Summary by cubic

Tests for example files now use network mocking with the responses library, so no real API calls are made and tests run faster and more reliably.

• Testing Improvements
• Mocked StackOne API endpoints for index.py and file_uploads.py examples.
• Tests import and run example modules directly to enable mocking.
• Only skip tests if optional dependencies are missing.

[cubic-dev-ai]

cubic analysis

No issues found across 7 files. Review in cubic