Add pytest test coverage for Python example applications

[Artemon-line]

🚀 The feature, motivation and pitch

Overview

Add automated pytest testing for all Python examples in examples/ to ensure code quality and prevent regressions.

Current State

• No existing tests or test infrastructure
• Multiple untested apps: agents, agent_store, client_tools, DocQA, interior_design_assistant

Proposed Structure

tests/
├── conftest.py
├── unit/
│ ├── agents/
│ ├── client_tools/
│ └── agent_store/
└── integration/

Dependencies to Add

pytest>=7.4.0
pytest-cov>=4.1.0
pytest-asyncio>=0.21.0
pytest-mock>=3.11.1

Implementation

• Mock external dependencies (Llama Stack server, API keys)
• Target 70% code coverage for critical paths
• Add pytest configuration (pytest.ini or pyproject.toml)
• Create shared fixtures in conftest.py

Success Criteria

• Test dependencies added to requirements
• Test suite covering all example apps
• All tests passing locally
• Coverage report generated
• Testing docs added to README

Alternatives

No response

Additional context

No response