Increase test coverage to 98%: add comprehensive unit tests for client/device, retries, and export paths

[devinslick]

Increase test coverage to 98%: add comprehensive unit tests for client/device, retries, and export paths

Summary

• Raises repository test coverage from ~81% to 98%
• Adds 45+ targeted unit tests across fmd_api.client and fmd_api.device
• Focuses on previously untested error paths, retry/backoff logic, and export edge cases
• No production code changes; tests only

What changed

• New tests in tests/unit/test_coverage_improvements.py:
  • Authentication flow: salt retrieval, password hashing, access token, private key decryption
  • Retry/backoff: 429 with Retry-After, 500/502/503/504, connection errors, jitter/no-jitter backoff
  • JSON parsing fallbacks: non-JSON responses, empty body, missing keys
  • Export ZIP: PNG/JPEG detection, default jpg fallback for unknown formats, decrypt errors
  • Device edge cases: photo download decode errors, internal guards
  • Utilities: token masking, Retry-After parsing, streaming responses
• Coverage artifacts: coverage.xml generated for Codecov

Why

• Address Codecov alerts and improve confidence in critical paths (auth, I/O, error handling)
• Reduce regressions by covering negative and edge scenarios

Metrics

• Before: ~81% total coverage (client.py ~77%, device.py ~94%)
• After: 98% total coverage (client.py ~97%, device.py 100%)
• Tests: 104 tests passing locally

Compatibility

• Breaking changes: None
• Public API changes: None
• Dependencies: No new runtime dependencies

How to validate locally (optional)

# From repo root (Windows PowerShell)
python -m pytest tests/unit --cov=fmd_api --cov-report=term-missing --cov-branch

Notes and follow-ups

• Remaining uncovered lines are hard-to-trigger branches in client.py (e.g., specific fallback/log-only segments): 353–358, 368, 392–393, 477–478, 563, 717–718
• Reaching 100% would likely require deeper aiohttp response mocking or small refactors to expose those branches for deterministic testing; can be tackled in a follow-up if desired

Checklist

• All unit tests pass locally
• Coverage ≥ 95% (actual: 98%)
• No production code changes
• coverage.xml updated for CI/Codecov

[Copilot]

Pull Request Overview

This PR updates the version number of the fmd_api package from 2.0.1 to 2.0.2, indicating a patch release.

• Version bump from 2.0.1 to 2.0.2 in the project metadata

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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