Add comprehensive unit test suite (100 tests, 54% coverage)

[daedalist]

Summary

Implements a complete unit testing infrastructure for SunGather with 100 tests achieving 54% overall code coverage
across export modules and core functionality.

Testing Infrastructure

• pytest: Test framework with fixtures and parameterization
• pytest-mock: Mocking library for isolating components
• pytest-cov: Coverage reporting (HTML and terminal output)
• pytest.ini: Configuration for test discovery and coverage settings

GitHub Workflow

• .github/workflows/test.yml: CI pipeline running on push/PR
• Tests run on Python 3.9, 3.10, 3.11, and 3.12
• Automatic coverage reporting in PR comments
• Prevents merging if tests fail

Test Coverage by Module

Module	Coverage	Tests
console.py	100%	11
webserver.py	99%	20
influxdb.py	98%	19
mqtt.py	93%	24
pvoutput.py	84%	21
hassio.py	6%	1 (documents broken state)
sungather.py	0%	4 (AST-based tests)

Overall: 54% coverage, 100 tests

Test Organization

• tests/exports/: Export module tests (console, webserver, mqtt, influxdb, pvoutput, hassio)
• tests/test_sungather.py: Main module tests using AST parsing
• tests/conftest.py: Shared fixtures and test configuration
• tests/README.md: Documentation for running and writing tests

Notable Test Patterns

• Mock-based testing for external dependencies (MQTT, InfluxDB, HTTP servers)
• AST parsing for testing sungather.py (module has sys.exit() at top level)
• Exception-based testing for hassio.py (documents known bug)
• Coverage of both success and error paths

Known Issues Documented

• hassio.py has a bug: line 12 defines api_base, but lines 13-16 use undefined url_base
• Test expects AttributeError and will fail when bug is fixed as a reminder to add proper functional tests

Development Workflow

# Install dev dependencies
pip install -r requirements-dev.txt

# Run tests
pytest

# Run with coverage
pytest --cov=SunGather --cov-report=html

# View coverage report
open htmlcov/index.html

Files Changed

- .github/workflows/test.yml - CI/CD test pipeline
- pytest.ini - pytest configuration
- requirements-dev.txt - development dependencies
- tests/README.md - testing documentation
- tests/conftest.py - shared test fixtures
- tests/test_sungather.py - main module tests
- tests/exports/test_*.py - export module tests (6 files)

Benefits

- ✅ Automated testing on every push/PR
- ✅ Prevents regressions in export modules
- ✅ Documents expected behavior
- ✅ Makes refactoring safer
- ✅ Improves code quality and maintainability

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🤖 Coded with https://claude.com/claude-code assistance

[codecov-commenter]

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