Improve test coverage

[ibrahimcesar]

Description

Help improve test coverage across the codebase.

Current Status

• 49 unit tests
• 11 property tests
• 10 integration tests
• 70 tests total

Areas Needing Coverage

Unit Tests

• Edge cases in event sanitization
• Error handling paths
• Configuration validation

Integration Tests

• Sync failure scenarios
• Offline mode transitions
• Concurrent access patterns

Property Tests

• Fuzz testing for parsers
• Randomized event generation
• Storage corruption recovery

How to Contribute

1. Run `cargo test` to see current tests
2. Run `cargo tarpaulin` for coverage report
3. Identify uncovered code paths
4. Write tests and submit PR

Good for learning the codebase!

Writing tests is a great way to understand how telemetry-kit works.