Add comprehensive unit test coverage (29.19%)
Add 73 unit tests covering all testable business logic:
- src/snmp/types.rs: 100% coverage (17/17 lines)
* SnmpError display formatting
* SnmpValue conversions (as_i64, as_f64)
- src/snmp/client.rs: 34.4% coverage (32/93 lines)
* OID parsing/formatting/validation
* SNMP value conversion for all types
* Error mapping from snmp crate
* Helper functions (starts_with, format_oid)
- src/ping.rs: 65.2% coverage (58/89 lines)
* ICMP checksum calculation and verification
* Echo request packet building
* Reply packet parsing (raw and IP-wrapped)
* IP header length extraction (IHL field)
* Error handling for invalid packets
- src/version.rs: 54.0% coverage (27/50 lines)
* Version parsing with optional 'v' prefix
* Version comparison and sorting
* Docker Hub response deserialization
* Latest version extraction from tags
- src/websocket_client.rs: 7.7% coverage (17/221 lines)
* SnmpValue to string conversion
* Agent ID generation
* Phoenix message serialization/deserialization
* Helper functions (get_uptime_seconds, get_local_ip)
- src/main.rs: 20.0% coverage (11/55 lines)
* SimpleLogger enabled() logic
* HTTP/HTTPS to WebSocket URL conversion
- .gitlab-ci.yml: Add 'cargo test' to CI pipeline
Uncovered code requires integration testing:
- Network I/O (WebSocket, HTTP, Docker Hub API)
- System privileges (raw ICMP sockets)
- External services (SNMP devices, WebSocket servers)
- Runtime initialization (tokio main, logger setup)
All 73 tests pass. No test failures.
Graham McIntire
0b3cc9121e