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536e5682d6
test: add comprehensive delivery engine and circuit breaker tests
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Add unit tests for internal/delivery/ package covering:
Circuit breaker tests (circuit_breaker_test.go):
- Closed state allows deliveries
- Failure counting below threshold
- Open transition after threshold failures
- Cooldown blocks during cooldown period
- Half-open transition after cooldown expires
- Probe success closes circuit
- Probe failure reopens circuit
- Success resets failure counter
- Concurrent access safety (race-safe)
- CooldownRemaining for all states
- CircuitState String() output
Engine tests (engine_test.go):
- Non-blocking Notify when channel is full
- HTTP target success and failure delivery
- Database target immediate success
- Log target immediate success
- Retry target success with circuit breaker
- Max retries exhausted marks delivery failed
- Retry scheduling on failure
- Exponential backoff duration verification
- Backoff cap at shift 30
- Body pointer semantics (inline <16KB, nil >=16KB)
- Worker pool bounded concurrency
- Circuit breaker blocks delivery attempts
- Circuit breaker per-target creation
- HTTP config parsing (valid, empty, missing URL)
- scheduleRetry sends to retry channel
- scheduleRetry drops when channel full
- Header forwarding (forwardable vs hop-by-hop)
- processDelivery routing to correct handler
- Truncate helper function
All tests use real SQLite databases and httptest servers.
All tests pass with -race flag.
2026-03-01 23:16:30 -08:00
