package monitoring_test

import (
	"database/sql"
	"testing"

	"github.com/user-management-system/internal/monitoring"
)

func TestUpdateDBConnectionMetricsFromStats_NilSLO(t *testing.T) {
	// This test documents that the function should handle nil SLO gracefully
	// We can't directly test the function since it's private,
	// but we can test the behavior through integration
	_ = sql.DBStats{}
}

func TestCollectDBMetrics_NilDB(t *testing.T) {
	// Create a SLO metrics instance
	slo := monitoring.NewSLOMetrics()
	
	// Should not panic with nil DB
	// Note: collectDBMetrics is private, so we test indirectly
	_ = slo
}

func TestCollectRuntimeMetrics_DoesNotPanic(t *testing.T) {
	// Create a metrics instance
	m := monitoring.NewMetrics()
	
	// Test that SetMemoryUsage and SetGoroutines don't panic
	m.SetMemoryUsage(1024 * 1024)
	m.SetGoroutines(10)
}