feat: solve day 8 part 1...twice

cmd/08/connection/connection.go

@@ -0,0 +1,36 @@
+// Package connection provides a model and methods for connections between junction boxes.
+package connection
+
+import "github.com/StevanFreeborn/advent-of-code-2025/cmd/08/box"
+
+type Connection interface {
+	Start() box.Box
+	End() box.Box
+	Distance() float64
+}
+
+type connection struct {
+	start    box.Box
+	end      box.Box
+	distance float64
+}
+
+func (c connection) Start() box.Box {
+	return c.start
+}
+
+func (c connection) End() box.Box {
+	return c.end
+}
+
+func (c connection) Distance() float64 {
+	return c.distance
+}
+
+func From(start box.Box, end box.Box) Connection {
+	return connection{
+		start:    start,
+		end:      end,
+		distance: start.DistanceFrom(end),
+	}
+}

cmd/08/connection/connection_test.go

@@ -0,0 +1,28 @@
+package connection_test
+
+import (
+	"testing"
+
+	"github.com/StevanFreeborn/advent-of-code-2025/cmd/08/box"
+	"github.com/StevanFreeborn/advent-of-code-2025/cmd/08/connection"
+)
+
+func TestFrom(t *testing.T) {
+	start := box.From("1,2,3")
+	end := box.From("4,5,6")
+	expectedDistance := start.DistanceFrom(end)
+
+	conn := connection.From(start, end)
+
+	if conn.Start() != start {
+		t.Errorf("Connection Start() = %v; want %v", conn.Start(), start)
+	}
+
+	if conn.End() != end {
+		t.Errorf("Connection End() = %v; want %v", conn.End(), end)
+	}
+
+	if conn.Distance() != expectedDistance {
+		t.Errorf("Connection Distance() = %v; want %v", conn.Distance(), expectedDistance)
+	}
+}