test: design unit test for part one

cmd/aoc/main.go

@@ -33,6 +33,9 @@ import (
 	_ "advent-of-code/internal/2021/DayThree"
 	_ "advent-of-code/internal/2021/DayTwo"
 	_ "advent-of-code/internal/2022/DayOne"
+
+	// 2025
+	_ "advent-of-code/internal/2025/DayOne"
 )
 
 func capitalize(day string) string {

internal/2025/DayOne/code_test.go

@@ -0,0 +1,24 @@
+package dayone
+
+import "testing"
+
+var testInput = []string{
+	"L68",
+	"L30",
+	"R48",
+	"L5",
+	"R60",
+	"L55",
+	"L1",
+	"L99",
+	"R14",
+	"L82",
+}
+
+func TestPartOne(t *testing.T) {
+	expected := 3
+	got := PartOne(testInput)
+	if got != expected {
+		t.Errorf("PartOne() = %d, want %d", got, expected)
+	}
+}