feat(go): add benchmark tests for bubble sort

codes/go/chapter_sorting/bubble_sort_bench_test.go

@@ -0,0 +1,54 @@
+// File: bubble_sort_bench_test.go
+// Created Time: 2026-02-06
+// Author: Contributor (contributor@example.com)
+
+package chapter_sorting
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+	"time"
+)
+
+func BenchmarkBubbleSort(b *testing.B) {
+	sizes := []int{100, 500, 1000}
+	for _, size := range sizes {
+		b.Run(fmt.Sprintf("size-%d", size), func(b *testing.B) {
+			b.StopTimer()
+			nums := make([]int, size)
+			rand.Seed(time.Now().UnixNano())
+
+			b.StartTimer()
+			for i := 0; i < b.N; i++ {
+				b.StopTimer()
+				for j := 0; j < size; j++ {
+					nums[j] = rand.Intn(size)
+				}
+				b.StartTimer()
+				bubbleSort(nums)
+			}
+		})
+	}
+}
+
+func BenchmarkBubbleSortWithFlag(b *testing.B) {
+	sizes := []int{100, 500, 1000}
+	for _, size := range sizes {
+		b.Run(fmt.Sprintf("size-%d", size), func(b *testing.B) {
+			b.StopTimer()
+			nums := make([]int, size)
+			rand.Seed(time.Now().UnixNano())
+
+			b.StartTimer()
+			for i := 0; i < b.N; i++ {
+				b.StopTimer()
+				for j := 0; j < size; j++ {
+					nums[j] = rand.Intn(size)
+				}
+				b.StartTimer()
+				bubbleSortWithFlag(nums)
+			}
+		})
+	}
+}