1package example
 2
 3import "testing"
 4
 5// Given a string, find the length of the longest substring without repeating characters.
 6
 7func lengthOfLongestSubstring(s string) int {
 8	max, count, runes := 0, 0, []rune(s)
 9
10	for i, item := range runes {
11		if i == 0 || item == runes[i-1] {
12			count = 0
13		}
14
15		count += 1
16		if count > max {
17			max = count
18		}
19	}
20
21	return max
22}
23
24func TestLongestSubstring(t *testing.T) {
25	t.Run("abrkaabcdefghijjxxx returns 10", func(t *testing.T) {
26		result := lengthOfLongestSubstring("abrkaabcdefghijjxxx")
27		if result != 10 {
28			t.Errorf("Expected: 10, Got: %v", result)
29		}
30	})
31}