{"Action":"run","Test":"TestIndexRandom"}
{"Action":"output","Test":"TestIndexRandom","Output":"=== RUN   TestIndexRandom\n"}
{"Action":"output","Test":"TestIndexRandom","Output":"--- PASS: TestIndexRandom (0.00s)\n"}
{"Action":"pass","Test":"TestIndexRandom"}
{"Action":"pass","Test":"TestIndexRandom"}
{"Action":"output","Test":"TestIndexRandom","Output":"=== PASS  TestIndexRandom\n"}
{"Action":"run","Test":"TestIndexRune"}

		}
	}
}

func simpleIndex(s, sep string) int {
	n := len(sep)
	for i := n; i <= len(s); i++ {
		if s[i-n:i] == sep {
			return i - n
		}
	}
	return -1
}

func TestIndexRandom(t *testing.T) {
	const chars = "abcdefghijklmnopqrstuvwxyz0123456789"
	for times := 0; times < 10; times++ {
		for strLen := 5 + rand.Intn(5); strLen < 140; strLen += 10 { // Arbitrary
			s1 := make([]byte, strLen)