var buf Buffer
	s := ""
	for i := 0; i < 50; i++ {
		wlen := rand.Intn(len(testString))
		if i%2 == 0 {
			s = fillString(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, testString[0:wlen])
		} else {
			s = fillBytes(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, testBytes[0:wlen])
		}

		rlen := rand.Intn(len(testString))
		fub := make([]byte, rlen)
		n, _ := buf.Read(fub)
		s = s[n:]
	}

// fetches a random number between range min-max.
func getRandomRange(min, max int, seed int64) int {
	// special value -1 means no explicit seeding.
	if seed != -1 {
		rand.Seed(seed)
	}
	return rand.Intn(max-min) + min
}

// Randomizes the order of bytes in the byte array
// using Knuth Fisher-Yates shuffle algorithm.
func randomizeBytes(s []byte, seed int64) []byte {

					logger.Info("IAM expired STS purge took %.2fs", took)
				}
			}

			// The following actions are performed about once in 4 times that
			// IAM is refreshed:
			if r.Intn(4) == 0 {
				// Poll and remove accounts for those users who were removed
				// from LDAP/OpenID.
				if sys.LDAPConfig.Enabled() {
					sys.purgeExpiredCredentialsForLDAP(ctx)