/**
* Creates values that are different from expected, replacing chars with invalid ones using some
* heuristics and random probability. Relates to generated charactgers, length is controlled with
* the "invalid" variable.
*
* @return the next generated value.
*/
public String randomInvalid() {
if (rand == null)
throw new IllegalStateException("You need to set seed before using data objects");
int length = length();
char[] c = new char[length];
for (int i = 0; i < length; i++) {
float f = rand.nextFloat(0, 1);
if (f > invalidProbability) {
c[i] = chars.random();
} else {
c[i] = chars.invalidRandom();
}
}
String next = new String(c);
history.add(next);
record(next);
return next;
}
