Thank you. I've got it.

Just ONE_HUNDRED being uppercase should be final.

What would happen if "int n == -15", for example?.. Where is the checking for positive/negative int?

In such a release when (nb_petals == 516) the result is "I love you" while it should be "not at all"...

If you please, can someone explain me in detail why all the tests are passed, but random tests - are not. It's not the only kata when it happens and I don't know how to check it without clean understanding the characters of the tests that I don't see. Please.
import java.util.ArrayList;
import java.util.Arrays;

public class Kata {
public static int[] mergeArrays(int[] first, int[] second) {
ArrayList list = new ArrayList();
for(int i = 0; i < first.length; i++) {
list.add(first[i]);
}
for(int i = 0; i < second.length; i++) {
list.add(second[i]);
}
for(int i = 0; i < list.size()-1; i++) {
for(int j = list.size()-1; j > i+1; j--) {
if(list.get(j) == list.get(i)) list.remove(j);
}
}
int[] result = new int[list.size()];
for(int i = 0; i < result.length; i++) {
result[i] = (int) list.get(i);
}
Arrays.sort(result);
return result;
}
}

Yes, you're right. Thank you so much! I've corrected them.

OK, I know it but I am somewhat puzzled anyway. I'll think it over again. Thank you so much!