Ternary-JUnit

Ternary-JUnit
Program
package PRM_20180125;

public class Ternary {
    public static String fromDecadicToTernary(int a) {
        String vysledek = "";
        String konec = "";
        int pom = a;
        int cislo = 0;
        if(pom == 0) {
            return "0";
        } else {
            while(pom > 0) {
            cislo = pom % 3;
            vysledek += cislo;
            pom = pom / 3;
        }
            return new StringBuilder(vysledek).reverse().toString();
        }

    }

    public static int fromTernaryToDecadic(String a) {
        String pom = a;
        int vysledek = 0;
        double cislo = 0;
        for (int i = 0; i < pom.length(); i++) {
            //cislo = Integer.parseInt(String.valueOf(pom.charAt(i)));
            cislo = Character.getNumericValue(pom.charAt(i));
            int moc = pom.length()-1-i;
            vysledek += cislo * Math.pow(3, moc);
        }
        return vysledek;
    }

    public static void main(String[] args) {
        int a = 3;
        String aa = "101";
        System.out.println(fromDecadicToTernary(a));
        System.out.println(fromTernaryToDecadic(aa));
        //System.out.println(Math.pow(3, 0));
    }
}
Test
package PRM_20180125;

import org.junit.Test;
import static org.junit.Assert.*;

public class TernaryTest {

    private final int expectedDekadic[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 99, 100, 666, 1000, 1000000};
    private final String expectedTernary[] = {"0", "1", "2", "10", "11", "12", "20", "21", "22", "100", "101", "120", "1010", "10200", "10201", "220200", "1101001", "1212210202001"};

    @Test
    public void testFromDecadicToTernary() {
        for (int i = 0; i < expectedDekadic.length; i++) {
            assertEquals(expectedTernary[i], Ternary.fromDecadicToTernary(expectedDekadic[i]));
        }
    }

    @Test
    public void testFromTernaryToDecadic() {
        for (int i = 0; i < expectedDekadic.length; i++) {
            assertEquals(expectedDekadic[i], Ternary.fromTernaryToDecadic(expectedTernary[i]));
        }
    }

}