FizzBuzz.java

package de.kopis.katas;

public class FizzBuzz {
     public String generate(int number) {
          String result = null;
          if(number == 0) {
               result = "0";
          } else if(number % 3 == 0 && number % 5 == 0) {
               result = "FizzBuzz";
          } else if(number % 3 == 0) {
               result = "Fizz";
          } else if(number % 5 == 0) {
               result = "Buzz";
          } else {
               result = String.valueOf(number);
          }
          if(result.contains("3")) {
               result = "Fizz";
          } else if(result.contains("5")) {
               result = "Buzz";
          }
          return result;
     }
}

FizzBuzzTest.java

package de.kopis.katas;

import static org.junit.Assert.*;

import mockit.integration.junit4.JMockit;

import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(JMockit.class)
public class FizzBuzzTest {
     @Test
     public void testValids() {
          int[] numbers = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 99, 180};
          String[] expected = new String[] {"0", "1", "2", "Fizz", "4", "Buzz", "Fizz", "7", "8", "Fizz", "Buzz", "11", "Fizz", "Fizz", "14", "FizzBuzz", "Fizz", "FizzBuzz"};

          FizzBuzz fb = new FizzBuzz();
          int index = 0;
          for (int number : numbers) {
               assertEquals(expected[index++], fb.generate(number));
          }
     }

     @Test
     public void testNewRequirements() {
          int[] numbers = {13, 43, 99, 25, 55, 185, 90};
          String[] expected = new String[] {"Fizz", "Fizz", "Fizz", "Buzz", "Buzz", "Buzz", "FizzBuzz"};

          FizzBuzz fb = new FizzBuzz();
          int index = 0;
          for (int number : numbers) {
               assertEquals(expected[index++], fb.generate(number));
          }
     }
}