# kata

## [FizzBuzz](https://kata-log.rocks/fizz-buzz-kata)

import static org.assertj.core.api.Assertions.assertThat;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.IntStream;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;

class FizzBuzzKataTest {

  public static final int START = 1;
  public static final int END = 10;
  public static final String FIZZ_BUZZ = "FizzBuzz";
  public static final String FIZZ = "Fizz";
  public static final String BUZZ = "Buzz";

  /*
   * 한 줄에 1~100까지 출력
   * 3의 배수 "Fizz"
   * 5의 배수 "Buzz"
   * 3과 5의 공배수 "FizzBuzz"
   * */
  @Nested
  class fizzBuzzTest {

    int[] numbers;
    Map<Integer, String> result;

    @BeforeEach
    void setUp() {
      numbers = IntStream.rangeClosed(START, END).toArray();
      result = new HashMap<>();
      Arrays.stream(numbers).forEachOrdered(number -> result.put(number, calculateFizzBuzz(number)));
    }

    @DisplayName("값을 검증한다")
    @Test
    void assert_value() {
      result.forEach((key, value) -> {
        if (key % 3 == 0 && key % 5 == 0) {
          assertThat(value).isEqualTo("FizzBuzz");
        } else if (key % 3 == 0) {
          assertThat(value).isEqualTo("Fizz");
        } else if (key % 5 == 0) {
          assertThat(value).isEqualTo("Buzz");
        } else {
          assertThat(value).isEqualTo(String.valueOf(key));
        }
      });
    }
  }

  @DisplayName("값을 프린트한다")
  @Test
  void print_value() {
    String value = IntStream.rangeClosed(START, END)
        .mapToObj(this::calculateFizzBuzz)
        .reduce((a, b) -> a + " " + b)
        .orElse("");
    System.out.print(value);
  }

  private String calculateFizzBuzz(int number) {
   if (number % 3 == 0 && number % 5 == 0) {
      return FIZZ_BUZZ;
    } else if (number % 3 == 0) {
      return FIZZ;
    } else if (number % 5 == 0) {
      return BUZZ;
    } else {
      return String.valueOf(number);
    }
  }
}