Add fizzbuzz class with test

src/main/java/com/ordestiny/tdd/fizzbuzz/FizzBuzz.java

@@ -0,0 +1,26 @@
+package com.ordestiny.tdd.fizzbuzz;
+
+public class FizzBuzz {
+
+  public void printFizzBuzz(int numberIteration) {
+    for (int i = 1; i <= numberIteration; i++) {
+      System.out.println(fizzBuzz(i));
+    }
+  }
+
+  public String fizzBuzz(int i) {
+    boolean isFizz = i % 3 == 0;
+    boolean isBuzz = i % 5 == 0;
+    boolean isFizzBuzz = isFizz && isBuzz;
+
+    if (isFizzBuzz) {
+      return "FizzBuzz";
+    } else if (isFizz) {
+      return "Fizz";
+    } else if (isBuzz) {
+      return "Buzz";
+    } else {
+      return String.valueOf(i);
+    }
+  }
+}

src/test/java/com/ordestiny/tdd/fizzbuzz/FizzBuzzTest.java

@@ -0,0 +1,30 @@
+package com.ordestiny.tdd.fizzbuzz;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class FizzBuzzTest {
+
+  FizzBuzz fizzBuzz = new FizzBuzz();
+
+  @Test
+  public void printFizzBuzz_given15Iterations_fizzBuzzIsCorrectlyPrinted() {
+    fizzBuzz.printFizzBuzz(100);
+  }
+
+  @Test
+  public void fizzBuzz_givenMultipleOfThree_fizzReturned() {
+    assertEquals("Fizz", fizzBuzz.fizzBuzz(3));
+  }
+
+  @Test
+  public void fizzBuzz_givenMultipleOfFive_buzzReturned() {
+    assertEquals("Buzz", fizzBuzz.fizzBuzz(5));
+  }
+
+  @Test
+  public void fizzBuzz_givenMultipleOfThreeAndFive_fizzBuzzReturned() {
+    assertEquals("FizzBuzz", fizzBuzz.fizzBuzz(15));
+  }
+}