FizzBuzz lab.

src/main/java/FizzBuzz.java

@@ -1,2 +1,28 @@
 public class FizzBuzz {
+    public String divideBy3(int n) {
+
+        if ( n % 3 == 0){
+
+            return "Fizz";
+
+        }return null;
+    }
+
+    public String divideBy5(int n) {
+        if ( n % 5 == 0){
+
+            return "Buzz";
+
+        }return null;
+    }
+
+    public String divideBy15(int n) {
+        if (n % 15 == 0) {
+
+            return "FizzBuzz";
+
+        }
+        return null;
+
+    }
 }

src/test/java/FizzBuzzTest.java

@@ -1,2 +1,44 @@
+import org.junit.Assert;
+import org.junit.Test;
+
 public class FizzBuzzTest {
+
+    @Test
+    public void test1(){
+        //Given
+        FizzBuzz Fizz = new FizzBuzz();
+
+        int n = 12;
+
+        String expected = "Fizz";
+        //When
+        String acutal = Fizz.divideBy3(n);
+        Assert.assertEquals(expected,acutal);
+    }
+
+    @Test
+    public void test2(){
+        //Given
+        FizzBuzz Fizz = new FizzBuzz();
+
+        int n = 10;
+
+        String expected = "Buzz";
+        //When
+        String acutal = Fizz.divideBy5(n);
+        Assert.assertEquals(expected,acutal);
+    }
+
+    @Test
+    public void test3() {
+        //Given
+        FizzBuzz Fizz = new FizzBuzz();
+
+        int n = 15;
+
+        String expected = "FizzBuzz";
+        //When
+        String acutal = Fizz.divideBy15(n);
+        Assert.assertEquals(expected, acutal);
+    }
 }