add FizzBuzz By AgileSamuraiBaseCamp

src/Chapter1/FizzBuzz.java

@@ -0,0 +1,23 @@
+package Chapter1;
+
+public class FizzBuzz {
+    public String convert(int src) {
+
+        if(multiply(src, 3 * 5)) {
+            return "FizzBuzz";
+        }
+        if(multiply(src, 3)){
+            return "Fizz";
+        }
+        if(multiply(src, 5)) {
+            return "Buzz";
+        }
+
+        return String.valueOf(src);
+    }
+
+    private boolean multiply(int src, int base) {
+        return src % base == 0;
+    }
+
+}

test/Chapter1/FizzBuzzTest.java

@@ -0,0 +1,47 @@
+package Chapter1;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+public class FizzBuzzTest {
+    FizzBuzz sut;
+
+    @Before
+    public void setup() {
+        sut = new FizzBuzz();
+    }
+
+    @Test
+    public void _1を入力したら1を返すべき() {
+        assertThat(sut.convert(1), is("1"));
+    }
+
+    @Test
+    public void _2を入力したら2を返すべき() {
+        assertThat(sut.convert(2) , is("2"));
+    }
+
+    @Test
+    public void _3を入力したらFizzを返すべき() {
+        assertThat(sut.convert(3), is("Fizz"));
+    }
+
+    @Test
+    public void _6を入力したらFizzを返すべき() {
+        assertThat(sut.convert(6), is("Fizz"));
+    }
+
+    @Test
+    public void _5を入力したらBuzzを返すべき() {
+        assertThat(sut.convert(5), is("Buzz"));
+    }
+
+    @Test
+    public void _15を入力したらFizzBuzzを返すべき() {
+        assertThat(sut.convert(15), is("FizzBuzz"));
+    }
+
+}