diff --git a/src/main/java/utils/Dog.java b/src/main/java/utils/Dog.java
new file mode 100644
index 0000000..2f5630f
--- /dev/null
+++ b/src/main/java/utils/Dog.java
@@ -0,0 +1,8 @@
+package utils;
+
+public class Dog {
+
+    public String age(Integer age) {
+        return "I'm " + age.toString() + " years";
+    }
+}
diff --git a/src/test/java/utils/TC_2_Dog.java b/src/test/java/utils/TC_2_Dog.java
new file mode 100644
index 0000000..12a057c
--- /dev/null
+++ b/src/test/java/utils/TC_2_Dog.java
@@ -0,0 +1,9 @@
+package utils;
+
+public class TC_2_Dog {
+
+    public void testDog() {
+        Dog dog = new Dog();
+        assert(dog.age(12) == "I'm 12 years");
+    }
+}