Added Dog class and its respective tests: DogTest

src/main/java/Dog.java

@@ -0,0 +1,33 @@
+public class Dog implements Tradable, Domesticatable {
+
+    private int i1;
+    private String s1;
+
+    public Dog(String breed) {
+        this.s1 = breed;
+
+        if (breed.equals("Chihuahua")) {
+            this.i1 = 5;
+        } else if (breed.equals("Labrador")) {
+            this.i1 = 10;
+        } else if (breed.equals("Golden Retriever")) {
+            this.i1 = 15;
+        } else if (breed.equals("German Shepherd")) {
+            this.i1 = 20;
+        }
+    }
+
+    @Override
+    public String sound() {
+        return "Woof!";
+    }
+
+    @Override
+    public int getPrice() {
+        return this.i1;
+    }
+
+    public String getBreed() {
+        return this.s1;
+    }
+}

src/main/java/Trader.java

@@ -96,8 +96,10 @@ public static void main(String[] args) {
         List<Tradable> all_items = Arrays.asList(
                 new Horse(),
                 new Horse(),
-                new Horse()
+                new Horse(),
                 // TODO: Add Tradable objects here!
+                new Dog("Labrador"),
+                new Dog("German Shepherd")
         );
 
         /* Below, we've created two Traders. Their money, inventory, and

src/test/java/DogTest.java

@@ -0,0 +1,34 @@
+import org.junit.Before;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class DogTest {
+    Dog c;
+    Dog gs;
+
+    @Before
+    public void setUp() {
+        c = new Dog("Chihuahua");
+        gs = new Dog("German Shepherd");
+    }
+
+    @Test(timeout=50)
+    public void TestGetBreed() {
+        assertEquals("Chihuahua", c.getBreed());
+        assertEquals("German Shepherd", gs.getBreed());
+    }
+
+    @Test(timeout=50)
+    public void TestGetPrice() {
+        assertEquals(5, c.getPrice());
+        assertEquals(20, gs.getPrice());
+    }
+
+    @Test(timeout=50)
+    public void TestSound() {
+        assertEquals("Woof!", c.sound());
+        assertEquals("Woof!", gs.sound());
+        assertEquals(c.sound(), gs.sound());
+    }
+
+}