done section2

src/main/java/com/zipcoder/payment/PayPal.java

@@ -38,6 +38,7 @@ public class PayPal implements Payment {
     }
 
     public int compareTo(Payment o) {
-        return 0;
+        int n = this.getShortDescription().compareTo(o.getShortDescription());
+        return n;
     }
 }

src/test/java/com/zipcoder/payment/CheckTest.java

@@ -80,6 +80,8 @@ public class CheckTest {
 
     @Test
     public void compareTo() {
+        Check check1 = new Check();
+
     }
 }
 

src/test/java/com/zipcoder/payment/PayPalTest.java

@@ -64,6 +64,43 @@ public class PayPalTest {
     }
 
     @Test
-    public void compareTo() {
+    public void compareToWhenEquals() {
+        PayPal payPal = new PayPal();
+        PayPal payPal1 = new PayPal();
+        payPal.setId(123);
+        payPal.setPayerName("Jo");
+        payPal.setEmail("jojo@gmail.com");
+        payPal1.setId(123);
+        payPal1.setPayerName("Jo");
+        payPal1.setEmail("jojo@gmail.com");
+        Assert.assertTrue(payPal.getShortDescription().compareTo(payPal1.getShortDescription())==0);
+    }
+
+    @Test
+    public void compareToWhenPayment1ComesBeforePayment2(){
+        PayPal payPal = new PayPal();
+        PayPal payPal1 = new PayPal();
+        payPal.setId(123);
+        payPal.setPayerName("Bo");
+        payPal.setEmail("bobo@gmail.com");
+        payPal1.setId(124);
+        payPal1.setPayerName("Jo");
+        payPal1.setEmail("jojo@gmail.com");
+        Assert.assertTrue(payPal.getShortDescription().compareTo(payPal1.getShortDescription())<0);
+
+    }
+
+    @Test
+    public void compareToWhenPayment1ComesAfterPayment2(){
+        PayPal payPal = new PayPal();
+        PayPal payPal1 = new PayPal();
+        payPal.setId(124);
+        payPal.setPayerName("Jo");
+        payPal.setEmail("jojo@gmail.com");
+        payPal1.setId(123);
+        payPal1.setPayerName("Bo");
+        payPal1.setEmail("bobo@gmail.com");
+        Assert.assertTrue(payPal.getShortDescription().compareTo(payPal1.getShortDescription())>0);
+
     }
 }