complete

pom.xml

     <groupId>com.zipcoder</groupId>
     <artifactId>payment</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <dependencies>
         <dependency>
             <groupId>junit</groupId>

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

     }
 
 
+    public int compareTo(Payment o) {
+        return this.getShortDescription().compareTo(o.getShortDescription());
 
+    }
 }

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

     public String getShortDescription() {
         return "CC" + " " + payerName + " " + number.substring(number.length()-4, number.length()) + " " + expiredMonth + "/" + expiredYear;
     }
+
+    public int compareTo(Payment o) {
+        return this.getShortDescription().compareTo(o.getShortDescription());
+
+    }
 }

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

     public String getShortDescription() {
         return "PayPal" + " " + payerName + " " + email;
     }
+
+    public int compareTo(Payment o) {
+        return this.getShortDescription().compareTo(o.getShortDescription());
+
+    }
 }

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

 package com.zipcoder.payment;
 
-public interface Payment {
+public interface Payment extends Comparable<Payment>{
     public Long getId();
+
     public String getPayerName();
+
     public String getShortDescription();
 }

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

 package com.zipcoder.payment;
 
+import java.util.Arrays;
+import java.util.Comparator;
+
 public class PaymentPresenter {
 
 
+    public String toString(Payment[] payments) {
+        StringBuilder result = new StringBuilder();
+        Arrays.sort(payments);
+        for (int i = 0; i < payments.length; i++) {
+            result.append(payments[i].getShortDescription() + "\n");
+        }
+        return result.toString();
+    }
+
+    public String toStringByPayerName(Payment[] payments) {
+        StringBuilder result = new StringBuilder();
+        Arrays.sort(payments, new PaymentSortByPayer());
+        for (int i = 0; i < payments.length; i++) {
+            result.append(payments[i].getShortDescription() + "\n");
+        }
+        return result.toString();
+    }
+    public String toStringById(Payment[] payments) {
+        StringBuilder result = new StringBuilder();
+        Arrays.sort(payments, Comparator.comparing(Payment::getId));
+        for (int i = 0; i < payments.length; i++) {
+            result.append(payments[i].getShortDescription() + "\n");
+        }
+        return result.toString();
+    }
 }

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

+package com.zipcoder.payment;
+
+import java.util.Comparator;
+
+public class PaymentSortByPayer implements Comparator<Payment> {
+
+
+    public int compare(Payment o1, Payment o2) {
+        return o1.getPayerName().compareTo(o2.getPayerName());
+    }
+}

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

 package com.zipcoder.payment;
 
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
 public class CheckTest {
-    Check test = new Check(2L, "donna", "987654321", "1234567890");
+    Check test;
+    Check test1;
 
+    @Before
+    public void before() {
+        test = new Check(2L, "donna", "987654321", "1234567890");
+        test1 = new Check(7L, "marie", "987654301", "1234567800");
+    }
 
     @Test
     public void getIdTest() {
         Assert.assertEquals(expected, actual);
 
     }
+    @Test
+    public void compareToTest() {
+        int actual = test.compareTo(test1);
+        Assert.assertTrue(actual < 0);
+    }
 }

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

 package com.zipcoder.payment;
 
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
 public class CreditCardTest {
-    CreditCard test = new CreditCard(1L, "donna", "1234567890", 10, 2020);
 
+    CreditCard test;
+    CreditCard test1;
 
+    @Before
+    public void before() {
+    test = new CreditCard(1L, "donna", "1234567890", 10, 2020);
+    test1 = new CreditCard(6L, "marie", "1234507890", 1, 2022);
+}
     @Test
     public void getIdTest() {
         Long expected = 1L;
         Assert.assertEquals(expected, actual);
 
     }
+    @Test
+    public void compareToTest() {
+        int actual = test.compareTo(test1);
+        Assert.assertTrue(actual < 0);
+    }
 
 }
 

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

 package com.zipcoder.payment;
 
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
 public class PayPalTest {
-    PayPal test = new PayPal(3L, "donna", "donna@jacobs.com");
+    PayPal test;
+    PayPal test1;
 
+    @Before
+    public void before() {
+        test = new PayPal(3L, "donna", "donna@jacobs.com");
+        test1 = new PayPal(8L, "marie", "marie@jacobs.com");
+    }
 
     @Test
     public void getIdTest() {
         Assert.assertEquals(expected, actual);
 
     }
+    @Test
+    public void compareToTest() {
+        int actual = test.compareTo(test1);
+        Assert.assertTrue(actual < 0);
+    }
 }

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

 package com.zipcoder.payment;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class PaymentPresenterTest {
+
+    @Test
+    public void toStringPaymentTest(){
+        Payment[] payments = new Payment[0];
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "";
+
+        String actual = presenter.toString(payments);
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void toStringMultiplePaymentTest() {
+        Payment[] payments = new Payment[2];
+        Payment paypal = new PayPal(4L, "Tia Mowry", "tia@mowry.com");
+        Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551");
+
+        payments[0] = paypal;
+        payments[1] = check;
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "Check Tia Mowry ***4551\nPayPal Tia Mowry tia@mowry.com\n";
+
+        String actual = presenter.toString(payments);
+        Assert.assertEquals(expected, actual);
+
+    }
+
+    @Test
+    public void toStringByPayerName() {
+        Payment[] payments = new Payment[2];
+        Payment paypal = new PayPal(4L, "Tamara Mowry", "tamara@mowry.com");
+        Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551");
+
+        payments[0] = paypal;
+        payments[1] = check;
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "PayPal Tamara Mowry tamara@mowry.com\nCheck Tia Mowry ***4551\n";
+
+        String actual = presenter.toStringByPayerName(payments);
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void toStringByIdTest() {
+        Payment[] payments = new Payment[2];
+        Payment paypal = new PayPal(81L, "Tamara Mowry", "tamara@mowry.com");
+        Payment check = new Check(120L, "Tia Mowry", "11432543", "134344551");
+
+        payments[0] = paypal;
+        payments[1] = check;
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "PayPal Tamara Mowry tamara@mowry.com\nCheck Tia Mowry ***4551\n";
+
+        String actual = presenter.toStringById(payments);
+        Assert.assertEquals(expected, actual);
+    }
+
 }

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

+package com.zipcoder.payment;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class PaymentSortByPayerTest {
+    CreditCard creditCard;
+    Check check;
+    PaymentSortByPayer test;
+
+    @Before
+    public void setUp() {
+        creditCard = new CreditCard(6L, "marie", "1234507890", 1, 2022);
+        check = new Check(2L, "donna", "987654321", "1234567890");
+        test = new PaymentSortByPayer();
+    }
+
+    @Test
+    public void compareTest() {
+        int actual = test.compare(creditCard, check);
+        Assert.assertTrue(actual > 0);
+
+    }
+}