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+    </history-entry>
+    <history-entry file="CheckbookTest_testGetAllDebitTransactions1 - 2018.12.09 at 19h 55m 42s.xml">
+      <configuration name="CheckbookTest.testGetAllDebitTransactions1" configurationId="JUnit" />
+    </history-entry>
+    <history-entry file="CheckbookTest_testGetAllDebitTransactions2 - 2018.12.09 at 19h 55m 54s.xml">
+      <configuration name="CheckbookTest.testGetAllDebitTransactions2" configurationId="JUnit" />
+    </history-entry>
+    <history-entry file="CheckbookTest_testGetAllTransactionsForPayee1 - 2018.12.09 at 19h 56m 47s.xml">
+      <configuration name="CheckbookTest.testGetAllTransactionsForPayee1" configurationId="JUnit" />
+    </history-entry>
+    <history-entry file="CheckbookTest_testGetAllTransactionsForPayee1 - 2018.12.09 at 20h 00m 32s.xml">
+      <configuration name="CheckbookTest.testGetAllTransactionsForPayee1" configurationId="JUnit" />
+    </history-entry>
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+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/src/main/java/AccountBook.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <caret line="12" selection-start-line="12" selection-end-line="12" />
+        </state>
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+    <entry file="file://$PROJECT_DIR$/pom.xml">
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+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/TransactionType.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="15">
+          <caret line="1" column="12" selection-start-line="1" selection-start-column="12" selection-end-line="1" selection-end-column="12" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/Transaction.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="225">
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+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/GenericAccount.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="767">
+          <caret line="53" column="5" lean-forward="true" selection-start-line="53" selection-start-column="5" selection-end-line="53" selection-end-column="5" />
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+            <element signature="imports" expanded="true" />
+            <element signature="e#613#614#0" expanded="true" />
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/Payee.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="90">
+          <caret line="6" column="76" selection-start-line="6" selection-start-column="76" selection-end-line="6" selection-end-column="76" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/TestGenericAccount.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="169">
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+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/Checkbook.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="231">
+          <caret line="100" column="13" lean-forward="true" selection-start-line="100" selection-start-column="13" selection-end-line="100" selection-end-column="13" />
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/CheckbookTest.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          </folding>
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>

Checkbook/Checkbook.iml

@@ -5,12 +5,12 @@
     <output-test url="file://$MODULE_DIR$/target/test-classes" />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
     </content>
-    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Maven: junit:junit:4.0" level="project" />
+    <orderEntry type="library" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
   </component>
 </module>

Checkbook/pom.xml

@@ -23,7 +23,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.0</version>
+            <version>4.12</version>
         </dependency>
     </dependencies>
 

Checkbook/src/main/java/Checkbook.java

@@ -1,5 +1,146 @@
-public class Checkbook {
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
 
-    //blind us with your Java eloquence....
+public class Checkbook<T extends Transaction>{
+    private ArrayList<Transaction> checkBook;
+    private double cashAmount;
+    private Payee owner;
 
+    public Checkbook() {
+        this.checkBook = new ArrayList<>();
+    }
+
+    public Checkbook(double cashAmount) {
+        this.cashAmount = cashAmount;
+        this.checkBook = new ArrayList<>();
+    }
+
+    public Checkbook(Payee owner, double cashAmount) {
+        this.cashAmount = cashAmount;
+        this.owner = owner;
+        this.checkBook = new ArrayList<>();
+    }
+
+    public int size(){
+        return checkBook.size();
+    }
+
+    public boolean isEmpty(){
+        return checkBook.isEmpty();
+    }
+
+    public boolean contains(Transaction element){
+        return checkBook.contains(element);
+    }
+
+    public boolean add(Transaction element){
+        checkBook.add(element);
+        return true;
+    }
+
+    public boolean remove(Transaction element){
+        checkBook.remove(element);
+        return true;
+    }
+
+    public Iterator iterator(){
+        Iterator<Transaction> iterator = this.checkBook.listIterator();
+        return iterator;
+    }
+
+    public Transaction[] toArray(){
+        Transaction[] array = new Transaction[this.checkBook.size()];
+
+        for (int i = 0; i < checkBook.size(); i++) {
+            array[i] = checkBook.get(i);
+        }
+        return array;
+    }
+
+    public Transaction[] toArray(List<Transaction> transactions){
+        Transaction[] array = new Transaction[checkBook.size()];
+        int index = 0;
+
+        for(Transaction t:transactions){
+            array[index] = t;
+            index++;
+        }
+        return array;
+    }
+
+    // sum of all Transactions (both Debits and Credits)
+    public double checkbookValue(){
+        double value = this.cashAmount;
+        for(Transaction t:checkBook){
+            if(t.getType().equals(TransactionType.CREDIT)) {
+                value += t.getAmount();
+            }else if(t.getType().equals(TransactionType.DEBIT)) {
+                value -= t.getAmount();
+            }
+        }
+        return value;
+    }
+
+    public Transaction[] getTransactionsForDate(LocalDate aDate){
+        ArrayList<Transaction> result = new ArrayList<>();
+        for(Transaction t:checkBook){
+            if(t.getDate().equals(aDate)){
+                result.add(t);
+            }
+        }
+        return toArray(result);
+    }
+
+    public Transaction[] getAllTransactionsForPayee(Payee payee){
+        ArrayList<Transaction> result = new ArrayList<>();
+        for(Transaction t:checkBook){
+            if(t.getPayee().equals(payee)){
+                result.add(t);
+            }
+        }
+        return toArray(result);
+    }
+
+    public Transaction[] getAllDebitTransactions(){
+        ArrayList<Transaction> result = new ArrayList<>();
+        for(Transaction t:checkBook){
+            if(t.getType().equals(TransactionType.DEBIT)){
+                result.add(t);
+            }
+        }
+        return toArray(result);
+    }
+
+    public Transaction[] getAllCreditTransactions(){
+        ArrayList<Transaction> result = new ArrayList<>();
+        for(Transaction t:checkBook){
+            if(t.getType().equals(TransactionType.CREDIT)){
+                result.add(t);
+            }
+        }
+        return toArray(result);
+    }
+
+    public boolean containsAll(List<Transaction> transactions){
+        boolean result = checkBook.containsAll(transactions);
+        return result;
+    }
+
+    public boolean addAll(List<Transaction> transactions){
+
+        boolean result = checkBook.addAll(transactions);
+
+        return result;
+    }
+
+    public boolean removeAll(List<Transaction> transactions){
+        boolean result = checkBook.removeAll(transactions);
+        return result;
+    }
+
+    public void clear(){
+        checkBook = new ArrayList<>();
+    }
 }

Checkbook/src/main/java/GenericAccount.java

@@ -1,3 +1,55 @@
+import java.util.ArrayList;
+import java.util.List;
 
-public class GenericAccount {
+public class GenericAccount<T extends AccountBook> {
+
+    private Payee owner;
+    private double balance;
+    List<T> accountRecord;
+    TransactionType type;
+
+    public GenericAccount(double balance, TransactionType type) {
+        this.balance = balance;
+        this.type = type;
+        this.accountRecord = new ArrayList<>();
+    }
+
+    public GenericAccount(Payee owner, double balance, TransactionType type) {
+        this.owner = owner;
+        this.balance = balance;
+        this.type = type;
+        this.accountRecord = new ArrayList<>();
+    }
+
+    public Payee getOwner() {
+        return owner;
+    }
+
+    public void setOwner(Payee owner) {
+        this.owner = owner;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public void setBalance(double balance) {
+        this.balance = balance;
+    }
+
+    public List<T> getAccountRecord() {
+        return accountRecord;
+    }
+
+    public void setAccountRecord(List<T> accountRecord) {
+        this.accountRecord = accountRecord;
+    }
+
+    public Object getType() {
+        return type;
+    }
+
+    public void setType(TransactionType type) {
+        this.type = type;
+    }
 }

Checkbook/src/main/java/Payee.java

@@ -4,6 +4,12 @@ public class Payee {
     private String givenName;
     private String emailAddress;
 
+    public Payee(String familyName, String givenName, String emailAddress) {
+        this.familyName = familyName;
+        this.givenName = givenName;
+        this.emailAddress = emailAddress;
+    }
+
     public String getFamilyName() {
         return familyName;
     }

Checkbook/src/main/java/Transaction.java

@@ -1,7 +1,7 @@
 import java.time.LocalDate;
 import java.util.concurrent.atomic.AtomicReference;
 
-public class Transaction {
+public class Transaction implements AccountBook{
     private final AtomicReference<Integer> id = new AtomicReference<Integer>();
     private final AtomicReference<LocalDate> date = new AtomicReference<LocalDate>();
     private String memo;

Checkbook/src/test/java/CheckbookTest.java

@@ -1,12 +1,346 @@
-import static org.junit.Assert.*;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
 
 public class CheckbookTest {
+    Checkbook checkbook;
+    Transaction waterBill;
+    Transaction mortgage;
+    Transaction dateNight;
+    Payee payee1;
+    Payee payee2;
+    Payee payee3;
+
 
-    @org.junit.Before
+    @Before
     public void setUp() throws Exception {
+        checkbook = new Checkbook(payee1,2000);
+        waterBill = new Transaction("Water Bill", payee1, TransactionType.CREDIT,100.00);
+        mortgage = new Transaction("Mortgage", payee2, TransactionType.CREDIT, 1000.00);
+        dateNight = new Transaction("Date Night", payee3, TransactionType.DEBIT,150.00);
+        payee1 = new Payee("Payea", "One", "onep@email.com");
+        payee2 = new Payee("Payee","Two","twop@email.com");
+        payee3 = new Payee("Payei", "Three", "threep@email.com");
     }
 
     @org.junit.After
     public void tearDown() throws Exception {
     }
+
+    @Test
+    public void testSize1(){
+        checkbook.add(waterBill);
+
+        int expected = 1;
+        int actual = checkbook.size();
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testSize2(){
+        Assert.assertEquals(0,checkbook.size());
+    }
+
+    @Test
+    public void testSize3(){
+        checkbook.add(waterBill);
+        checkbook.add(mortgage);
+        Assert.assertEquals(2,checkbook.size());
+    }
+
+    @Test
+    public void testIsEmpty1(){
+        Assert.assertTrue(checkbook.isEmpty());
+    }
+
+    @Test
+    public void testIsEmpty2(){
+        checkbook.add(waterBill);
+        Assert.assertFalse(checkbook.isEmpty());
+    }
+
+    @Test
+    public void testContains1(){
+        Assert.assertFalse(checkbook.contains(waterBill));
+    }
+
+    @Test
+    public void testContains2(){
+        checkbook.add(mortgage);
+        Assert.assertTrue(checkbook.contains(mortgage));
+    }
+
+    @Test
+    public void testAdd1(){
+        checkbook.add(mortgage);
+        checkbook.add(waterBill);
+        Assert.assertFalse(checkbook.isEmpty());
+    }
+
+    @Test
+    public void testAdd2(){
+        checkbook.add(mortgage);
+
+        Assert.assertEquals(1,checkbook.size());
+    }
+
+    @Test
+    public void testRemove1(){
+        checkbook.add(mortgage);
+        checkbook.remove(mortgage);
+
+        Assert.assertTrue(checkbook.isEmpty());
+    }
+
+    @Test
+    public void testRemove2(){
+        checkbook.add(dateNight);
+        checkbook.add(mortgage);
+        checkbook.remove(mortgage);
+
+        Assert.assertEquals(1,checkbook.size());
+    }
+
+    @Test
+    public void testIterator1(){
+        checkbook.add(waterBill);
+        checkbook.add(dateNight);
+        Iterator<Transaction> it = checkbook.iterator();
+
+        Assert.assertNotNull(it.next());
+    }
+
+    @Test
+    public void testIterator2(){
+        checkbook.add(waterBill);
+        Iterator<Transaction> it = checkbook.iterator();
+
+        Assert.assertTrue(it.hasNext());
+    }
+
+    @Test
+    public void testToArray1(){
+        checkbook.add(waterBill);
+        checkbook.add(dateNight);
+        checkbook.add(mortgage);
+
+        Transaction[] expected = {waterBill,dateNight,mortgage};
+        Transaction[] actual = checkbook.toArray();
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testToArray2(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+
+        Transaction[] expected = {mortgage,dateNight};
+        Transaction[] actual = checkbook.toArray();
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testCheckbookValue1_afterCredit(){
+        checkbook.add(mortgage);
+
+        double expected = 1000.00;
+        double actual = checkbook.checkbookValue();
+
+        Assert.assertEquals(expected,actual,0.01);
+    }
+
+    @Test
+    public void testCheckbookValue1_afterDebit(){
+        checkbook.add(dateNight);
+
+        double expected = 1850.00;
+        double actual = checkbook.checkbookValue();
+
+        Assert.assertEquals(expected,actual,0.01);
+    }
+
+    @Test
+    public void testgetTransactionsForDate1(){
+        checkbook.add(mortgage);
+        Transaction[] expected = {mortgage};
+        Transaction[] actual = checkbook.getTransactionsForDate(LocalDate.now());
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testgetTransactionsForDate2(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+        checkbook.add(waterBill);
+        Transaction[] expected = {mortgage,dateNight,waterBill};
+        Transaction[] actual = checkbook.getTransactionsForDate(LocalDate.now());
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testGetAllTransactionsForPayee1(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+        checkbook.add(waterBill);
+
+        Transaction[] expected = {mortgage};
+        Transaction[] actual = checkbook.getAllTransactionsForPayee(payee1);
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testGetAllTransactionsForPayee3(){
+        checkbook.add(mortgage);
+
+        Assert.assertEquals(1,checkbook.getAllTransactionsForPayee(payee2).length);
+    }
+
+    @Test
+    public void testGetAllTransactionsForPayee2(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+
+        Transaction[] expected = {mortgage};
+        Transaction[] actual = checkbook.getAllTransactionsForPayee(payee2);
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testGetAllDebitTransactions1(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+        checkbook.add(waterBill);
+
+        Transaction[] expected = {dateNight};
+        Transaction[] actual = checkbook.getAllDebitTransactions();
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testGetAllDebitTransactions2(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+        checkbook.add(waterBill);
+
+        Transaction[] expected = {mortgage,dateNight};
+        Transaction[] actual = checkbook.getAllCreditTransactions();
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testGetAllDebitTransactions3(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+        checkbook.add(waterBill);
+
+        int expected = 2;
+        int actual = checkbook.getAllCreditTransactions().length;
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testContainsAll1(){
+        List list = new ArrayList();
+        list.add(mortgage);
+        list.add(dateNight);
+
+        checkbook.addAll(list);
+        Assert.assertTrue(checkbook.containsAll(list));
+    }
+
+    @Test
+    public void testContainsAll2(){
+        List list = new ArrayList();
+        list.add(mortgage);
+        list.add(dateNight);
+
+        checkbook.add(waterBill);
+
+        Assert.assertFalse(checkbook.containsAll(list));
+    }
+
+    @Test
+    public void testAddAll1(){
+        List list = new ArrayList();
+        list.add(mortgage);
+        list.add(dateNight);
+
+        checkbook.addAll(list);
+
+        Assert.assertEquals(2,checkbook.size());
+    }
+
+    @Test
+    public void testAddAll2(){
+        List list = new ArrayList();
+        list.add(mortgage);
+        list.add(dateNight);
+        list.add(mortgage);
+        list.add(waterBill);
+
+        checkbook.addAll(list);
+
+        Assert.assertEquals(4,checkbook.size());
+    }
+
+    @Test
+    public void testRemoveAll1(){
+        List list = new ArrayList();
+        list.add(mortgage);
+        list.add(dateNight);
+        list.add(mortgage);
+
+        checkbook.addAll(list);
+        checkbook.removeAll(list);
+
+        Assert.assertEquals(0,checkbook.size());
+    }
+
+    @Test
+    public void testRemoveAll2(){
+        List list = new ArrayList();
+        list.add(mortgage);
+        list.add(dateNight);
+        list.add(mortgage);
+
+        checkbook.addAll(list);
+        checkbook.removeAll(list);
+
+        Assert.assertTrue(checkbook.isEmpty());
+    }
+
+    @Test
+    public void testClear1(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+
+        checkbook.clear();
+
+        Assert.assertTrue(checkbook.isEmpty());
+    }
+
+    @Test
+    public void testClear2(){
+        checkbook.add(mortgage);
+        checkbook.add(dateNight);
+
+        checkbook.clear();
+
+        Assert.assertFalse(checkbook.contains(mortgage));
+    }
 }

Checkbook/src/test/java/TestGenericAccount.java

@@ -0,0 +1,91 @@
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class TestGenericAccount {
+    GenericAccount generic;
+    Payee payee1;
+    Payee payee2;
+    Transaction transaction1;
+    Transaction transaction2;
+    Transaction transaction3;
+
+    @Before
+    public void SetUp(){
+        payee1 = new Payee("Payea", "One", "onep@email.com");
+        payee2 = new Payee("Payee","Two","twop@email.com");
+        generic = new GenericAccount(payee1,2000.00,TransactionType.CREDIT);
+        transaction1 = new Transaction("Movies", payee1, TransactionType.CREDIT,30.00);
+        transaction2 = new Transaction("Eat Out", payee2, TransactionType.DEBIT, 50.00);
+        transaction3 = new Transaction("Groceries", payee2, TransactionType.CREDIT, 75.50);
+    }
+
+    @Test
+    public void testConstructor(){
+        Assert.assertEquals(2000.00,generic.getBalance(),0.01);
+        Assert.assertEquals(payee1, generic.getOwner());
+        Assert.assertEquals(TransactionType.CREDIT,generic.getType());
+    }
+
+    @Test
+    public void testSetGetOwner1(){
+        generic.setOwner(payee1);
+        Assert.assertEquals(payee1, generic.getOwner());
+    }
+
+    @Test
+    public void testSetGetOwner2(){
+        generic.setOwner(payee2);
+        Assert.assertEquals(payee2,generic.getOwner());
+    }
+
+    @Test
+    public void testSetGetBalance1(){
+        generic.setBalance(1000.00);
+
+        Assert.assertEquals(1000.00,generic.getBalance(),0.01);
+    }
+
+    @Test
+    public void testSetGetBalance2(){
+        generic.setBalance(12345.67);
+        Assert.assertEquals(12345.67,generic.getBalance(),0.01);
+    }
+
+    @Test
+    public void testSetAccountRecord(){
+        List<Transaction> list = new ArrayList<>();
+        list.add(transaction1);
+        list.add(transaction2);
+
+        generic.setAccountRecord(list);
+        Assert.assertEquals(transaction1,generic.getAccountRecord().get(0));
+    }
+
+    @Test
+    public void testSetAccountRecord2(){
+        List<Transaction> list = new ArrayList<>();
+        list.add(transaction1);
+        list.add(transaction2);
+
+        generic.setAccountRecord(list);
+        Assert.assertEquals(2,generic.getAccountRecord().size());
+    }
+
+    @Test
+    public void testSetGetType1(){
+        generic.setType(TransactionType.CREDIT);
+
+        Assert.assertEquals(TransactionType.CREDIT,generic.getType());
+    }
+
+    @Test
+    public void testSetGetType2(){
+        generic.setType(TransactionType.DEBIT);
+
+        Assert.assertEquals(TransactionType.DEBIT,generic.getType());
+    }
+}