update;

src/main/java/rocks/zipcode/quiz3a/collections/Bank.java

@@ -8,18 +8,14 @@ import java.util.List;
  * @author leon on 27/12/2018.
  */
 public class Bank {
-    public List<BankAccount> getBankAccounts() {
+    public BankAccount removeBankAccountByIndex(Integer indexNumber) {
         return null;
     }
 
-    public void setBankAccounts(List<BankAccount> bankAccounts) {
+    public void addBankAccount(BankAccount bankAccount) {
     }
 
-    public BankAccount findBankAccountById(Long id) {
-        return null;
-    }
-
-    public BankAccount removeBankAccount(Long id) {
-        return null;
+    public Boolean containsBankAccount(BankAccount bankAccount) {
+        throw new UnsupportedOperationException("Method not yet implemented");
     }
 }

src/main/java/rocks/zipcode/quiz3a/collections/WordCounter.java

@@ -3,6 +3,9 @@ package rocks.zipcode.quiz3a.collections;
 import java.util.Map;
 
 public class WordCounter {
+    public WordCounter(String... strings) {
+    }
+
     public static Map<String, Integer> getWordCountMap() {
         return null;
     }

src/test/java/rocks/zipcode/quiz3a/collections/bank/AddBankAccountTest.java

@@ -0,0 +1,22 @@
+package rocks.zipcode.quiz3a.collections.bank;
+
+import org.junit.Assert;
+import org.junit.Test;
+import rocks.zipcode.quiz3a.collections.Bank;
+import rocks.zipcode.quiz3a.objectorientation.account.BankAccount;
+
+public class AddBankAccountTest {
+    @Test
+    public void test1() {
+        // given
+        Bank bank = new Bank();
+        BankAccount bankAccount = new BankAccount();
+        Assert.assertFalse(bank.containsBankAccount(bankAccount));
+
+        // when
+        bank.addBankAccount(bankAccount);
+
+        // then
+        Assert.assertTrue(bank.containsBankAccount(bankAccount));
+    }
+}

src/test/java/rocks/zipcode/quiz3a/collections/bank/FindBankAccountByIdTest.java

@@ -1,4 +0,0 @@
-package rocks.zipcode.quiz3a.collections.bank;
-
-public class FindBankAccountByIdTest {
-}

src/test/java/rocks/zipcode/quiz3a/collections/bank/RemoveBankAccountByIndexTest.java

@@ -0,0 +1,44 @@
+package rocks.zipcode.quiz3a.collections.bank;
+
+import org.junit.Assert;
+import org.junit.Test;
+import rocks.zipcode.quiz3a.collections.Bank;
+import rocks.zipcode.quiz3a.objectorientation.account.BankAccount;
+
+public class RemoveBankAccountByIndexTest {
+    @Test
+    public void test1() {
+        // given
+        Bank bank = new Bank();
+        BankAccount bankAccount = new BankAccount();
+        bank.addBankAccount(bankAccount);
+        Assert.assertTrue(bank.containsBankAccount(bankAccount));
+
+        // when
+        bank.removeBankAccountByIndex(0);
+
+        // then
+        Assert.assertFalse(bank.containsBankAccount(bankAccount));
+    }
+
+    @Test
+    public void test2() {
+        // given
+        Bank bank = new Bank();
+        BankAccount bankAccount1 = new BankAccount();
+        BankAccount bankAccount2 = new BankAccount();
+
+        bank.addBankAccount(bankAccount1);
+        bank.addBankAccount(bankAccount2);
+
+        Assert.assertTrue(bank.containsBankAccount(bankAccount1));
+        Assert.assertTrue(bank.containsBankAccount(bankAccount2));
+
+        // when
+        bank.removeBankAccountByIndex(1);
+
+        // then
+        Assert.assertTrue(bank.containsBankAccount(bankAccount1));
+        Assert.assertFalse(bank.containsBankAccount(bankAccount2));
+    }
+}

src/test/java/rocks/zipcode/quiz3a/collections/bank/RemoveBankAccountTest.java

@@ -1,4 +0,0 @@
-package rocks.zipcode.quiz3a.collections.bank;
-
-public class RemoveBankAccountTest {
-}

src/test/java/rocks/zipcode/quiz3a/collections/bank/SetBankAccountsTest.java

@@ -1,4 +0,0 @@
-package rocks.zipcode.quiz3a.collections.bank;
-
-public class SetBankAccountsTest {
-}