Question

You are required to write 4 significant JUnit tests for the Account class outlined below taking into account the specifications below. Your code must include 3 negative test cases.

Specifications for the Account class:

• The constructor takes as arguments the name, ID and the initial balance.
• The withdrawn method allows any specified amount between $20 and $1000 to be withdrawn but the withdrawn amount cannot exceed the current balance.
• The withdraw method is expected to throw the AmtTooLow exception if the amount specified is below $20 and the AmtTooHigh exception if the amount exceeds $1000.
• The withdraw method is expected to throw InsuffientBalance if the amount specified exceeds the balance.

// The outline of Account class. You are not required to complete these 

public class Account {
     …
     public Account(String name, String ID, double amt)
     {   ….

     }
     public double withdraw(double amt) throws AmtTooLow, AmtTooHigh, InsuffientBalance
     {  … 




     }
}

You are required to write the methods with the @Before and @Test annotations only. You should not attempt to run these tests (as the Account class is not complete).

// you need not write the include

public class AccountTest {

// Code to be inserted in the box

Answer 1

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public class AmtTooLow extends Exception {
   public AmtTooLow() {
       super("Amount is Too Low");
   }
}

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public class AmtTooHigh extends Exception {
   public AmtTooHigh() {
       super("Amount is Too High");
   }
}

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public class InsuffientBalance extends Exception {
   public InsuffientBalance() {
       super("insufficient balance");
   }
}

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public class Account {
   private String name;
   private String ID;
   private double bal;
public Account(String name, String ID, double amt)
{
   this.setName(name);
   this.setID(ID);
   this.bal=amt;
}

public double withdraw(double amt) throws AmtTooLow, AmtTooHigh, InsuffientBalance
{
   if(amt<20) {
       throw new AmtTooLow();
   }
   if(amt>1000) {
       throw new AmtTooHigh();
   }
   if(bal<amt) {
       throw new InsuffientBalance();
   }

   bal-=amt;
   return bal;
}
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getID() {
       return ID;
   }
   public void setID(String iD) {
       ID = iD;
   }
   public double getBalance() {
       return this.bal;
   }
}

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import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.Test;

class AccountTest {

   @Test
   void testAccount() {
       Account account=new Account("Customer1","ABC112",679.88);
       double bal=account.getBalance();
       assertEquals(bal,679.88);
       try {
           bal=account.withdraw(123);
           assertEquals(bal,556.88);          
           bal=account.withdraw(35);
           assertEquals(bal,521.88);
           bal=account.withdraw(83);
           assertEquals(bal,438.88);
          
       } catch (AmtTooLow | AmtTooHigh | InsuffientBalance e) {
           e.printStackTrace();
       }
      
      
   }

   @Test
   void testAmountLow() {
       Account account=new Account("Customer1","ABC112",679.88);
       Exception exception = assertThrows(Exception.class, () -> account.withdraw(12));
       assertEquals("Amount is Too Low", exception.getMessage());
   }
  
  
   @Test
   void testAmountHigh() {
       Account account=new Account("Customer1","ABC112",679.88);
       Exception exception = assertThrows(Exception.class, () -> account.withdraw(1001));
       assertEquals("Amount is Too High", exception.getMessage());
   }
  
  
   @Test
   void testInsufficientBal() {
       Account account=new Account("Customer1","ABC112",79.88);
       Exception exception = assertThrows(Exception.class, () -> account.withdraw(91));
       assertEquals("insufficient balance", exception.getMessage());
   }
  
}

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