Follopw instructions to define Invoice class. The attributes are private but not final. Define required $4$ setters and $4$ getters. The InvoiceTest class should contain a main method so the JVM can run it$.$ In the main method, create an object of Invoice. Call and display that object's details and invoiceTotal. And then set its attributes with some new values, display its updated details including invoice total.package Invoice;

public class Invoice $\{$

private final String partNumber;

private final String partDescription;

private final int quantity;

private final double pricePerItem;

public Invoice$($String partNumber, String partDescription, int quantity, double pricePerItem$)\{$

this.partNumber $=$ partNumber;

this.partDescription $=$ partDescription;

this.quantity $=$ quantity;

this.pricePerItem $=$ pricePerItem;

$\}$

public double getInvoiceTotal$()\{$

if $($quantity $<0)\{$

return $0$;

$\}$ else $\{$

return quantity $*$ pricePerItem;

$\}$

$\}$

$//$ getters and setters for each attribute$/*$

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$*$ To change this template file, choose Tools $|$ Templates

$*$ and open the template in the editor.

$*/$

package Invoice;

import org.junit.jupiter.api.AfterEach;

import org.junit.jupiter.api.AfterAll;

import org.junit.jupiter.api.BeforeEach;

import org.junit.jupiter.api.BeforeAll;

import org.junit.jupiter.api.Test;

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

$/**$

$*$

$*$ @author katra

$*/$

public class InvoiceTest $\{$

public InvoiceTest$()\{$

$\}$

@BeforeAll

public static void setUpClass$()\{$

$\}$

@AfterAll

public static void tearDownClass$()\{$

$\}$

@BeforeEach

public void setUp$()\{$

$\}$

@AfterEach

public void tearDown$()\{$

$\}$

$/**$

$*$ Test of getInvoiceTotal method, of class Invoice.

$*/$

@Test

public void testGetInvoiceTotal$()\{$

System.out.println$("$getInvoiceTotal$")$;

Invoice instance $=$ null;

double expResult $=0\mathrm{.}0$;

double result $=$ instance.getInvoiceTotal$()$;

assertEquals$($expResult$,$ result, $0\mathrm{.}0)$;

$//$ TODO review the generated test code and remove the default call to fail.

fail$("$The test case is a prototype."$)$;

$\}$