Question

For this activity you will create unit tests using JUnit and some of the available features of JUnit adhering to the Arrange, Act, Assert (AAA) unit testing methodology.

Specifications:

• Select two different parts of your course project to unit test.
• You will create two separate test class files in JUnit in the appropriate area.
• Each JUnit test class must include the following:
  • At least two @Test methods.
  • Appropriate assertions.
• One or more JUnit test class must include the following:
  • @Before method.

I'm not getting how to create the tests. I'm attempting to create tests on the GroceryDriver Class and Queue Class

Original Code so far is found at : https://github.com/GiantPygmy/GroceryCalculator

Answer 1

JUnit test cases :-

1) make no chage in Grocery.java

2) Add test cases to Main.java as shown below

//----Main.java

//Main class
import org.junit.Assert;
import org.junit.*;

import static org.junit.Assert.*;

import java.util.Scanner;

public class Main {

//create a method to check validity of cost

static boolean validatecost(String cost) {

int cost1 =Integer.parseInt(cost);

if (cost1>0) {return true;}

else

return false;
}
//Junit test to check validatecost() function gives no error
@Test
public void testJUnitValidateCostPositive() {

assertTrue(validatecost("2"));

}
//Junit test to check validatecost() function gives that error
@Test
public void testJUnitValidateCostNegative() {

assertTrue(validatecost("0"));

}

//create a method to check validity of quantity

static boolean validatequantity(String quantity) {

int quant =Integer.parseInt(quantity);

if (quant>=1) {return true;}

else

return false;
}

//Junit test to check validatecost() function gives no error
@Test
public void testJUnitValidateQuantityPositive() {

assertTrue(validatequantity("2"));

}
//Junit test to check validatecost() function gives that error
@Test
public void testJUnitValidateQuantityNegative() {

assertTrue(validatequantity("0"));

}

//JUnit test case to test Constructor of Grocery

@Test
public void testGroceryConstructor() {

/// arrange
Grocery obj;

///act
obj=new Grocery("mango",10,50);

///assert
assertEquals(obj.getName(),"mango");
assertTrue(obj.getQuantity()==10);
assertTrue(obj.getCost()==50);

}

//JUnit test case to test set/get methods of Grocery

@Test
public void testGrocerySetMethods() {

/// arrange
Grocery obj=new Grocery();

///act
obj.setName("mango");
obj.setCost(50);
obj.setQuantity(10);

///assert
assertEquals(obj.getName(),"mango");
assertTrue(obj.getQuantity()==10);
assertTrue(obj.getCost()==50);

}

/*

IF above test cases works fine then there is no need to test below code as it consists of the same (unit) functions

*/

//create a method to prompt user input

static String[] promptinput() {

System.out.println("Enter the choice 1 if you need to input");

Scanner sc = new Scanner(System.in);

int choice = sc.nextInt();

String[] input = new String[100];

String tempinput;

//takes input when choice =1

if(choice==1) {

int i=0;

Scanner sc1= new Scanner(System.in);

do{ System.out.println("Enter the grocery name,quantity and cost in that order and press -1 when done");

input[i] = sc.next();

tempinput = input[i];

i++;

}

while(!tempinput.contentEquals("-1"));

choice=0;

}

else {System.out.println("You do not wish to enter input.Exiting");}

return input;

} ///promptUser

//declare main method

public static void main(String[] args) {

// TODO Auto-generated method stub

String[] input = new String[100];

System.out.println("Enter the First grocery details");

input = promptinput();

if(validatecost(input[1])) {

if(validatequantity(input[2])) {

int quant =Integer.parseInt(input[1]);

int cost =Integer.parseInt(input[2]);

MyClass g0 = new MyClass( input[0], quant,cost);

System.out.println("The name:" + g0.getName().toString() + " quantity: " + g0.getQuantity() + " cost: " + g0.getCost());

}

}

else {System.out.println("Wrong input entered");}

System.out.println("Enter the Second grocery details");

input = promptinput();

if(validatecost(input[1])) {

if(validatequantity(input[2])) {

int quant =Integer.parseInt(input[1]);

int cost =Integer.parseInt(input[2]);

MyClass g1 = new MyClass( input[0], quant,cost);

System.out.println("The name:" + g1.getName().toString() + " quantity: " + g1.getQuantity() + " cost: " + g1.getCost());

}

}

else {System.out.println("Wrong input entered");}

System.out.println("Enter the Third grocery details");

input = promptinput();

if(validatecost(input[2])) {

if(validatequantity(input[1])) {

int quant =Integer.parseInt(input[1]);

int cost =Integer.parseInt(input[2]);

MyClass g2 = new MyClass( input[0], quant,cost);

System.out.println("The name:" + g2.getName().toString() + " quantity: " + g2.getQuantity() + " cost: " + g2.getCost());

}

}

else {System.out.println("Wrong input entered");}

}

}