I need to create some three cases using mockito framework to create stubs. publi

Question

I need to create some three cases using mockito framework to create stubs.

public class calculations {
  
  

  
   // The following constants are used to indicate
       // the cost of coffee.
       public final double NO_COFFEE = 0.0;
       public final double REGULAR_COFFEE = 1.25;
       public final double DECAF_COFFEE = 1.25;
       public final double CAPPUCCINO = 2.00;

  
     
       public final double WHITE_BAGEL = 1.25;
       public final double WHEAT_BAGEL = 1.50;
            
     
     
   // The following constants are used to indicate
       // the cost of toppings.
       public final double CREAM_CHEESE = 0.50;
       public final double BUTTER = 0.25;
       public final double PEACH_JELLY = 0.75;
       public final double BLUEBERRY_JAM = 0.75;
     
     
       private final double TAX_RATE = 0.06; // Sales tax rate
         
       public double getBagelCost(String bagleType)
       {
          double bagelCost = 0.0;

          if (bagleType.equals("white"))
             bagelCost = WHITE_BAGEL;
          else
             bagelCost = WHEAT_BAGEL;

          return bagelCost;
       }
     
       public double getCoffeeCost(int coffeeSelection)
       {
          double coffeeCost = 0.0;

          if (coffeeSelection==1)
             coffeeCost = NO_COFFEE;
          else if (coffeeSelection==2)
             coffeeCost = REGULAR_COFFEE;
          else if (coffeeSelection==3)
             coffeeCost = DECAF_COFFEE;
          else
             coffeeCost = CAPPUCCINO;

          return coffeeCost;
       }
     
     
       public double getToppingCost(boolean[] topping)
       {
          double toppingCost = 0.0;

          if (topping[0])
             toppingCost += CREAM_CHEESE;
          if (topping[1])
             toppingCost += BUTTER;
          if (topping[2])
             toppingCost += PEACH_JELLY;
          if (topping[3])
             toppingCost += BLUEBERRY_JAM;

          return toppingCost;
       }

       public double[] gettheBill(String bType, int cType, boolean[] toppings)
       {
           double bill[] = new double[5];
           bill[0]= getCoffeeCost(cType);
         
           bill[1] = getBagelCost(bType);
          
           bill[2] = getToppingCost(toppings);
         
           bill[3] = (bill[0] + bill[1] + bill[3])* TAX_RATE;
         
           bill[4] = bill[0] + bill[1] + bill[2] + bill[3];
         
         
           return bill;
         
                
       }

}

Explanation / Answer

import static org.junit.Assert.*;

import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.stubbing.OngoingStubbing;

import static org.mockito.Mockito.*;

import java.util.Arrays;
public class TestCases {

   /**
   * this class creates stubs for testing the UI of the application
   * each test case will create a stub for the panel using mockitO
   */
  
   public BaglePanelView b = mock(BaglePanelView.class);
   public CoffeePanelView c = mock(CoffeePanelView.class);
   public calculations cc = new calculations();
   public ToppingPanelView t = mock(ToppingPanelView.class);
  
   //tests UI instance
   @Test
   public void test1() {
      
       when(b.getType()).thenReturn("WHITE");
       boolean[] returnThis = {false, true , false, true};
       when(t.getToppingType()).thenReturn(returnThis);
       when(c.selection()).thenReturn(2);
      
       double[] bill = cc.gettheBill(b.getType(),c.selection(), t.getToppingType());
       double[] expectedBill = {1.25, 1.5 , 1.0, .165, 3.91};
       for(int i = 0 ; i < 5; i++)
           assertEquals(bill[i], expectedBill[i], .01);
  
   }
  
   //tests UI instance
   @Test
   public void test2() {
       when(b.getType()).thenReturn("WHEAT");
       boolean[] returnThis = {true, true , true, true};
       when(t.getToppingType()).thenReturn(returnThis);
       when(c.selection()).thenReturn(4);
      
       double[] bill = cc.gettheBill(b.getType(),c.selection(), t.getToppingType());
       double[] expectedBill = {2.0, 1.5 , 2.25, .21, 5.96};
       for(int i = 0 ; i < 5; i++)
           assertEquals(bill[i], expectedBill[i], .01);
      
   }
  
   //test UI instance
   @Test
   public void test3() {
       when(b.getType()).thenReturn("WHITE");
       boolean[] returnThis = {false, false , false, true};
       when(t.getToppingType()).thenReturn(returnThis);
       when(c.selection()).thenReturn(3);
      
       double[] bill = cc.gettheBill(b.getType(),c.selection(), t.getToppingType());
       double[] expectedBill = {1.25, 1.5 , .75, .165, 3.67};
       for(int i = 0 ; i < 5; i++)
           assertEquals(bill[i], expectedBill[i], .01);
      
   }

}

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