// Test case 1: insert 1 quarter, insert 1 dime and 3 nickel = 50Cents : +ve test case
 @Test
 public void testQDNNNHappy() {
   gumballM1.insertQuarter();
   gumballM1.insertDime();
   gumballM1.insertNickel();
   gumballM1.insertNickel();
   gumballM1.insertNickel();
   gumballM1.turnCrank();
   assertEquals(true, gumballM1.isGumballInSlot());
 }
 // Test case 4 :Try to take a dispensed gumball and crank the machine again without inserting any
 // coin
 @Test
 public void testTakeGumballAndCrankAgainWithoutInsertingAnyCoinQDNNN() {
   gumballM1.insertQuarter();
   gumballM1.insertDime();
   gumballM1.insertNickel();
   gumballM1.insertNickel();
   gumballM1.insertNickel();
   gumballM1.turnCrank();
   gumballM1.takeGumballFromSlot();
   soldState.turnCrank();
   assertEquals(false, gumballM1.isGumballInSlot());
 }