@Test
 public void testSetGetCost() {
   assertEquals(equipment.getCost(), COST, 0.0);
   Double newCost = 1900.0;
   equipment.setCost(newCost);
   assertEquals(equipment.getCost(), newCost, 80000.0);
 }
 @Test
 public void testCostOf0() {
   Double newCost = 0.0;
   equipment.setCost(newCost);
   assertEquals(equipment.getCost(), newCost, 80000.0);
 }
 @Test
 public void testHighCost() {
   Double newCost = 9999.9999;
   equipment.setCost(newCost);
   assertEquals(equipment.getCost(), newCost, 80000.0);
 }