/*
 As a user
 I need see a screen
 So that I can see my computation results
 */
 @Test
 public void testCurrencyList() {
   CurrencyFragment wheel =
       (CurrencyFragment) activity.getFragmentManager().findFragmentById(R.id.currency_wheel);
   //  Then I should see list of currency option
   assertTrue(wheel.isAdded());
   assertNotNull(wheel);
 }
 /*
 As a user
 I need to see numbered buttons
 so that I can do numeric computations
 */
 @Test
 public void testKeypad() {
   //  Then I should see numbered buttons
   //  And basic calculator operations
   KeypadFragment keypad =
       (KeypadFragment) activity.getFragmentManager().findFragmentById(R.id.keypad);
   assertTrue(keypad.isAdded());
   assertNotNull(keypad);
 }
 /*
 As a user
 I need see a screen
 So that I can see my computation results
 */
 @Test
 public void testScreen() {
   DisplayFragment screen =
       (DisplayFragment) activity.getFragmentManager().findFragmentById(R.id.screen);
   //  Then I should see a space for computation results
   assertTrue(screen.isAdded());
   assertNotNull(screen);
   //  And space should contains initial value of '0'
   assertEquals("0", screen.getDisplayText());
 }