anchor.diff:        expect(compare, isNegative);
       });
   
  -    test('Calendar month as string', () {
  +    test('Calendar.EraAsFullString', () {
  +      calendar.ChangeCalendarSystem('GregorianCalendar');
  +      expect(calendar.EraAsFullString(), equals('A.D.'));
  +    });
  +
  +    test('Calendar.MonthAsFullString', () {
         // Repeat to ensure that this doesn't fail because of some kind of memory
         // issue.
         for (var i = 0; i < 10000; i++) {
  
positive.code:       expect(compare, isZero);
      });
  
      test('Add and delete days 2', () {
        final original = calendar.Clone();
        calendar
          ..AddDays(2)
  
negative.code:       expect(compare, isPositive);
      });
  
      test('Compare negative', () {
        final original = calendar.Clone();
        calendar
          ..AddDays(2)
  