public void CreateCalendarTest()
{
var calendarOptions = new Mock <IOptions <CalendarOptions> >().Object;
var timeZoneOptions = new Mock <IOptions <TimeZoneOptions> >().Object;
var calendarService = new Mock <ICalendarManager>().Object;
var viewModel = new CalendarViewModel(calendarOptions, timeZoneOptions, calendarService);
var timeZoneId = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
var dateTimeZone = DateTimeZone.FromTimeZone(new DateTime(2021, 2, 1), timeZoneId);
var grid = viewModel.CreateCalendar(dateTimeZone, new());
Assert.NotNull(grid);
Assert.Equal(5, grid.CalendarWeeks.Count);
}