public void Can_create_various_date_ranges(string date)
{
// Arrange
var anchor = DateTime.Parse(date);
dynamic result = new System.Dynamic.ExpandoObject();
string format(DateField d) => $"{d.Min.ToString(FORMAT)} => {d.Max.ToString(FORMAT)}";
// Act
result.Input = date;
var today = DateField.ForToday("today", anchor);
result.Today = format(today);
var week = DateField.ForThisWeek("week", anchor);
result.ThisWeek = format(week);
var month = DateField.ForThisMonth("month", anchor);
result.ThisMonth = format(month);
var year = DateField.ForThisYear("year", anchor);
result.ThisYear = format(year);
var json = JsonConvert.SerializeObject(result, Formatting.Indented);
// Assert
Diff.Approve(json, ".json", date);
}