public async Task BabySitterStartsWithBedtime(
string firstName,
string lastName,
string startTime,
string bedtime)
{
var sitters = await _fixture.GetBabySitters();
var sitter = sitters.FindByName(firstName, lastName);
var startDateTime = startTime.ToLocalDateTime();
var bedtimeDateTime = bedtime.ToLocalDateTime();
await _fixture.StartShift(sitter.Id, startDateTime, bedtimeDateTime);
}