public async Task WhenBabySitterLeaves(string firstName, string lastName, string endTime)
{
var sitters = await _fixture.GetBabySitters();
var sitter = sitters.FindByName(firstName, lastName);
var shifts = await _fixture.GetBabySitterShifts(sitter.Id);
var currentShift = shifts.Single(s => s.EndTime == null);
var endDateTime = endTime.ToLowerInvariant().Contains("am")
? endTime.ToLocalDateTime().PlusDays(1)
: endTime.ToLocalDateTime();
await _fixture.EndShift(sitter.Id, currentShift.Id, endDateTime);
ScenarioContext.Current.EndedShiftId(currentShift.Id);
}