public async Task ThenBabySitterShouldHaveCharged(string firstName, string lastName, long charge)
{
var sitters = await _fixture.GetBabySitters();
var sitter = sitters.FindByName(firstName, lastName);
var shift = await _fixture.GetBabySitterShift(sitter.Id, ScenarioContext.Current.EndedShiftId());
Assert.Equal(charge, shift.AmountCharged);
}