public async Task NextAsyncStartsAtExpectedValue()
{
var stateProvider = GetStateProvider();
var sequenceGenerator = new SequenceGenerator(stateProvider);
var sequence = await CreateSequence(stateProvider, startAt: 20);
var sequenceKey = await stateProvider.AddAsync(sequence);
var nextValue1 = await sequenceGenerator.NextAsync(sequenceKey);
var nextValue2 = await sequenceGenerator.NextAsync(sequenceKey);
Assert.IsTrue(nextValue1 == 21);
Assert.IsTrue(nextValue2 == 22);
}