public async Task WhenProjectionExpiresBeforeUpdateIsFinished_ExpiredDataIsStillAccessible()
{
// Reconfigure from setup
_expiration = TimeSpan.FromSeconds(0.25);
_updateDuration = TimeSpan.FromSeconds(0.5);
_sut = Model.Create(_expiration, _projectionDataService, _sleeper);
await _sut.GetLatestProjectionTime();
Thread.Sleep(_expiration.Add(TimeSpan.FromSeconds(0.25))); // Expire
var query1 = await _sut.GetLatestProjectionTime(); // Trigger update
Assert.That(query1, Is.Not.Null);
Assert.That(_sut.State, Is.InstanceOf <UpdatingState <Department> >());
var query2 = await _sut.GetLatestProjectionTime();
Assert.That(query2, Is.Not.Null);
Assert.That(query1, Is.EqualTo(query2), "The previous projection should be returned during the Updating state.");
Thread.Sleep(_updateDuration); // Wait for update to finish
Thread.Sleep(_expiration.Add(TimeSpan.FromSeconds(0.25))); // Expire
Assert.That(_sut.State, Is.InstanceOf <ExpiredState <Department> >());
}
public async Task WhenInitialising_CreatesProjection_ThenReturnsCurrentItems()
{
var query1 = await _sut.GetLatestProjectionTime(); // Create projection
var query2 = await _sut.GetLatestProjectionTime(); // Still in valid state
Assert.That(query1, Is.EqualTo(query2), "The projection system should return the cached projection, when in Valid state.");
}