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-- setup resolver
modules = { 'predict', 'stats' }
-- mock global functions
local resolve_count = 0
local current_epoch = 0
resolve = function ()
resolve_count = resolve_count + 1
end
stats.frequent = function ()
return {
{name = 'example.com', type = 'TYPE65535'},
{name = 'example.com', type = 'SOA'},
}
end
predict.epoch = function ()
return current_epoch % predict.period + 1
end
-- test if draining of prefetch queue works
local function test_predict_drain()
resolve_count = 0
predict.queue_len = 2
predict.queue['TYPE65535 example.com'] = 1
predict.queue['SOA example.com'] = 1
predict.drain()
-- test that it attempted to prefetch
same(resolve_count, 2, 'attempted to prefetch on drain')
same(predict.queue_len, 0, 'prefetch queue empty after drain')
end
-- test if prediction process works
local function test_predict_process()
-- start new epoch
predict.process()
same(predict.queue_len, 0, 'first epoch, empty prefetch queue')
-- next epoch, still no period for frequent queries
current_epoch = current_epoch + 1
predict.process()
same(predict.queue_len, 0, 'second epoch, empty prefetch queue')
-- next epoch, found period
current_epoch = current_epoch + 1
predict.process()
same(predict.queue_len, 2, 'third epoch, prefetching')
-- drain works with scheduled prefetches (two batches)
resolve_count = 0
predict.drain()
predict.drain()
same(resolve_count, 2, 'attempted to resolve queries in queue')
same(predict.queue_len, 0, 'prefetch queue is empty')
end
-- return test set
return {
test_predict_drain,
test_predict_process
}
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