blob: 5450b8ad905e46942eaf367cdc705480f3c85d9c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
(.module:
[lux #*
[control
["." monad (#+ do Monad)]]
[data
["." number]
["." maybe]
[collection
[queue
["&" priority]]]]
[math
["r" random]]]
lux/test)
(def: (gen-queue size)
(-> Nat (r.Random (&.Queue Nat)))
(do r.Monad<Random>
[inputs (r.list size r.nat)]
(monad.fold @ (function (_ head tail)
(do @
[priority r.nat]
(wrap (&.push priority head tail))))
&.empty
inputs)))
(context: "Queues"
(<| (times 100)
(do @
[size (|> r.nat (:: @ map (n/% 100)))
sample (gen-queue size)
non-member-priority r.nat
non-member (|> r.nat (r.filter (|>> (&.member? number.Equivalence<Nat> sample) not)))]
($_ seq
(test "I can query the size of a queue (and empty queues have size 0)."
(n/= size (&.size sample)))
(test "Enqueueing and dequeing affects the size of queues."
(and (n/= (inc size)
(&.size (&.push non-member-priority non-member sample)))
(or (n/= 0 (&.size sample))
(n/= (dec size)
(&.size (&.pop sample))))))
(test "I can query whether an element belongs to a queue."
(and (and (not (&.member? number.Equivalence<Nat> sample non-member))
(&.member? number.Equivalence<Nat>
(&.push non-member-priority non-member sample)
non-member))
(or (n/= 0 (&.size sample))
(and (&.member? number.Equivalence<Nat>
sample
(maybe.assume (&.peek sample)))
(not (&.member? number.Equivalence<Nat>
(&.pop sample)
(maybe.assume (&.peek sample))))))))
))))
|