71 lines
3.8 KiB
Clojure
71 lines
3.8 KiB
Clojure
(ns book.exchange-test
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(:import [book.PersistentSortedList])
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(:require [midje.sweet :refer :all]
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[book.exchange :refer :all]
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[book.match :refer [create-buy-book
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create-sell-book]]))
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(def PersistentSortedList? (comp #(= % book.PersistentSortedList) type))
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(facts "the exchange as an whole"
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(fact "process-sell-order should work when book empty"
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(let [book empty-book
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order {:type :sell :quantity 10 :price 2 :book.order/id 1}
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expt-new-sell-book [order]
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[{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-sell-order-2 book order)]
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new-sell-book => expt-new-sell-book
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new-buy-book => empty?
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new-order => order
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new-trades => empty?))
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(fact "process-sell-order should work when there is a buy order that matches"
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(let [sell-book (create-sell-book)
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buy-book (create-buy-book {:type :buy :quantity 10 :price 3 :book.order/id 2})
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book {:sell sell-book :buy buy-book}
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order {:type :sell :quantity 4 :price 2 :book.order/id 3}
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expt-new-buy-book [{:price 3 :quantity 6 :type :buy :book.order/id 2}]
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expt-new-trades [#:book.order{:book-id 2 :order-id 3 :price 3 :quantity 4 :type :buy}]
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[{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-order-2 book order)]
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new-sell-book => empty?
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new-buy-book => expt-new-buy-book
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new-order => nil?
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new-trades => expt-new-trades))
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(fact "process-buy-order should work when book empty"
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(let [book empty-book
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order {:type :buy :quantity 10 :price 2 :book.order/id 1}
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expt-new-sell-book [order]
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[{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-order-2 book order)]
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new-sell-book => empty?
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new-buy-book => expt-new-sell-book
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new-order => order
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new-trades => empty?))
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(fact "process-buy-order should work when there is a buy order that matches"
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(let [sell-book (create-sell-book {:type :sell :quantity 10 :price 3 :book.order/id 2})
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buy-book (create-buy-book)
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book {:sell sell-book :buy buy-book}
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order {:type :buy :quantity 4 :price 4 :book.order/id 3}
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expt-new-sell-book [{:price 3 :quantity 6 :type :sell :book.order/id 2}]
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expt-new-trades [#:book.order{:book-id 2 :order-id 3 :price 3 :quantity 4 :type :sell}]
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[{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-order-2 book order)]
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new-sell-book => expt-new-sell-book
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new-order => nil?
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new-trades => expt-new-trades))
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(fact "process-order total dance"
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(let [book empty-book
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order-1 {:type :buy :quantity 10 :price 100 :book.order/id 7}
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order-2 {:type :buy :quantity 15 :price 99 :book.order/id 8}
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order-3 {:type :sell :quantity 17 :price 99 :book.order/id 9}
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order-4 {:type :sell :quantity 1 :price 102 :book.order/id 10}
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expt-book-4 {:buy [{:price 99 :quantity 8 :type :buy :book.order/id 8}]
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:sell [{:price 102 :quantity 1 :type :sell :book.order/id 10}]}
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[book-1 _ _] (process-order-2 book order-1)
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[book-2 _ _] (process-order-2 book-1 order-2)
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[book-3 _ _] (process-order-2 book-2 order-3)
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[book-4 _ _] (process-order-2 book-3 order-4)]
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book-4 => expt-book-4)))
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