Fixed many bugs.

test/book/exchange_test.clj

@@ -1,28 +1,70 @@
 (ns book.exchange-test
+  (:import [book.PersistentSortedList])
   (:require [midje.sweet :refer :all]
             [book.exchange :refer :all]
             [book.match :refer [create-buy-book
-                                create-sell-book]]
-            [clojure.core.async :refer [chan go >!! <!!]]))
+                                create-sell-book]]))
+
+(def PersistentSortedList? (comp #(= % book.PersistentSortedList) type))
 
 (facts "the exchange as an whole"
-  (fact "sell order followed by a buy order trivialities  "
-        (let [incoming-order-channel (chan)
-              trades-channel (chan)
-              new-book-order-channel (chan)
-              master-book {:sell (create-sell-book) :buy (create-buy-book)}]
-          (go (process-orders master-book incoming-order-channel trades-channel new-book-order-channel))
-          (>!! incoming-order-channel {:type :sell :quantity 10 :price 2})
-          (<!! new-book-order-channel) => {:type :sell :quantity 10 :price 2}
-          (>!! incoming-order-channel {:type :buy :quantity 20 :price 2})
-          (<!! trades-channel) => #:book.order{:book-id nil
-                                               :order-id nil
-                                               :price 2
-                                               :quantity 10
-                                               :type :sell}
-          (<!! new-book-order-channel) => {:type :buy :quantity 10 :price 2})))
+       (fact "process-sell-order should work when book empty"
+             (let [book empty-book
+                   order {:type :sell :quantity 10 :price 2 :book.order/id 1}
+                   expt-new-sell-book [order]
+                   [{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-sell-order-2 book order)]
+               new-sell-book => expt-new-sell-book
+               new-buy-book => empty?
+               new-order => order
+               new-trades => empty?))
 
+       (fact "process-sell-order should work when there is a buy order that matches"
+             (let [sell-book (create-sell-book)
+                   buy-book (create-buy-book {:type :buy :quantity 10 :price 3 :book.order/id 2})
+                   book {:sell sell-book :buy buy-book}
+                   order {:type :sell :quantity 4 :price 2 :book.order/id 3}
+                   expt-new-buy-book [{:price 3 :quantity 6 :type :buy :book.order/id 2}]
+                   expt-new-trades [#:book.order{:book-id 2 :order-id 3 :price 3 :quantity 4 :type :buy}]
+                   [{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-order-2 book order)]
+               new-sell-book => empty?
+               new-buy-book => expt-new-buy-book
+               new-order => nil?
+               new-trades => expt-new-trades))
 
+       (fact "process-buy-order should work when book empty"
+             (let [book empty-book
+                   order {:type :buy :quantity 10 :price 2 :book.order/id 1}
+                   expt-new-sell-book [order]
+                   [{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-order-2 book order)]
+                new-sell-book => empty?
+                new-buy-book => expt-new-sell-book
+                new-order => order
+                new-trades => empty?))
 
+       (fact "process-buy-order should work when there is a buy order that matches"
+             (let [sell-book (create-sell-book {:type :sell :quantity 10 :price 3 :book.order/id 2})
+                   buy-book (create-buy-book)
+                   book {:sell sell-book :buy buy-book}
+                   order {:type :buy :quantity 4 :price 4 :book.order/id 3}
+                   expt-new-sell-book [{:price 3 :quantity 6 :type :sell :book.order/id 2}]
+                   expt-new-trades [#:book.order{:book-id 2 :order-id 3 :price 3 :quantity 4 :type :sell}]
+                   [{new-sell-book :sell new-buy-book :buy} new-order new-trades] (process-order-2 book order)]
+                new-sell-book => expt-new-sell-book
+                new-order => nil?
+                new-trades => expt-new-trades))
+
+       (fact "process-order total dance"
+             (let [book empty-book
+                   order-1 {:type :buy :quantity 10 :price 100 :book.order/id 7}
+                   order-2 {:type :buy :quantity 15 :price 99 :book.order/id 8}
+                   order-3 {:type :sell :quantity 17 :price 99 :book.order/id 9}
+                   order-4 {:type :sell :quantity 1 :price 102 :book.order/id 10}
+                   expt-book-4 {:buy [{:price 99 :quantity 8 :type :buy :book.order/id 8}]
+                                :sell [{:price 102 :quantity 1 :type :sell :book.order/id 10}]}
+                   [book-1 _ _] (process-order-2 book order-1)
+                   [book-2 _ _] (process-order-2 book-1 order-2)
+                   [book-3 _ _] (process-order-2 book-2 order-3)
+                   [book-4 _ _] (process-order-2 book-3 order-4)]
+               book-4 => expt-book-4)))