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comparison src/clojure/contrib/test_is.clj @ 10:ef7dbbd6452c

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added clojure source goodness
author Robert McIntyre <rlm@mit.edu>
date Sat, 21 Aug 2010 06:25:44 -0400
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9:35cf337adfcf 10:ef7dbbd6452c
1 ;;; test_is.clj: Compatibility layer for old clojure.contrib.test-is
2
3 ;; by Stuart Sierra, http://stuartsierra.com/
4 ;; August 28, 2009
5
6 ;; Copyright (c) Stuart Sierra, 2009. All rights reserved. The use
7 ;; and distribution terms for this software are covered by the Eclipse
8 ;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
9 ;; which can be found in the file epl-v10.html at the root of this
10 ;; distribution. By using this software in any fashion, you are
11 ;; agreeing to be bound by the terms of this license. You must not
12 ;; remove this notice, or any other, from this software.
13
14 ;; DEPRECATED in 1.2: Moved to clojure.test
15
16 (ns ^{:deprecated "1.2"
17 :doc "Backwards-compatibility for clojure.contrib.test-is
18
19 The clojure.contrib.test-is library moved from Contrib into the
20 Clojure distribution as clojure.test.
21
22 This happened on or around clojure-contrib Git commit
23 82cf0409d0fcb71be477ebfc4da18ee2128a2ad1 on June 25, 2009.
24
25 This file makes the clojure.test interface available under the old
26 namespace clojure.contrib.test-is.
27
28 This includes support for the old syntax of the 'are' macro.
29
30 This was suggested by Howard Lewis Ship in ticket #26,
31 http://www.assembla.com/spaces/clojure-contrib/tickets/26"
32 :author "Stuart Sierra"}
33 clojure.contrib.test-is
34 (:require clojure.test
35 [clojure.walk :as walk]))
36
37
38 ;;; COPY INTERNED VARS (EXCEPT are) FROM clojure.test
39
40 (doseq [v (disj (set (vals (ns-interns 'clojure.test)))
41 #'clojure.test/are)]
42 (intern *ns* (with-meta (:name (meta v)) (meta v)) (var-get v)))
43
44
45 ;;; REDEFINE OLD clojure.contrib.template
46
47 (defn find-symbols
48 "Recursively finds all symbols in form."
49 [form]
50 (distinct (filter symbol? (tree-seq coll? seq form))))
51
52 (defn find-holes
53 "Recursively finds all symbols starting with _ in form."
54 [form]
55 (sort (distinct (filter #(.startsWith (name %) "_")
56 (find-symbols form)))))
57
58 (defn find-pure-exprs
59 "Recursively finds all sub-expressions in form that do not contain
60 any symbols starting with _"
61 [form]
62 (filter #(and (list? %)
63 (empty? (find-holes %)))
64 (tree-seq seq? seq form)))
65
66 (defn flatten-map
67 "Transforms a map into a vector like [key value key value]."
68 [m]
69 (reduce (fn [coll [k v]] (conj coll k v))
70 [] m))
71
72 (defn template?
73 "Returns true if form is a valid template expression."
74 [form]
75 (if (seq (find-holes form)) true false))
76
77 (defn apply-template
78 "Replaces _1, _2, _3, etc. in expr with corresponding elements of
79 values. Returns the modified expression. For use in macros."
80 [expr values]
81 (when-not (template? expr)
82 (throw (IllegalArgumentException. (str (pr-str expr) " is not a valid template."))))
83 (let [expr (walk/postwalk-replace {'_ '_1} expr)
84 holes (find-holes expr)
85 smap (zipmap holes values)]
86 (walk/prewalk-replace smap expr)))
87
88 (defmacro do-template
89 "Repeatedly evaluates template expr (in a do block) using values in
90 args. args are grouped by the number of holes in the template.
91 Example: (do-template (check _1 _2) :a :b :c :d)
92 expands to (do (check :a :b) (check :c :d))"
93 [expr & args]
94 (when-not (template? expr)
95 (throw (IllegalArgumentException. (str (pr-str expr) " is not a valid template."))))
96 (let [expr (walk/postwalk-replace {'_ '_1} expr)
97 argcount (count (find-holes expr))]
98 `(do ~@(map (fn [a] (apply-template expr a))
99 (partition argcount args)))))
100
101
102
103 ;;; REDEFINE are MACRO TO MATCH OLD TEMPLATE BEHAVIOR
104
105 (defmacro are
106 "Checks multiple assertions with a template expression.
107 See clojure.contrib.template/do-template for an explanation of
108 templates.
109
110 Example: (are (= _1 _2)
111 2 (+ 1 1)
112 4 (* 2 2))
113 Expands to:
114 (do (is (= 2 (+ 1 1)))
115 (is (= 4 (* 2 2))))
116
117 Note: This breaks some reporting features, such as line numbers."
118 [expr & args]
119 `(do-template (is ~expr) ~@args))