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;;; test_is.clj: Compatibility layer for old clojure.contrib.test-is
;; by Stuart Sierra, http://stuartsierra.com/
;; August 28, 2009
;; Copyright (c) Stuart Sierra, 2009. All rights reserved. The use
;; and distribution terms for this software are covered by the Eclipse
;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this
;; distribution. By using this software in any fashion, you are
;; agreeing to be bound by the terms of this license. You must not
;; remove this notice, or any other, from this software.
(ns #^{:doc "Backwards-compatibility for clojure.contrib.test-is
The clojure.contrib.test-is library moved from Contrib into the
Clojure distribution as clojure.test.
This happened on or around clojure-contrib Git commit
82cf0409d0fcb71be477ebfc4da18ee2128a2ad1 on June 25, 2009.
This file makes the clojure.test interface available under the old
namespace clojure.contrib.test-is.
This includes support for the old syntax of the 'are' macro.
This was suggested by Howard Lewis Ship in ticket #26,
http://www.assembla.com/spaces/clojure-contrib/tickets/26"
:author "Stuart Sierra"}
clojure.contrib.test-is
(:require clojure.test
[clojure.walk :as walk]))
;;; COPY INTERNED VARS (EXCEPT are) FROM clojure.test
(doseq [v (disj (set (vals (ns-interns 'clojure.test)))
#'clojure.test/are)]
(intern *ns* (with-meta (:name (meta v)) (meta v)) (var-get v)))
;;; REDEFINE OLD clojure.contrib.template
(defn find-symbols
"Recursively finds all symbols in form."
[form]
(distinct (filter symbol? (tree-seq coll? seq form))))
(defn find-holes
"Recursively finds all symbols starting with _ in form."
[form]
(sort (distinct (filter #(.startsWith (name %) "_")
(find-symbols form)))))
(defn find-pure-exprs
"Recursively finds all sub-expressions in form that do not contain
any symbols starting with _"
[form]
(filter #(and (list? %)
(empty? (find-holes %)))
(tree-seq seq? seq form)))
(defn flatten-map
"Transforms a map into a vector like [key value key value]."
[m]
(reduce (fn [coll [k v]] (conj coll k v))
[] m))
(defn template?
"Returns true if form is a valid template expression."
[form]
(if (seq (find-holes form)) true false))
(defn apply-template
"Replaces _1, _2, _3, etc. in expr with corresponding elements of
values. Returns the modified expression. For use in macros."
[expr values]
(when-not (template? expr)
(throw (IllegalArgumentException. (str (pr-str expr) " is not a valid template."))))
(let [expr (walk/postwalk-replace {'_ '_1} expr)
holes (find-holes expr)
smap (zipmap holes values)]
(walk/prewalk-replace smap expr)))
(defmacro do-template
"Repeatedly evaluates template expr (in a do block) using values in
args. args are grouped by the number of holes in the template.
Example: (do-template (check _1 _2) :a :b :c :d)
expands to (do (check :a :b) (check :c :d))"
[expr & args]
(when-not (template? expr)
(throw (IllegalArgumentException. (str (pr-str expr) " is not a valid template."))))
(let [expr (walk/postwalk-replace {'_ '_1} expr)
argcount (count (find-holes expr))]
`(do ~@(map (fn [a] (apply-template expr a))
(partition argcount args)))))
;;; REDEFINE are MACRO TO MATCH OLD TEMPLATE BEHAVIOR
(defmacro are
"Checks multiple assertions with a template expression.
See clojure.contrib.template/do-template for an explanation of
templates.
Example: (are (= _1 _2)
2 (+ 1 1)
4 (* 2 2))
Expands to:
(do (is (= 2 (+ 1 1)))
(is (= 4 (* 2 2))))
Note: This breaks some reporting features, such as line numbers."
[expr & args]
`(do-template (is ~expr) ~@args))
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