Don't repeatedly compose on calls to use-fixtures. Fixes #194.

Updated tests and added a docstring to use-fixtures.

Signed-off-by: Chouser <chouser@n01se.net>

src/clj/clojure/test.clj

@@ -825,9 +825,13 @@ Chas Emerick, Allen Rohner, and Stuart Halloway",
   "Adds elements in coll to the current namespace metadata as the
   value of key."
   [key coll]
-  (alter-meta! *ns* assoc key (concat (key (meta *ns*)) coll)))
+  (alter-meta! *ns* assoc key coll))
 
-(defmulti use-fixtures (fn [fixture-type & args] fixture-type))
+(defmulti use-fixtures
+  "Wrap test runs in a fixture function to perform setup and
+  teardown. Using a fixture-type of :each wraps every test
+  individually, while:once wraps the whole run in a single function."
+  (fn [fixture-type & args] fixture-type))
 
 (defmethod use-fixtures :each [fixture-type & args]
   (add-ns-meta ::each-fixtures args))

test/clojure/test_clojure/test_fixtures.clj

@@ -16,6 +16,8 @@
 
 (declare *a* *b* *c* *d*)
 
+(def *n* 0)
+
 (defn fixture-a [f]
   (binding [*a* 3] (f)))
 
@@ -28,9 +30,13 @@
 (defn fixture-d [f]
   (binding [*d* 11] (f)))
 
+(defn inc-n-fixture [f]
+  (binding [*n* (inc *n*)] (f)))
+
 (use-fixtures :once fixture-a fixture-b)
 
-(use-fixtures :each fixture-c fixture-d)
+(use-fixtures :each fixture-c fixture-d inc-n-fixture)
+(use-fixtures :each fixture-c fixture-d inc-n-fixture)
 
 (deftest can-use-once-fixtures
   (is (= 3 *a*))
@@ -39,3 +45,6 @@
 (deftest can-use-each-fixtures
   (is (= 7 *c*))
   (is (= 11 *d*)))
+
+(deftest use-fixtures-replaces
+  (is (= *n* 1)))