diff -r cda76ef561a2 Lib/formatter.py
--- a/Lib/formatter.py	Sat Aug 03 02:49:53 2013 -0700
+++ b/Lib/formatter.py	Sat Aug 03 21:19:50 2013 +0800
@@ -427,18 +427,18 @@
 def test(file = None):
     w = DumbWriter()
     f = AbstractFormatter(w)
-    if file is not None:
-        fp = open(file)
-    elif sys.argv[1:]:
-        fp = open(sys.argv[1])
-    else:
-        fp = sys.stdin
-    for line in fp:
-        if line == '\n':
-            f.end_paragraph(1)
+    if file is None:
+        if sys.argv[1:]:
+            file = sys.argv[1]
         else:
-            f.add_flowing_data(line)
-    f.end_paragraph(0)
+            file = sys.stdin
+    with open(file) as fp:
+        for line in fp:
+            if line == '\n':
+                f.end_paragraph(1)
+            else:
+                f.add_flowing_data(line)
+        f.end_paragraph(0)
 
 
 if __name__ == '__main__':