diff -r df2fdd42b375 Lib/test/test_calendar.py
--- a/Lib/test/test_calendar.py	Mon Aug 26 22:28:21 2013 +0200
+++ b/Lib/test/test_calendar.py	Tue Aug 27 15:12:23 2013 -0400
@@ -3,6 +3,8 @@
 
 from test import support
 from test.script_helper import assert_python_ok
+from io import StringIO
+import unittest.mock
 import time
 import locale
 import sys
@@ -399,6 +401,34 @@
             '<tr><th colspan="7" class="month">January</th></tr>'
         )
 
+    def test_prweek(self):
+        s = StringIO()
+        with unittest.mock.patch('sys.stdout', s):
+            week = [(1,0), (2,1), (3,2), (4,3), (5,4), (6,5), (7,6)]
+            calendar.TextCalendar().prweek(week, 1)
+            self.assertEqual(s.getvalue().strip(), "1  2  3  4  5  6  7")
+        s.close()
+
+    def test_prmonth(self):
+        s = StringIO()
+        with unittest.mock.patch('sys.stdout', s):
+            calendar.TextCalendar().prmonth(2004, 1)
+            self.assertEqual(s.getvalue().strip(), result_2004_01_text.strip())
+        s.close()
+
+    def test_pryear(self):
+        s = StringIO()
+        with unittest.mock.patch('sys.stdout', s):
+            calendar.TextCalendar().pryear(2004)
+            self.assertEqual(s.getvalue().strip(), result_2004_text.strip())
+        s.close()
+
+    def test_format(self):
+        s = StringIO()
+        with unittest.mock.patch('sys.stdout', s):
+            calendar.format(["1", "2", "3"], colwidth=3, spacing=1)
+            self.assertEqual(s.getvalue().strip(), "1   2   3")
+        s.close()
 
 class CalendarTestCase(unittest.TestCase):
     def test_isleap(self):