diff -r 000000000000 -r b97547f5f1fa common/test/unittest_utils.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/common/test/unittest_utils.py	Wed Nov 05 15:52:50 2008 +0100
@@ -0,0 +1,47 @@
+"""unit tests for module cubicweb.common.utils"""
+
+from logilab.common.testlib import TestCase, unittest_main
+
+from cubicweb.common.utils import make_uid, UStringIO, SizeConstrainedList
+
+
+class MakeUidTC(TestCase):
+    def test_1(self):
+        self.assertNotEquals(make_uid('xyz'), make_uid('abcd'))
+        self.assertNotEquals(make_uid('xyz'), make_uid('xyz'))
+        
+    def test_2(self):
+        d = {}
+        while len(d)<10000:
+            uid = make_uid('xyz')
+            if d.has_key(uid):
+                self.fail(len(d))
+            d[uid] = 1
+
+        
+class UStringIOTC(TestCase):
+    def test_boolean_value(self):
+        self.assert_(UStringIO())
+
+
+class SizeConstrainedListTC(TestCase):
+
+    def test_append(self):
+        l = SizeConstrainedList(10)
+        for i in xrange(12):
+            l.append(i)
+        self.assertEquals(l, range(2, 12))
+    
+    def test_extend(self):
+        testdata = [(range(5), range(5)),
+                    (range(10), range(10)),
+                    (range(12), range(2, 12)),
+                    ]
+        for extension, expected in testdata:
+            l = SizeConstrainedList(10)
+            l.extend(extension)
+            yield self.assertEquals, l, expected
+
+   
+if __name__ == '__main__':
+    unittest_main()