diff -r addb81a42c5d -r 2a4bc6f75e9c etwist/test/unittest_server.py
--- a/etwist/test/unittest_server.py	Thu Mar 01 17:22:56 2012 +0100
+++ b/etwist/test/unittest_server.py	Mon Feb 27 17:02:31 2012 +0100
@@ -19,8 +19,7 @@
 import os, os.path as osp, glob
 
 from cubicweb.devtools.testlib import CubicWebTC
-from cubicweb.etwist.server import (host_prefixed_baseurl, ConcatFiles,
-                                    ConcatFileNotFoundError)
+from cubicweb.etwist.server import host_prefixed_baseurl
 
 
 class HostPrefixedBaseURLTC(CubicWebTC):
@@ -54,36 +53,6 @@
         self._check('http://localhost:8080/hg/', 'code.cubicweb.org',
                     'http://localhost:8080/hg/')
 
-
 if __name__ == '__main__':
     from logilab.common.testlib import unittest_main
     unittest_main()
-
-
-
-class ConcatFilesTC(CubicWebTC):
-
-    def tearDown(self):
-        super(ConcatFilesTC, self).tearDown()
-        self._cleanup_concat_cache()
-        self.config.debugmode = False
-
-    def _cleanup_concat_cache(self):
-        uicachedir = osp.join(self.config.apphome, 'uicache')
-        for fname in glob.glob(osp.join(uicachedir, 'cache_concat_*')):
-            os.unlink(osp.join(uicachedir, fname))
-
-    def test_cache(self):
-        concat = ConcatFiles(self.config, ('cubicweb.ajax.js', 'jquery.js'))
-        self.assertTrue(osp.isfile(concat.path))
-
-    def test_404(self):
-        # when not in debug mode, should not crash
-        ConcatFiles(self.config, ('cubicweb.ajax.js', 'dummy.js'))
-        # in debug mode, raise error
-        self.config.debugmode = True
-        try:
-            self.assertRaises(ConcatFileNotFoundError, ConcatFiles, self.config,
-                              ('cubicweb.ajax.js', 'dummy.js'))
-        finally:
-            self.config.debugmode = False