diff -r 6b3523f81f42 -r 26744ad37953 cubicweb/server/test/unittest_migractions.py
--- a/cubicweb/server/test/unittest_migractions.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/server/test/unittest_migractions.py	Fri Apr 05 17:58:19 2019 +0200
@@ -22,6 +22,7 @@
 import sys
 from datetime import date
 from contextlib import contextmanager
+from tempfile import TemporaryDirectory
 
 from logilab.common import tempattr
 
@@ -30,7 +31,7 @@
 from cubicweb import (ConfigurationError, ValidationError,
                       ExecutionError, Binary)
 from cubicweb.devtools import startpgcluster, stoppgcluster
-from cubicweb.devtools.testlib import CubicWebTC, TemporaryDirectory
+from cubicweb.devtools.testlib import CubicWebTC
 from cubicweb.schema import constraint_name_for
 from cubicweb.server.sqlutils import SQL_PREFIX
 from cubicweb.server.migractions import ServerMigrationHelper