use more servers for test_mutable.Update, to test #2034 properly

diff --git a/src/allmydata/test/test_mutable.py b/src/allmydata/test/test_mutable.py
index 26c7f244d3af7de9a8b01203780941c856e3ae82..890d294e84d314d1e822a9a48c72362a601ddf0e 100644 (file)
--- a/src/allmydata/test/test_mutable.py
+++ b/src/allmydata/test/test_mutable.py
@@ -3437,7 +3437,7 @@ class Update(GridTestMixin, unittest.TestCase, testutil.ShouldFailMixin):
     def setUp(self):
         GridTestMixin.setUp(self)
         self.basedir = self.mktemp()
-        self.set_up_grid()
+        self.set_up_grid(num_servers=13)
         self.c = self.g.clients[0]
         self.nm = self.c.nodemaker
         self.data = "testdata " * 100000 # about 900 KiB; MDMF