The unit poweroff test works fine, but the mysql shutdown test fails in my test run:

juju-test.conductor.20-broken-mysqld.py DEBUG   : Running 20-broken-mysqld.py (tests/20-broken-mysqld.py)
2015-04-13 10:41:54 Starting deployment of devel
2015-04-13 10:41:54 Deploying services...
2015-04-13 10:41:55  Deploying service hacluster using cs:trusty/hacluster-18
2015-04-13 10:41:59  Deploying service percona-cluster using local:trusty/percona-cluster
2015-04-13 10:42:13 Config specifies num units for subordinate: hacluster
2015-04-13 10:44:58 Adding relations...
2015-04-13 10:44:58  Adding relation percona-cluster:ha <-> hacluster:ha
2015-04-13 10:46:07 Deployment complete in 253.46 seconds
Traceback (most recent call last):
  File "tests/20-broken-mysqld.py", line 38, in <module>
    t.run()
  File "tests/20-broken-mysqld.py", line 31, in run
    assert changed, "The master didn't change"
AssertionError: The master didn't change
juju-test.conductor.20-broken-mysqld.py DEBUG   : percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
stopping mysql in {'subordinates': {'hacluster/2': {'unit': '2', 'upgrading-from': 'cs:trusty/hacluster-18', 'agent-version': '1.23-beta4', 'service': 'hacluster', 'agent-state': 'started', 'unit_name': 'hacluster/2', 'public-address': '10.5.15.143'}}, 'unit': '1', 'machine': '2', 'agent-version': '1.23-beta4', 'service': 'percona-cluster', 'public-address': '10.5.15.143', 'unit_name': 'percona-cluster/1', 'agent-state': 'started'}
looking for the new master
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1
percona-cluster/0
ERROR subprocess encountered error code 1
percona-cluster/1
inet 10.5.100.1/24 brd 10.5.100.255 scope global eth0
vip(10.5.100.1) running in percona-cluster/1

juju-test.conductor.20-broken-mysqld.py DEBUG   : Got exit code: 1
juju-test.conductor.20-broken-mysqld.py RESULT  : ✘
juju-test.conductor DEBUG   : Tearing down devel juju environment
juju-test.conductor DEBUG   : Calling "juju destroy-environment -y devel"
WARNING cannot delete security group "juju-devel-0". Used by another environment?
juju-test INFO    : Results: 2 passed, 1 failed, 0 errored
ERROR subprocess encountered error code 1