Implement container lifecycle watcher

state/machine_test.go

 // Copyright 2012, 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 
 package state_test
 
 import (
         . "launchpad.net/gocheck"
         "launchpad.net/juju-core/constraints"
         "launchpad.net/juju-core/errors"
         "launchpad.net/juju-core/state"
@@ skipping 174 matching lines @@
 func (s *MachineSuite) TestTag(c *C) {
         c.Assert(s.machine.Tag(), Equals, "machine-0")
 }
 
 func (s *MachineSuite) TestMachineTag(c *C) {
         c.Assert(state.MachineTag("10"), Equals, "machine-10")
         // Check a container id.
         c.Assert(state.MachineTag("10/lxc/1"), Equals, "machine-10-lxc-1")
 }
 
+func (s *MachineSuite) TestMachineIdFromTag(c *C) {
+        c.Assert(state.MachineIdFromTag("machine-10"), Equals, "10")
+        // Check a container id.
+        c.Assert(state.MachineIdFromTag("machine-10-lxc-1"), Equals, "10/lxc/1")
+        // Check reversability.
+        nested := "2/kvm/0/lxc/3"
+        c.Assert(state.MachineIdFromTag(state.MachineTag(nested)), Equals, nested)
+}
+
 func (s *MachineSuite) TestSetMongoPassword(c *C) {
         testSetMongoPassword(c, func(st *state.State) (entity, error) {
                 return st.Machine(s.machine.Id())
         })
 }
 
 func (s *MachineSuite) TestSetPassword(c *C) {
         testSetPassword(c, func() (state.Authenticator, error) {
                 return s.State.Machine(s.machine.Id())
         })
@@ skipping 693 matching lines @@
         c.Assert(status, Equals, params.StatusStopped)
         c.Assert(info, Equals, "")
 
         err = s.machine.Remove()
         c.Assert(err, IsNil)
         err = s.machine.SetStatus(params.StatusStarted, "not really")
         c.Assert(err, ErrorMatches, `cannot set status of machine "0": not found or not alive`)
         _, _, err = s.machine.Status()
         c.Assert(err, ErrorMatches, "status not found")
 }