func (s *BlockDevicesSuite) TestSetMachineBlockDevicesUpdates(c *gc.C) {
sda := state.BlockDeviceInfo{DeviceName: "sda"}
sdb := state.BlockDeviceInfo{DeviceName: "sdb"}
err := s.machine.SetMachineBlockDevices(sda, sdb)
c.Assert(err, jc.ErrorIsNil)
s.assertBlockDevices(c, s.machine.MachineTag(), []state.BlockDeviceInfo{sda, sdb})
sdb.Label = "root"
err = s.machine.SetMachineBlockDevices(sdb)
c.Assert(err, jc.ErrorIsNil)
s.assertBlockDevices(c, s.machine.MachineTag(), []state.BlockDeviceInfo{sdb})
// If a device is attached, unattached, then attached again,
// then it gets a new name.
sdb.Label = "" // Label should be reset.
sdb.FilesystemType = "ext4"
err = s.machine.SetMachineBlockDevices(sda, sdb)
c.Assert(err, jc.ErrorIsNil)
s.assertBlockDevices(c, s.machine.MachineTag(), []state.BlockDeviceInfo{
sda,
sdb,
})
}
