environs: add the facility to query all running instances

environs/jujutest/livetests.go

 package jujutest
 
 import (
         "fmt"
         . "launchpad.net/gocheck"
         "launchpad.net/juju-core/juju/environs"
         "launchpad.net/juju-core/juju/state"
         "time"
 )
 
 // TestStartStop is similar to Tests.TestStartStop except
 // that it does not assume a pristine environment.
 func (t *LiveTests) TestStartStop(c *C) {
         insts, err := t.Env.Instances(nil)
         c.Assert(err, IsNil)
         c.Check(insts, HasLen, 0)
 
         inst, err := t.Env.StartInstance(0, InvalidStateInfo)
         c.Assert(err, IsNil)
         c.Assert(inst, NotNil)
         id0 := inst.Id()
 
         insts, err = t.Env.Instances([]string{id0, id0})
         c.Assert(err, IsNil)
         c.Assert(insts, HasLen, 2)
         c.Assert(insts[0].Id(), Equals, id0)
         c.Assert(insts[1].Id(), Equals, id0)
 
+        insts, err = t.Env.AllInstances()
+        c.Assert(err, IsNil)
+        c.Assert(insts, HasLen, 1)
+        c.Assert(insts[0].Id(), Equals, id0)
+
         dns, err := inst.WaitDNSName()
         c.Assert(err, IsNil)
         c.Assert(dns, Not(Equals), "")
 
         insts, err = t.Env.Instances([]string{id0, ""})
         c.Assert(err, Equals, environs.ErrPartialInstances)
         c.Assert(insts, HasLen, 2)
         c.Check(insts[0].Id(), Equals, id0)
         c.Check(insts[1], IsNil)
 
@@ skipping 68 matching lines @@
                 c.Errorf("file name %q not found in file list %q", name, names)
         }
 
         err = storage.Remove(name)
         c.Check(err, IsNil)
         checkFileDoesNotExist(c, storage, name)
         // removing a file that does not exist should not be an error.
         err = storage.Remove(name)
         c.Check(err, IsNil)
 }