environs: add the facility to query all running instances

environs/jujutest/tests.go

 package jujutest
 
 import (
         "bytes"
         "io"
         "io/ioutil"
         . "launchpad.net/gocheck"
         "launchpad.net/juju-core/juju/environs"
         "net/http"
         "time"
@@ skipping 15 matching lines @@
         c.Assert(err, IsNil)
         c.Assert(inst1, NotNil)
         id1 := inst1.Id()
 
         insts, err = e.Instances([]string{id0, id1})
         c.Assert(err, IsNil)
         c.Assert(insts, HasLen, 2)
         c.Assert(insts[0].Id(), Equals, id0)
         c.Assert(insts[1].Id(), Equals, id1)
 
+        // order of results is not specified
+        insts, err = e.AllInstances()
+        c.Assert(err, IsNil)
+        c.Assert(insts, HasLen, 2)
+        c.Assert(insts[0].Id(), Not(Equals), insts[1].Id())
+
         err = e.StopInstances([]environs.Instance{inst0})
         c.Assert(err, IsNil)
 
         insts, err = e.Instances([]string{id0, id1})
         c.Assert(err, Equals, environs.ErrPartialInstances)
         c.Assert(insts[0], IsNil)
         c.Assert(insts[1].Id(), Equals, id1)
+
+        insts, err = e.AllInstances()
+        c.Assert(err, IsNil)
+        c.Assert(insts[0].Id(), Equals, id1)
 }
 
 func (t *Tests) TestBootstrap(c *C) {
         // TODO tests for Bootstrap(true)
         e := t.Open(c)
         err := e.Bootstrap(false)
         c.Assert(err, IsNil)
 
         info, err := e.StateInfo()
         c.Assert(info, NotNil)
@@ skipping 120 matching lines @@
                 c.Logf("get retrying after earlier get succeeded. *sigh*.")
                 time.Sleep(1e9)
         }
         c.Assert(err, IsNil)
         data, err = ioutil.ReadAll(resp.Body)
         c.Assert(err, IsNil)
         defer resp.Body.Close()
         c.Assert(resp.StatusCode, Equals, 200, Commentf("error response: %s", data))
         c.Check(data, DeepEquals, contents)
 }