environs/config: more restrictive New

provider/maas/config_test.go

 // Copyright 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 
 package maas
 
 import (
         gc "launchpad.net/gocheck"
 
         "launchpad.net/juju-core/environs"
         "launchpad.net/juju-core/testing"
 )
 
 type configSuite struct {
         testing.LoggingSuite
 }
 
 var _ = gc.Suite(&configSuite{})
 
 // copyAttrs copies values from src into dest.  If src contains a key that was
 // already in dest, its value in dest will still be updated to the one from
 // src.
 func copyAttrs(src, dest map[string]interface{}) {
         for k, v := range src {
                 dest[k] = v
         }
 }
 
 // newConfig creates a MAAS environment config from attributes.
 func newConfig(values map[string]interface{}) (*maasEnvironConfig, error) {
-        attrs := testing.FakeConfig.Merge(testing.Attrs{
+        attrs := testing.FakeConfig().Merge(testing.Attrs{
                 "name": "testenv",
                 "type": "maas",
         }).Merge(values)
         env, err := environs.NewFromAttrs(attrs)
         if err != nil {
                 return nil, err
         }
         return env.(*maasEnviron).ecfg(), nil
 }
 
@@ skipping 42 matching lines @@
         c.Assert(err, gc.IsNil)
         newName := oldCfg.Name() + "-but-different"
         newCfg, err := oldCfg.Apply(map[string]interface{}{"name": newName})
         c.Assert(err, gc.IsNil)
 
         _, err = maasEnvironProvider{}.Validate(newCfg, oldCfg.Config)
 
         c.Assert(err, gc.NotNil)
         c.Check(err, gc.ErrorMatches, ".*cannot change name.*")
 }