Use delegated fixtures in Rackspace identity.
diff --git a/rackspace/identity/v2/extensions/delegate_test.go b/rackspace/identity/v2/extensions/delegate_test.go
index ae5a91b..e30f794 100644
--- a/rackspace/identity/v2/extensions/delegate_test.go
+++ b/rackspace/identity/v2/extensions/delegate_test.go
@@ -1,12 +1,9 @@
 package extensions
 
 import (
-	"fmt"
-	"net/http"
 	"testing"
 
 	common "github.com/rackspace/gophercloud/openstack/common/extensions"
-	os "github.com/rackspace/gophercloud/openstack/identity/v2/extensions"
 	"github.com/rackspace/gophercloud/pagination"
 	th "github.com/rackspace/gophercloud/testhelper"
 	fake "github.com/rackspace/gophercloud/testhelper/client"
@@ -15,28 +12,7 @@
 func TestList(t *testing.T) {
 	th.SetupHTTP()
 	defer th.TeardownHTTP()
-
-	th.Mux.HandleFunc("/extensions", func(w http.ResponseWriter, r *http.Request) {
-		th.TestMethod(t, r, "GET")
-		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
-
-		w.Header().Add("Content-Type", "application/json")
-
-		fmt.Fprintf(w, `
-{
-  "extensions": [
-    {
-      "updated": "2013-01-20T00:00:00-00:00",
-      "name": "Neutron Service Type Management",
-      "links": [],
-      "namespace": "http://docs.openstack.org/ext/neutron/service-type/api/v1.0",
-      "alias": "service-type",
-      "description": "API for retrieving service providers for Neutron advanced services"
-    }
-  ]
-}
-    `)
-	})
+	common.HandleListExtensionsSuccessfully(t)
 
 	count := 0
 
@@ -44,21 +20,7 @@
 		count++
 		actual, err := ExtractExtensions(page)
 		th.AssertNoErr(t, err)
-
-		expected := []os.Extension{
-			os.Extension{
-				Extension: common.Extension{
-					Updated:     "2013-01-20T00:00:00-00:00",
-					Name:        "Neutron Service Type Management",
-					Links:       []interface{}{},
-					Namespace:   "http://docs.openstack.org/ext/neutron/service-type/api/v1.0",
-					Alias:       "service-type",
-					Description: "API for retrieving service providers for Neutron advanced services",
-				},
-			},
-		}
-
-		th.AssertDeepEquals(t, expected, actual)
+		th.AssertDeepEquals(t, common.ExpectedExtensions, actual)
 
 		return true, nil
 	})
@@ -69,34 +31,9 @@
 func TestGet(t *testing.T) {
 	th.SetupHTTP()
 	defer th.TeardownHTTP()
+	common.HandleGetExtensionSuccessfully(t)
 
-	th.Mux.HandleFunc("/extensions/agent", func(w http.ResponseWriter, r *http.Request) {
-		th.TestMethod(t, r, "GET")
-		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
-
-		w.Header().Add("Content-Type", "application/json")
-		w.WriteHeader(http.StatusOK)
-
-		fmt.Fprintf(w, `
-{
-    "extension": {
-        "updated": "2013-02-03T10:00:00-00:00",
-        "name": "agent",
-        "links": [],
-        "namespace": "http://docs.openstack.org/ext/agent/api/v2.0",
-        "alias": "agent",
-        "description": "The agent management extension."
-    }
-}
-    `)
-
-		ext, err := Get(fake.ServiceClient(), "agent").Extract()
-		th.AssertNoErr(t, err)
-
-		th.AssertEquals(t, ext.Updated, "2013-02-03T10:00:00-00:00")
-		th.AssertEquals(t, ext.Name, "agent")
-		th.AssertEquals(t, ext.Namespace, "http://docs.openstack.org/ext/agent/api/v2.0")
-		th.AssertEquals(t, ext.Alias, "agent")
-		th.AssertEquals(t, ext.Description, "The agent management extension.")
-	})
+	actual, err := Get(fake.ServiceClient(), "agent").Extract()
+	th.AssertNoErr(t, err)
+	th.CheckDeepEquals(t, common.SingleExtension, actual)
 }