allow token/tenantID authentication
diff --git a/acceptance/rackspace/identity/v2/tokens_test.go b/acceptance/rackspace/identity/v2/tokens_test.go
new file mode 100644
index 0000000..95ee7e6
--- /dev/null
+++ b/acceptance/rackspace/identity/v2/tokens_test.go
@@ -0,0 +1,61 @@
+// +build acceptance
+
+package v2
+
+import (
+	"os"
+	"testing"
+
+	"github.com/rackspace/gophercloud"
+	"github.com/rackspace/gophercloud/acceptance/tools"
+	"github.com/rackspace/gophercloud/rackspace"
+	"github.com/rackspace/gophercloud/rackspace/identity/v2/tokens"
+	th "github.com/rackspace/gophercloud/testhelper"
+)
+
+func rackspaceAuthOptions(t *testing.T) gophercloud.AuthOptions {
+	// Obtain credentials from the environment.
+	options, err := rackspace.AuthOptionsFromEnv()
+	th.AssertNoErr(t, err)
+	options = tools.OnlyRS(options)
+
+	if options.Username == "" {
+		t.Fatal("Please provide a Rackspace username as RS_USERNAME.")
+	}
+	if options.APIKey == "" {
+		t.Fatal("Please provide a Rackspace API key as RS_API_KEY.")
+	}
+
+	return options
+}
+
+func createClient(t *testing.T, auth bool) *gophercloud.ServiceClient {
+	ao := rackspaceAuthOptions(t)
+
+	provider, err := rackspace.NewClient(ao.IdentityEndpoint)
+	th.AssertNoErr(t, err)
+
+	if auth {
+		err = rackspace.Authenticate(provider, ao)
+		th.AssertNoErr(t, err)
+	}
+
+	return rackspace.NewIdentityV2(provider)
+}
+
+func TestTokenAuth(t *testing.T) {
+	authedClient := createClient(t, true)
+	token := authedClient.TokenID
+
+	tenantID := os.Getenv("RS_TENANT_ID")
+	if tenantID == "" {
+		t.Skip("You must set RS_TENANT_ID environment variable to run this test")
+	}
+
+	authOpts := tokens.AuthOptions{}
+	authOpts.TenantID = tenantID
+	authOpts.Token = token
+
+	_, err := tokens.Create(authedClient, authOpts).ExtractToken()
+	th.AssertNoErr(t, err)
+}