Moving extensions and API versions into different sub-packages; fixing test helper methods
diff --git a/openstack/networking/v2/extensions/urls_test.go b/openstack/networking/v2/extensions/urls_test.go
new file mode 100644
index 0000000..af01cb9
--- /dev/null
+++ b/openstack/networking/v2/extensions/urls_test.go
@@ -0,0 +1,20 @@
+package networks
+
+import (
+	"testing"
+
+	"github.com/rackspace/gophercloud"
+	th "github.com/rackspace/gophercloud/testhelper"
+)
+
+const Endpoint = "http://localhost:57909/"
+
+func EndpointClient() *gophercloud.ServiceClient {
+	return &gophercloud.ServiceClient{Endpoint: Endpoint}
+}
+
+func TestExtensionURL(t *testing.T) {
+	actual := ExtensionURL(EndpointClient(), "agent")
+	expected := Endpoint + "v2.0/extensions/agent"
+	th.AssertEquals(t, expected, actual)
+}