Clarify ServiceClient and ProviderClient.
diff --git a/openstack/client_test.go b/openstack/client_test.go
new file mode 100644
index 0000000..8068554
--- /dev/null
+++ b/openstack/client_test.go
@@ -0,0 +1,12 @@
+package openstack
+
+import (
+	"testing"
+
+	"github.com/rackspace/gophercloud/testhelper"
+)
+
+func TestAuthenticate(t *testing.T) {
+	testhelper.SetupHTTP()
+	defer testhelper.TeardownHTTP()
+}