move unit tests into 'testing' directories
diff --git a/openstack/cdn/v1/serviceassets/testing/fixtures.go b/openstack/cdn/v1/serviceassets/testing/fixtures.go
new file mode 100644
index 0000000..3172d30
--- /dev/null
+++ b/openstack/cdn/v1/serviceassets/testing/fixtures.go
@@ -0,0 +1,19 @@
+package testing
+
+import (
+	"net/http"
+	"testing"
+
+	th "github.com/gophercloud/gophercloud/testhelper"
+	fake "github.com/gophercloud/gophercloud/testhelper/client"
+)
+
+// HandleDeleteCDNAssetSuccessfully creates an HTTP handler at `/services/{id}/assets` on the test handler mux
+// that responds with a `Delete` response.
+func HandleDeleteCDNAssetSuccessfully(t *testing.T) {
+	th.Mux.HandleFunc("/services/96737ae3-cfc1-4c72-be88-5d0e7cc9a3f0/assets", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "DELETE")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+		w.WriteHeader(http.StatusAccepted)
+	})
+}