Fixup URL assembly, add simple test
diff --git a/openstack/compute/v2/images/requests_test.go b/openstack/compute/v2/images/requests_test.go
index 9a05f97..93a97bd 100644
--- a/openstack/compute/v2/images/requests_test.go
+++ b/openstack/compute/v2/images/requests_test.go
@@ -173,3 +173,19 @@
 	th.AssertNoErr(t, err)
 	th.CheckEquals(t, expected, actual)
 }
+
+// Test Image delete
+func TestDeleteImage(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	th.Mux.HandleFunc("/images/12345678", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "DELETE")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	res := Delete(fake.ServiceClient(), "12345678")
+	th.AssertNoErr(t, res.Err)
+}