Adding more tests and delete fn
diff --git a/openstack/db/v1/instances/fixtures.go b/openstack/db/v1/instances/fixtures.go
index 716fe09..16b4006 100644
--- a/openstack/db/v1/instances/fixtures.go
+++ b/openstack/db/v1/instances/fixtures.go
@@ -146,3 +146,11 @@
 		fmt.Fprintf(w, singleInstanceJson)
 	})
 }
+
+func HandleDeleteInstanceSuccessfully(t *testing.T, id string) {
+	th.Mux.HandleFunc("/instances/"+id, 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)
+	})
+}
diff --git a/openstack/db/v1/instances/requests.go b/openstack/db/v1/instances/requests.go
index d5709b3..6fe423b 100644
--- a/openstack/db/v1/instances/requests.go
+++ b/openstack/db/v1/instances/requests.go
@@ -212,3 +212,17 @@
 
 	return res
 }
+
+func Delete(client *gophercloud.ServiceClient, id string) DeleteResult {
+	var res DeleteResult
+
+	resp, err := perigee.Request("DELETE", resourceURL(client, id), perigee.Options{
+		MoreHeaders: client.AuthenticatedHeaders(),
+		OkCodes:     []int{202},
+	})
+
+	res.Header = resp.HttpResponse.Header
+	res.Err = err
+
+	return res
+}
diff --git a/openstack/db/v1/instances/requests_test.go b/openstack/db/v1/instances/requests_test.go
index 6c0825b..5e5dcaa 100644
--- a/openstack/db/v1/instances/requests_test.go
+++ b/openstack/db/v1/instances/requests_test.go
@@ -120,3 +120,13 @@
 	th.AssertNoErr(t, err)
 	th.AssertDeepEquals(t, instance, expectedInstance)
 }
+
+func TestDeleteInstance(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	HandleDeleteInstanceSuccessfully(t, instanceID)
+
+	res := Delete(fake.ServiceClient(), instanceID)
+	th.AssertNoErr(t, res.Err)
+}
diff --git a/openstack/db/v1/instances/results.go b/openstack/db/v1/instances/results.go
index 562f752..d2ea794 100644
--- a/openstack/db/v1/instances/results.go
+++ b/openstack/db/v1/instances/results.go
@@ -40,6 +40,10 @@
 	commonResult
 }
 
+type DeleteResult struct {
+	gophercloud.ErrResult
+}
+
 func (r commonResult) Extract() (*Instance, error) {
 	if r.Err != nil {
 		return nil, r.Err