Adding list secgroups
diff --git a/openstack/compute/v2/extensions/secgroups/fixtures.go b/openstack/compute/v2/extensions/secgroups/fixtures.go
new file mode 100644
index 0000000..d87e76b
--- /dev/null
+++ b/openstack/compute/v2/extensions/secgroups/fixtures.go
@@ -0,0 +1,34 @@
+package secgroups
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+
+	th "github.com/rackspace/gophercloud/testhelper"
+	fake "github.com/rackspace/gophercloud/testhelper/client"
+)
+
+func mockListGroupsResponse(t *testing.T) {
+	th.Mux.HandleFunc("/os-security-groups", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "GET")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+
+		fmt.Fprintf(w, `
+{
+  "security_groups": [
+    {
+      "description": "default",
+      "id": "b0e0d7dd-2ca4-49a9-ba82-c44a148b66a5",
+      "name": "default",
+      "rules": [],
+      "tenant_id": "openstack"
+    }
+  ]
+}
+`)
+	})
+}