Add ResetAPIKey.
diff --git a/rackspace/identity/v2/users/fixtures.go b/rackspace/identity/v2/users/fixtures.go
index e843966..973f39e 100644
--- a/rackspace/identity/v2/users/fixtures.go
+++ b/rackspace/identity/v2/users/fixtures.go
@@ -136,3 +136,19 @@
 		w.WriteHeader(http.StatusNoContent)
 	})
 }
+
+func mockResetAPIKey(t *testing.T) {
+	th.Mux.HandleFunc("/users/99/OS-KSADM/credentials/RAX-KSKEY:apiKeyCredentials/RAX-AUTH/reset", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "POST")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintf(w, `
+{
+    "RAX-KSKEY:apiKeyCredentials": {
+        "username": "joesmith",
+        "apiKey": "mooH1eiLahd5ahYood7r"
+    }
+}`)
+	})
+}