Gateway: Potential fix for URL()

gateway/gateway.go

@@ -58,10 +58,12 @@ type SessionStartLimit struct {
 func URL() (string, error) {
 	var g BotData
 
-	return g.URL, httputil.NewClient().RequestJSON(
-		&g, "GET",
-		EndpointGateway,
-	)
+	c := httputil.NewClient()
+	if err := c.RequestJSON(&g, "GET", EndpointGateway); err != nil {
+		return "", err
+	}
+
+	return g.URL, nil
 }
 
 // BotURL fetches the Gateway URL along with extra metadata. The token

gateway/integration_test.go

@@ -21,6 +21,21 @@ func init() {
 	}
 }
 
+func TestURL(t *testing.T) {
+	u, err := URL()
+	if err != nil {
+		t.Fatal("failed to get gateway URL:", err)
+	}
+
+	if u == "" {
+		t.Fatal("gateway URL is empty")
+	}
+
+	if !strings.HasPrefix(u, "wss://") {
+		t.Fatal("gatewayURL is invalid:", u)
+	}
+}
+
 func TestInvalidToken(t *testing.T) {
 	g, err := NewGateway("bad token")
 	if err != nil {