add check on err != nil (#194)

Author: chemidy

firebase_test.go

@@ -73,6 +73,10 @@ func TestClientOptions(t *testing.T) {
 	defer ts.Close()
 
 	b, err := mockServiceAcct(ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	config, err := google.JWTConfigFromJSON(b)
 	if err != nil {
 		t.Fatal(err)

snippets/messaging.go

@@ -30,6 +30,9 @@ func sendToToken(app *firebase.App) {
 	// Obtain a messaging.Client from the App.
 	ctx := context.Background()
 	client, err := app.Messaging(ctx)
+	if err != nil {
+		log.Fatalf("error getting Messaging client: %v\n", err)
+	}
 
 	// This registration token comes from the client FCM SDKs.
 	registrationToken := "YOUR_REGISTRATION_TOKEN"