simplex-chat/packages/simplex_app/test/widget_test.dart

// This is a basic Flutter widget test.
//
// To perform an interaction with a widget in your test, use the WidgetTester
// utility that Flutter provides. For example, you can send tap and scroll
// gestures. You can also use WidgetTester to find child widgets in the widget
// tree, read text, and verify that the values of widget properties are correct.

import "package:flutter/material.dart";
import "package:flutter_test/flutter_test.dart";

import "package:simplex_app/main.dart";

void main() {
  testWidgets("Counter increments smoke test", (WidgetTester tester) async {
    // Build our app and trigger a frame.
    await tester.pumpWidget(const MyApp());

    // Verify that our counter starts at 0.
    expect(find.text("0"), findsOneWidget);
    expect(find.text("1"), findsNothing);

    // Tap the '+' icon and trigger a frame.
    await tester.tap(find.byIcon(Icons.add));
    await tester.pump();

    // Verify that our counter has incremented.
    expect(find.text("0"), findsNothing);
    expect(find.text("1"), findsOneWidget);
  });
}