packages/flutter/test/widgets/editable_text_utils.dart

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

RenderEditable findRenderEditable(WidgetTester tester) {
  final RenderObject root = tester.renderObject(find.byType(EditableText));
  expect(root, isNotNull);

  RenderEditable renderEditable;
  void recursiveFinder(RenderObject child) {
    if (child is RenderEditable) {
      renderEditable = child;
      return;
    }
    child.visitChildren(recursiveFinder);
  }
  root.visitChildren(recursiveFinder);
  expect(renderEditable, isNotNull);
  return renderEditable;
}