iosWebViewFix/example/integration_test/in_app_webview/get_content_height.dart

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:flutter_test/flutter_test.dart';

import '../constants.dart';

void getContentHeight() {
  final shouldSkip = kIsWeb
      ? false
      : ![
          TargetPlatform.android,
          TargetPlatform.iOS,
          TargetPlatform.macOS,
        ].contains(defaultTargetPlatform);

  var url = !kIsWeb ? TEST_CROSS_PLATFORM_URL_1 : TEST_WEB_PLATFORM_URL_1;

  testWidgets('getContentHeight', (WidgetTester tester) async {
    final Completer controllerCompleter = Completer<InAppWebViewController>();
    final Completer<void> pageLoaded = Completer<void>();

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: InAppWebView(
          key: GlobalKey(),
          initialUrlRequest: URLRequest(url: url),
          onWebViewCreated: (controller) {
            controllerCompleter.complete(controller);
          },
          onLoadStop: (controller, url) {
            pageLoaded.complete();
          },
        ),
      ),
    );

    final InAppWebViewController controller = await controllerCompleter.future;
    await pageLoaded.future;

    await tester.pump();

    final contentHeight = await controller.getContentHeight();
    expect(contentHeight, isNonZero);
    expect(contentHeight, isPositive);
  }, skip: shouldSkip);
}