Making dart:ui_web Compile in Flutter Tests — The Conditional Import Pattern

Making dart:ui_web Compile in Flutter Tests The Problem When embedding YouTube iframes in Flutter Web, you use dart:ui_web and package:web : import 'dart:ui_web' as ui_web ; import 'package:web/web.dart' as web ; // in initState ui_web . platformViewRegistry . registerViewFactory ( 'youtube- $id ' , ( int viewId ) { final iframe = web . HTMLIFrameElement (). . src = embedUrl ; return iframe ; }, ); Works on Flutter Web. Breaks in tests: Compilation failed for test/main_test.dart: lib/pages/philo