Split app into flavors in Dart

lib/app_config.dart

@@ -0,0 +1,5 @@
+class AppConfig {
+  AppConfig(this.flavor);
+
+  final String flavor;
+}

lib/main.dart → lib/main_common.dart

@@ -1,8 +1,13 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_flavors/app_config.dart';
 
-void main() => runApp(MyApp());
+void mainCommon(AppConfig config) => runApp(MyApp(config));
 
 class MyApp extends StatelessWidget {
+  MyApp(this.config);
+
+  final AppConfig config;
+
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
@@ -20,7 +25,7 @@ class MyApp extends StatelessWidget {
         // is not restarted.
         primarySwatch: Colors.blue,
       ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
+      home: MyHomePage(title: 'Flutter: ${config.flavor}'),
     );
   }
 }

lib/main_dev.dart

@@ -0,0 +1,10 @@
+import 'dart:async';
+
+import 'package:flutter_flavors/app_config.dart';
+import 'package:flutter_flavors/main_common.dart';
+
+Future<void> main() async {
+  final config = AppConfig('dev');
+
+  mainCommon(config);
+}

lib/main_prod.dart

@@ -0,0 +1,10 @@
+import 'dart:async';
+
+import 'package:flutter_flavors/app_config.dart';
+import 'package:flutter_flavors/main_common.dart';
+
+Future<void> main() async {
+  final config = AppConfig('prod');
+
+  mainCommon(config);
+}

lib/main_tst.dart

@@ -0,0 +1,10 @@
+import 'dart:async';
+
+import 'package:flutter_flavors/app_config.dart';
+import 'package:flutter_flavors/main_common.dart';
+
+Future<void> main() async {
+  final config = AppConfig('tst');
+
+  mainCommon(config);
+}

test/widget_test.dart

@@ -6,14 +6,14 @@
 // tree, read text, and verify that the values of widget properties are correct.
 
 import 'package:flutter/material.dart';
+import 'package:flutter_flavors/app_config.dart';
+import 'package:flutter_flavors/main_common.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import 'package:flutter_flavors/main.dart';
-
 void main() {
   testWidgets('Counter increments smoke test', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(MyApp());
+    await tester.pumpWidget(MyApp(AppConfig('test')));
 
     // Verify that our counter starts at 0.
     expect(find.text('0'), findsOneWidget);