test(web): added tests for web icon generator

test/templates.dart

@@ -18,6 +18,17 @@ flutter_icons:
 
 const flavorFLIConfigTemplate = fliConfigTemplate;
 
+const fliWebConfig = r'''
+flutter_icons:
+  web:
+    generate: true
+    image_path: "app_icon.png" # filepath
+    background_color: "#0175C2" # hex_color
+    theme_color: "#0175C2" # hex_color
+    apple_mobile_web_app_title: "demo"
+    apple_mobile_web_app_status_bar_style: "hex_color"
+''';
+
 const invlaidfliConfigTemplate = r'''
 # flutter_icons
 android: true

test/web/web_icon_generator_test.dart

@@ -0,0 +1,67 @@
+import 'dart:io';
+
+import 'package:flutter_launcher_icons/abs/icon_generator.dart';
+import 'package:flutter_launcher_icons/flutter_launcher_icons_config.dart';
+import 'package:flutter_launcher_icons/logger.dart';
+import 'package:flutter_launcher_icons/web/web_icon_generator.dart';
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
+
+import '../templates.dart' as templates;
+
+void main() {
+  group('WebIconGenerator', () {
+    late IconGeneratorContext context;
+    late IconGenerator generator;
+    late FlutterLauncherIconsConfig config;
+    late String prefixPath;
+    final assetPath = path.join(Directory.current.path, 'test', 'assets');
+
+    setUp(() async {
+      final imageFile = File(path.join(assetPath, 'app_icon.png'));
+      expect(imageFile.existsSync(), isTrue);
+      await d.dir('fli_test', [
+        d.dir('web', [
+          d.dir('icons'),
+          d.file('index.html', templates.webIndexTemplate),
+          d.file('manifest.json', templates.webManifestTemplate),
+        ]),
+        d.file('flutter_launcher_icons.yaml', templates.fliWebConfig),
+        d.file('pubspec.yaml', templates.pubspecTemplate),
+        d.file('app_icon.png', imageFile.readAsBytesSync()),
+      ]).create();
+      prefixPath = path.join(d.sandbox, 'fli_test');
+      config = FlutterLauncherIconsConfig.loadConfigFromPath('flutter_launcher_icons.yaml', prefixPath)!;
+      context = IconGeneratorContext(config: config, prefixPath: prefixPath, logger: FLILogger(false));
+      generator = WebIconGenerator(context);
+    });
+
+    // end to end test
+    test('should generate valid icons', () async {
+      expect(generator.validateRequirments(), isTrue);
+      generator.createIcons();
+      await expectLater(
+        d.dir('fli_test', [
+          d.dir('web', [
+            d.dir('icons', [
+              // this icons get created in fs
+              d.file('Icon-192.png', anything),
+              d.file('Icon-512.png', anything),
+              d.file('Icon-maskable-192.png', anything),
+              d.file('Icon-maskable-512.png', anything),
+            ]),
+            // this favicon get created in fs
+            d.file('favicon.png', anything),
+            d.file('index.html', anything),
+            // this manifest.json get updated in fs
+            d.file('manifest.json', anything),
+          ]),
+          d.file('flutter_launcher_icons.yaml', anything),
+          d.file('pubspec.yaml', templates.pubspecTemplate)
+        ]).validate(),
+        completes,
+      );
+    });
+  });
+}