✅ Add test

Author: AlexV525

packages/command/.gitignore

@@ -0,0 +1 @@
+test/lib/gen/

packages/command/test/deprecated_configs.yaml

@@ -0,0 +1,9 @@
+flutter:
+  assets:
+    - assets/
+
+flutter_gen:
+  assets:
+    enabled: true
+    style: snake-case
+    package_parameter_enabled: true

packages/command/test/flutter_gen_command_test.dart

@@ -1,5 +1,6 @@
 import 'dart:io' show Platform;
 
+import 'package:flutter_gen_core/generators/generator_helper.dart' as helper;
 import 'package:flutter_gen_core/version.gen.dart';
 import 'package:test/test.dart';
 import 'package:test_process/test_process.dart';
@@ -52,7 +53,7 @@ void main() {
     await process.shouldExit(0);
   });
 
-  test('Execute wrong argments with fluttergen --wrong', () async {
+  test('Execute wrong arguments with fluttergen --wrong', () async {
     var process = await TestProcess.start(
       'dart',
       ['bin/flutter_gen_command.dart', '--wrong'],
@@ -67,4 +68,20 @@ void main() {
     );
     await process.shouldExit(0);
   });
+
+  test('Execute deprecated config with fluttergen', () async {
+    final process = await TestProcess.start(
+      'dart',
+      [
+        'bin/flutter_gen_command.dart',
+        '--config',
+        'test/deprecated_configs.yaml',
+      ],
+    );
+    final errors = (await process.stderr.rest.toList()).join('\n');
+    expect(errors, contains(helper.sWarning));
+    expect(errors, contains('style'));
+    expect(errors, contains('package_parameter_enabled'));
+    await process.shouldExit(0);
+  });
 }