feat: comprehensive Alchemist visual regression test suite

dart_test.yaml

@@ -0,0 +1,17 @@
+# Test configuration for cristalyse
+
+# This file defines tags used by the test suite
+
+
+
+tags:
+
+  # Golden tests use Alchemist for visual regression testing
+
+  # Run with: flutter test --tags golden
+
+  # Skip with: flutter test --exclude-tags golden
+
+  golden:
+
+    description: Visual regression tests using golden file screenshots

pubspec.yaml

@@ -61,4 +61,8 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^6.0.0
+  flutter_lints: ^6.0.0
+  alchemist: ^0.13.0
+
+flutter:
+  uses-material-design: true

test/flutter_test_config.dart

@@ -0,0 +1,21 @@
+import 'dart:async';
+
+import 'package:alchemist/alchemist.dart';
+import 'package:flutter/material.dart';
+
+Future<void> testExecutable(FutureOr<void> Function() testMain) async {
+  const isRunningInCi = bool.fromEnvironment('CI', defaultValue: false);
+
+  return AlchemistConfig.runWithConfig(
+    config: AlchemistConfig(
+      theme: ThemeData(fontFamily: 'Roboto'),
+      platformGoldensConfig: const PlatformGoldensConfig(
+        enabled: !isRunningInCi,
+      ),
+      ciGoldensConfig: const CiGoldensConfig(
+        enabled: isRunningInCi,
+      ),
+    ),
+    run: testMain,
+  );
+}