feature: test builder

example/lib/widgets/utils/bottom/catalog/test/fab_widget.test.dart

@@ -1,6 +1,6 @@
 /// AUTOGENERATED FILE.
 ///
-/// Use this file for testing the widget FabWidgetPreview
+/// Use this file to test the widget FabWidgetPreview
 ///
 
 import 'package:catalog/catalog.dart';

lib/src/bin/preview_builder/preview_builder.dart

@@ -160,6 +160,78 @@ $clazz build$clazz(Dummy dummy) {
   await file.writeAsString(content);
 }
 
+Future<void> generateTest(
+  String srcPath,
+  String className,
+  String prefix,
+) async {
+  var clazz = className.replaceAll('()', '');
+
+  String fileName = srcPath.split('/').last;
+  String name = fileName.split('.').first;
+  String dirPath = srcPath.replaceAll(fileName, '');
+  String testPath = '${dirPath}catalog/test/';
+
+  await Directory(testPath).create(recursive: true);
+
+  String testFile = '$testPath$name.test.dart';
+  File file = File(testFile);
+
+  if (await file.exists()) {
+    print(
+        '🧪 👌 Test file already exist for $clazz - ${clazz}Test ($testFile)');
+    return;
+  }
+
+  print('🧪 Generating test for $clazz - ${clazz}Test ($testFile)');
+
+  var content = '''
+/// AUTOGENERATED FILE.
+///
+/// Use this file to test the widget $clazz
+///
+
+import 'package:catalog/catalog.dart';
+
+import '../dummy/$name.dummy.dart';
+import '../preview/$name.$prefix.dart';
+
+class ${clazz}Test {
+  void main() {
+    group(
+      '$clazz - Tests',
+      () {
+        testWidgets(
+          'Lorem text not found',
+          (tester) async {
+            final dummy = ${clazz}Dummy().dummies.first;
+            final widget = build$clazz(dummy);
+            await tester.test(widget);
+
+            expect(find.text('lorem ipsu'), findsNothing);
+          },
+        );
+
+        testWidgets(
+          'Other lorem text not found',
+          (tester) async {
+            final dummy = ${clazz}Dummy().dummies.first;
+            final widget = build$clazz(dummy);
+            await tester.test(widget);
+
+            expect(find.text('ipsu lorem'), findsNothing);
+          },
+        );
+      },
+    );
+  }
+}
+
+    ''';
+
+  await file.writeAsString(content);
+}
+
 String dummyWidgetBuilder(String clazz) {
   return '''
   PreviewBoundary(

lib/src/bin/tasks/main_task.dart

@@ -2,10 +2,12 @@ import 'base/base_task.dart';
 import 'tasks/catalog_task.dart';
 import 'tasks/format_task.dart';
 import 'tasks/preview_task.dart';
+import 'tasks/test_task.dart';
 
 class MainTask extends BaseTask {
   final tasks = [
     PreviewTask(),
+    TestTask(),
     CatalogTask(),
     FormatTask(),
   ];
@@ -20,6 +22,6 @@ class MainTask extends BaseTask {
         print(e);
       }
     }
-    print('\n Previews and catalog generated \n');
+    print('\n Previews, tests and catalog generated \n');
   }
 }

lib/src/bin/tasks/preview_task.dart

@@ -1,10 +1,12 @@
 import 'base/base_task.dart';
 import 'tasks/format_task.dart';
 import 'tasks/preview_task.dart' as preview;
+import 'tasks/test_task.dart';
 
 class PreviewTask extends BaseTask {
   final tasks = [
     preview.PreviewTask(),
+    TestTask(),
     FormatTask(),
   ];
 
@@ -18,6 +20,6 @@ class PreviewTask extends BaseTask {
         print(e);
       }
     }
-    print('\n Previews generated \n');
+    print('\n Previews and tests generated \n');
   }
 }

lib/src/bin/tasks/tasks/test_task.dart

@@ -0,0 +1,58 @@
+import 'dart:io';
+
+import '../../preview_builder/preview_builder.dart';
+import '../../utils/configuration.dart';
+import '../base/base_task.dart';
+
+class TestTask extends BaseTask {
+  @override
+  Future<void> work(List<String> args) async {
+    final base = args.isEmpty ? '' : '${args.first}/';
+
+    var config = loadConfigFile(base);
+
+    final prefixValue = config['prefix'] ?? 'preview';
+
+    final dir = Directory('./$base${config['base']}');
+    await dir.create(recursive: true);
+
+    final dirOutPut = Directory('./$base${config['base']}/${config['output']}');
+    await dirOutPut.create(recursive: true);
+
+    final List<FileSystemEntity> entities =
+        await dir.list(recursive: true).toList();
+
+    final files = <FileSystemEntity>[];
+
+    for (FileSystemEntity fileSystemEntity in entities) {
+      try {
+        if (fileSystemEntity is Directory) continue;
+        if (fileSystemEntity.path.endsWith('.DS_Store')) continue;
+        final File file = File(fileSystemEntity.path);
+        if (file.path.contains('.$prefixValue.')) continue;
+        final content = await file.readAsString();
+        if (content.contains('@Preview(')) {
+          files.add(fileSystemEntity);
+        }
+      } catch (e) {
+        print(e);
+      }
+    }
+
+    for (FileSystemEntity fileSystemEntity in files) {
+      final File file = File(fileSystemEntity.path);
+      var preview = await previewOnFile(base, config, file.path);
+      var previewAnnotation = await findPreviewAnnotation(file.path);
+      if (previewAnnotation == null) continue;
+      var className = await findClassName(file.path);
+      if (className == null) continue;
+      if (preview == null) continue;
+
+      await generateTest(
+        file.path,
+        className,
+        prefixValue,
+      );
+    }
+  }
+}