fix: prefer-match-file-name (#437)

* [Rule change] prefer-match-file-name: ignore characters after the first dot

* Formated code

Author: Konoshenko Vlad

lib/src/analyzers/lint_analyzer/rules/rules_list/prefer_match_file_name/prefer_match_file_name.dart

@@ -34,7 +34,9 @@ class PreferMatchFileName extends CommonRule {
         className.replaceAll(_onlySymbolsRegex, '').toLowerCase();
 
     return classNameFormatted ==
-        basenameWithoutExtension(path)
+        basename(path)
+            .split('.')
+            .first
             .replaceAll(_onlySymbolsRegex, '')
             .toLowerCase();
   }

test/analyzers/lint_analyzer/rules/rules_list/prefer_match_file_name/examples/some_widget.codegen.dart

@@ -0,0 +1,6 @@
+class SomeWidget extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    //...
+  }
+}

test/analyzers/lint_analyzer/rules/rules_list/prefer_match_file_name/prefer_match_file_name_test.dart

@@ -12,6 +12,7 @@ const _withIssue = '$_examplePath/example_with_issue.dart';
 const _emptyFile = '$_examplePath/empty_file.dart';
 const _privateClass = '$_examplePath/private_class.dart';
 const _multiClass = '$_examplePath/multiple_classes_example.dart';
+const _codegenFile = '$_examplePath/some_widget.codegen.dart';
 
 void main() {
   group('PreferMatchFileName', () {
@@ -75,5 +76,12 @@ void main() {
 
       RuleTestHelper.verifyNoIssues(issues);
     });
+
+    test('reports no issues for codegen file', () async {
+      final unit = await RuleTestHelper.resolveFromFile(_codegenFile);
+      final issues = PreferMatchFileName().check(unit);
+
+      RuleTestHelper.verifyNoIssues(issues);
+    });
   });
 }