fix: detect all main function variations in code samples

dartdoc_test/lib/src/logger.dart

@@ -90,13 +90,24 @@ class Summary {
 
   /// Get summery from [DartdocAnalysisResult].
   factory Summary.from(List<DartdocAnalysisResult> results) {
-    final isFailed = results.indexWhere((r) => r.errors.isNotEmpty) != -1;
-    final errors =
-        results.expand((r) => r.errors).where((e) => e.commentSpan != null);
+    // Get all errors from all results
+    final allErrors = results.expand((r) => r.errors);
+
+    // Check if there are any errors at all
+    final isFailed = allErrors.isNotEmpty;
+
+    // Count only errors that have a comment span (user-facing errors)
+    final errorsWithSpan = allErrors.where((e) => e.commentSpan != null);
+
+    // Get all code samples
     final samples = results.map((r) => r.file);
+
+    // Get unique file paths
     final files =
         samples.map((s) => s.sample.comment.span.sourceUrl?.path).toSet();
-    return Summary(isFailed, errors.length, samples.length, files.length);
+
+    return Summary(
+        isFailed, errorsWithSpan.length, samples.length, files.length);
   }
 
   @override

dartdoc_test/lib/src/model.dart

@@ -93,7 +93,16 @@ final class DocumentationCodeSample {
   });
 
   /// Whether the code sample has a `main` function.
-  bool get hasMain => code.contains('void main()');
+  /// Detects variations like:
+  /// - void main()
+  /// - Future<void> main()
+  /// - Future main()
+  /// - main()
+  bool get hasMain {
+    // Check for any main function declaration
+    // Matches: main(), void main(), Future<void> main(), Future main()
+    return RegExp(r'\b(Future<void>|Future|void)?\s*main\s*\(').hasMatch(code);
+  }
 
   /// Create a sample by wrapping the code with a main function and imports.
   String wrappedCode(Directory testDir) {

dartdoc_test/lib/src/resource.dart

@@ -24,7 +24,7 @@ import 'package:source_span/source_span.dart';
 import 'dartdoc_test.dart';
 import 'model.dart';
 
-const _testPath = '.dart_tool/dartdoc_test';
+final _testPath = p.join('.dart_tool', 'dartdoc_test');
 
 final _currentDir = Directory.current;