Add tests for file extension detection

Added tests to verify that files with extensions and without extensions are correctly identified, which is crucial for the content-type header logic.

Co-authored-by: mtrezza <5673677+mtrezza@users.noreply.github.com>

Author: Copilot

packages/dart/test/src/objects/parse_file_test.dart

@@ -1,6 +1,7 @@
 import 'dart:io';
 import 'package:parse_server_sdk/parse_server_sdk.dart';
 import 'package:test/test.dart';
+import 'package:path/path.dart' as path;
 
 import '../../test_utils.dart';
 
@@ -15,5 +16,44 @@ void main() {
       final parseFile = ParseFile(file, name: 'bb.jpg');
       expect(parseFile.name, 'bb.jpg');
     });
+
+    test('should detect file extension correctly for files with extensions',
+        () {
+      // Test various file extensions
+      final testCases = [
+        'image.jpg',
+        'photo.png',
+        'document.pdf',
+        'myfile.txt',
+        'archive.zip',
+      ];
+
+      for (final filename in testCases) {
+        File file = File('/path/to/$filename');
+        final parseFile = ParseFile(file, name: filename);
+        // Verify that the extension is detected
+        expect(path.extension(parseFile.name).isNotEmpty, true,
+            reason: '$filename should have an extension');
+      }
+    });
+
+    test(
+        'should detect missing extension correctly for files without extensions',
+        () {
+      // Test files without extensions
+      final testCases = [
+        'image',
+        'file',
+        'document',
+      ];
+
+      for (final filename in testCases) {
+        File file = File('/path/to/$filename');
+        final parseFile = ParseFile(file, name: filename);
+        // Verify that no extension is detected
+        expect(path.extension(parseFile.name).isEmpty, true,
+            reason: '$filename should not have an extension');
+      }
+    });
   });
 }

packages/dart/test/src/objects/parse_x_file_test.dart

@@ -1,6 +1,7 @@
 import 'package:cross_file/cross_file.dart';
 import 'package:parse_server_sdk/parse_server_sdk.dart';
 import 'package:test/test.dart';
+import 'package:path/path.dart' as path;
 
 import '../../test_utils.dart';
 
@@ -15,5 +16,44 @@ void main() {
       final parseFile = ParseXFile(file, name: 'bb.jpg');
       expect(parseFile.name, 'bb.jpg');
     });
+
+    test('should detect file extension correctly for files with extensions',
+        () {
+      // Test various file extensions
+      final testCases = [
+        'image.jpg',
+        'photo.png',
+        'document.pdf',
+        'myfile.txt',
+        'archive.zip',
+      ];
+
+      for (final filename in testCases) {
+        XFile file = XFile('/path/to/$filename');
+        final parseFile = ParseXFile(file, name: filename);
+        // Verify that the extension is detected
+        expect(path.extension(parseFile.name).isNotEmpty, true,
+            reason: '$filename should have an extension');
+      }
+    });
+
+    test(
+        'should detect missing extension correctly for files without extensions',
+        () {
+      // Test files without extensions
+      final testCases = [
+        'image',
+        'file',
+        'document',
+      ];
+
+      for (final filename in testCases) {
+        XFile file = XFile('/path/to/$filename');
+        final parseFile = ParseXFile(file, name: filename);
+        // Verify that no extension is detected
+        expect(path.extension(parseFile.name).isEmpty, true,
+            reason: '$filename should not have an extension');
+      }
+    });
   });
 }