Remote sync of webdav

test/vin_parser_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:fuel_tax_tracker/services/vin_parser.dart';
+
+void main() {
+  group('VinParser', () {
+    test('parses a bare 17-character VIN', () {
+      const text = '''
+        VEHICLE IDENTIFICATION NUMBER
+        1HGCM82633A004352
+        MFD BY HONDA MFG CO
+      ''';
+
+      expect(VinParser.parse(text), '1HGCM82633A004352');
+    });
+
+    test('prefers a "VIN:" labeled match over another candidate elsewhere', () {
+      const text = '''
+        PART NO 4F2CZ58899BA12345
+        VIN: 1HGCM82633A004352
+      ''';
+
+      expect(VinParser.parse(text), '1HGCM82633A004352');
+    });
+
+    test('normalizes to uppercase', () {
+      expect(VinParser.parse('vin: 1hgcm82633a004352'), '1HGCM82633A004352');
+    });
+
+    test('does not match a run containing I, O, or Q (never valid in a real VIN)', () {
+      // Same length (17) but contains an "O" partway through, so no
+      // 17-character eligible-charset run exists anywhere in it.
+      expect(VinParser.parse('1HGCM82633AOO4352'), isNull);
+    });
+
+    test('does not match a 16-character (too short) run', () {
+      expect(VinParser.parse('1HGCM82633A00435'), isNull);
+    });
+
+    test('does not match an 18-character (too long) run', () {
+      expect(VinParser.parse('1HGCM82633A0043521'), isNull);
+    });
+
+    test('returns null when nothing matches', () {
+      expect(VinParser.parse('THANK YOU FOR YOUR PURCHASE'), isNull);
+    });
+  });
+}