1 files changed, 67 insertions, 0 deletions
diff --git a/test/log_service_test.dart b/test/log_service_test.dart
new file mode 100644
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--- /dev/null
+++ b/test/log_service_test.dart
@@ -0,0 +1,67 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:path/path.dart' as p;
+import 'package:quicklog/services/log_service.dart';
+
+void main() {
+  group('logEntry', () {
+    late Directory tmp;
+
+    setUp(() async {
+      tmp = await Directory.systemTemp.createTemp('ql-test-');
+    });
+
+    tearDown(() async {
+      if (await tmp.exists()) await tmp.delete(recursive: true);
+    });
+
+    test('writes a file with ql-YYMMDD-HHMMSS.md filename pattern', () async {
+      final f = await logEntry(tmp.path, 'hello');
+      expect(p.basename(f.path), matches(RegExp(r'^ql-\d{6}-\d{6}\.md$')));
+      expect(await f.readAsString(), 'hello');
+    });
+
+    test('preserves arbitrary content including unicode and newlines', () async {
+      const text = 'line 1\nläine 2\n第三行';
+      final f = await logEntry(tmp.path, text);
+      expect(await f.readAsString(), text);
+    });
+
+    test('uses the provided timestamp when given', () async {
+      final ts = DateTime(2026, 5, 7, 14, 30, 45);
+      final f = await logEntry(tmp.path, 'x', now: ts);
+      expect(p.basename(f.path), 'ql-260507-143045.md');
+    });
+
+    test('throws on a non-existent directory', () async {
+      final bad = p.join(tmp.path, 'does', 'not', 'exist');
+      expect(() => logEntry(bad, 'x'), throwsA(isA<FileSystemException>()));
+    });
+  });
+
+  group('listEntries', () {
+    late Directory tmp;
+    setUp(() async => tmp = await Directory.systemTemp.createTemp('ql-list-'));
+    tearDown(() async {
+      if (await tmp.exists()) await tmp.delete(recursive: true);
+    });
+
+    test('returns entries sorted newest first and skips malformed names', () async {
+      await File(p.join(tmp.path, 'ql-260101-000000.md')).writeAsString('a');
+      await File(p.join(tmp.path, 'ql-260102-000000.md')).writeAsString('b');
+      await File(p.join(tmp.path, 'random.md')).writeAsString('skip');
+      await File(p.join(tmp.path, 'ql-bad-format.md')).writeAsString('skip');
+
+      final entries = await listEntries(tmp.path);
+      expect(entries.length, 2);
+      expect(p.basename(entries[0].file.path), 'ql-260102-000000.md');
+      expect(p.basename(entries[1].file.path), 'ql-260101-000000.md');
+    });
+
+    test('returns empty list for missing directory', () async {
+      final entries = await listEntries(p.join(tmp.path, 'nope'));
+      expect(entries, isEmpty);
+    });
+  });
+}