fix: Align contact sorting labels #0

test/models/channel_test.dart

@@ -0,0 +1,35 @@
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/models/channel.dart';
+
+void main() {
+  test('hash channels expose deterministic psk_base64', () {
+    final channel = Channel.create(index: 3, name: '#ops');
+
+    expect(channel.isHashChannel, isTrue);
+    expect(channel.pskBase64, 'O2RN43fDLHh5NgWiWqkVvw==');
+    expect(
+      Channel.pskBase64ForHashChannelName('#ops'),
+      'O2RN43fDLHh5NgWiWqkVvw==',
+    );
+  });
+
+  test('normal channels reject derived hashtag psk export helper', () {
+    expect(
+      () => Channel.pskBase64ForHashChannelName('ops'),
+      throwsArgumentError,
+    );
+  });
+
+  test('normal channels still expose their stored psk_base64', () {
+    final channel = Channel.create(
+      index: 4,
+      name: 'ops',
+      explicitSecret: Uint8List.fromList(List<int>.generate(16, (i) => i)),
+    );
+
+    expect(channel.isHashChannel, isFalse);
+    expect(channel.pskBase64, 'AAECAwQFBgcICQoLDA0ODw==');
+  });
+}