feat: polish phase 7 forms and schedules

test/group_form_logic_test.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ignis_app/features/groups/group_form_logic.dart';
+import 'package:ignis_app/models/ignis_group.dart';
+
+void main() {
+  test('slugify transliterates russian names into stable ids', () {
+    expect(slugifyGroupId('Спальня родителей'), 'spalnya-roditeley');
+    expect(slugifyGroupId('  Kitchen + Hall  '), 'kitchen-hall');
+  });
+
+  test('group id validation rejects duplicates and invalid chars', () {
+    const existing = [IgnisGroup(id: 'bedroom', name: 'Спальня')];
+
+    expect(validateGroupId('', existing), 'Укажите ID группы');
+    expect(
+      validateGroupId('спальня', existing),
+      'Только латиница, цифры, "-" и "_"',
+    );
+    expect(
+      validateGroupId('bedroom', existing),
+      'Группа с таким ID уже существует',
+    );
+    expect(validateGroupId('hall_way', existing), isNull);
+  });
+
+  test('membership conflicts are detected by device ids', () {
+    const groups = [
+      IgnisGroup(id: 'bedroom', name: 'Спальня', macs: ['AA:BB', 'CC:DD']),
+      IgnisGroup(id: 'kitchen', name: 'Кухня', macs: ['EE:FF']),
+    ];
+
+    final conflicts = findGroupMembershipConflicts({'EE:FF', '11:22'}, groups);
+
+    expect(conflicts, hasLength(1));
+    expect(conflicts.single.id, 'kitchen');
+  });
+}

test/schedule_form_logic_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:ignis_app/features/schedules/schedule_form_logic.dart';
+
+void main() {
+  test('default once time rounds forward and stays in future', () {
+    final now = DateTime(2026, 5, 1, 10, 2);
+
+    final result = defaultOnceScheduleTime(now: now);
+
+    expect(result, DateTime(2026, 5, 1, 14, 5));
+    expect(result.isAfter(now), isTrue);
+  });
+
+  test('once validation rejects missing and past dates', () {
+    final now = DateTime(2026, 5, 1, 10, 0);
+
+    expect(validateOnceSchedule(null, now: now), 'Выберите дату и время');
+    expect(
+      validateOnceSchedule(now.add(const Duration(seconds: 30)), now: now),
+      'Нужна дата хотя бы на минуту вперёд',
+    );
+    expect(
+      validateOnceSchedule(now.add(const Duration(minutes: 2)), now: now),
+      isNull,
+    );
+  });
+
+  test('cron weekday serialization and descriptions stay human readable', () {
+    expect(serializeCronWeekdays({0, 1, 2, 3, 4, 5, 6}), '*');
+    expect(serializeCronWeekdays({1, 5, 0}), '0,1,5');
+    expect(describeCronWeekdays({1, 2, 3, 4, 5}), 'Пн, Вт, Ср, Чт, Пт');
+    expect(describeCronWeekdaysExpression('*'), 'каждый день');
+    expect(describeCronWeekdaysExpression('1,5,0'), 'Пн, Пт, Вс');
+  });
+
+  test('format runAt converts utc timestamp to local label', () {
+    final label = formatRunAtLabel('2026-05-01T12:30:00Z');
+
+    expect(label, isNotEmpty);
+    expect(label.contains('2026'), isTrue);
+    expect(label.contains('12:30') || label.contains('19:30'), isTrue);
+  });
+}