implemented a backend-independent emergency notice system

test/emergency_notice_parse_test.dart

@@ -0,0 +1,127 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/api/emergency/emergency_notice.dart';
+
+void main() {
+  group('EmergencyNotice.parse', () {
+    test('parses an active, dismissible notice', () {
+      final notice = EmergencyNotice.parse('''
+---
+active: true
+dismissible: true
+title: Störung
+---
+# Ausfall
+Der Server ist **down**.
+''');
+
+      expect(notice, isNotNull);
+      expect(notice!.dismissible, isTrue);
+      expect(notice.title, 'Störung');
+      expect(notice.body, '# Ausfall\nDer Server ist **down**.');
+    });
+
+    test('parses a full-screen (dismissible: false) notice', () {
+      final notice = EmergencyNotice.parse('''
+---
+active: true
+dismissible: false
+---
+Wichtige Meldung
+''');
+
+      expect(notice, isNotNull);
+      expect(notice!.dismissible, isFalse);
+      expect(notice.title, isNull);
+    });
+
+    test('defaults dismissible to true when absent', () {
+      final notice = EmergencyNotice.parse('''
+---
+active: true
+---
+Body
+''');
+
+      expect(notice!.dismissible, isTrue);
+    });
+
+    test('returns null when active is false', () {
+      expect(
+        EmergencyNotice.parse('---\nactive: false\n---\nBody'),
+        isNull,
+      );
+    });
+
+    test('returns null when active is missing', () {
+      expect(
+        EmergencyNotice.parse('---\ntitle: Hallo\n---\nBody'),
+        isNull,
+      );
+    });
+
+    test('ignores comment lines in the frontmatter', () {
+      final notice = EmergencyNotice.parse('''
+---
+# dismissible: false   <- example config, disabled
+active: true
+dismissible: true
+---
+Body
+''');
+
+      expect(notice, isNotNull);
+      expect(notice!.dismissible, isTrue);
+    });
+
+    test('returns null without a frontmatter', () {
+      expect(EmergencyNotice.parse('Just some **markdown** text'), isNull);
+    });
+
+    test('returns null when the closing delimiter is missing', () {
+      expect(EmergencyNotice.parse('---\nactive: true\nBody'), isNull);
+    });
+
+    test('returns null on empty input', () {
+      expect(EmergencyNotice.parse(''), isNull);
+      expect(EmergencyNotice.parse('   \n  '), isNull);
+    });
+
+    test('returns null when the body is empty', () {
+      expect(EmergencyNotice.parse('---\nactive: true\n---\n   '), isNull);
+    });
+
+    test('preserves the markdown body verbatim', () {
+      final notice = EmergencyNotice.parse('''
+---
+active: true
+---
+# Titel
+
+- Punkt 1
+- Punkt 2
+
+Mehr [Info](https://example.org).
+''');
+
+      expect(
+        notice!.body,
+        '# Titel\n\n- Punkt 1\n- Punkt 2\n\nMehr [Info](https://example.org).',
+      );
+    });
+
+    test('handles CRLF line endings', () {
+      final notice = EmergencyNotice.parse(
+        '---\r\nactive: true\r\n---\r\nHallo\r\n',
+      );
+
+      expect(notice, isNotNull);
+      expect(notice!.body, 'Hallo');
+    });
+
+    test('accepts alternative truthy values for active', () {
+      expect(EmergencyNotice.parse('---\nactive: yes\n---\nB'), isNotNull);
+      expect(EmergencyNotice.parse('---\nactive: 1\n---\nB'), isNotNull);
+      expect(EmergencyNotice.parse('---\nactive: on\n---\nB'), isNotNull);
+    });
+  });
+}