added guardian login with views for their assigned childs

test/access/user_role_test.dart

@@ -0,0 +1,28 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/access/user_role.dart';
+import 'package:marianum_mobile/state/app/modules/capabilities/bloc/capabilities_state.dart';
+
+void main() {
+  test('parses the server wire values', () {
+    expect(UserRole.parse('STUDENT'), UserRole.student);
+    expect(UserRole.parse('TEACHER'), UserRole.teacher);
+    expect(UserRole.parse('STAFF'), UserRole.staff);
+    expect(UserRole.parse('PARENT'), UserRole.parent);
+  });
+
+  test('missing or unknown values are unknown, never an error', () {
+    expect(UserRole.parse(null), UserRole.unknown);
+    expect(UserRole.parse('ALUMNUS'), UserRole.unknown);
+  });
+
+  test('hydrated capability states from older versions stay readable', () {
+    final state = CapabilitiesState.fromJson({
+      'viewForeignTimetables': true,
+      'pushNotifications': true,
+      'userType': 'TEACHER',
+      'loaded': true,
+    });
+    expect(state.role, UserRole.teacher);
+    expect(CapabilitiesState.fromJson({}).role, UserRole.unknown);
+  });
+}