From 6a2c29517828fbb08a94a49c5997644d63a8366e Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 18:16:20 +0100
Subject: [PATCH 01/12] Randomize tests; add `--test-randomize-ordering-seed`
 option to `sz test`.

---
 .../lib/src/commands/src/test_command.dart    | 26 ++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
index 6ba7f7858..9e5ab5355 100644
--- a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
+++ b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
@@ -35,6 +35,15 @@ class TestCommand extends ConcurrentCommand {
       negatable: false,
       abbr: 'u',
     );
+    argParser.addOption(
+      'test-randomize-ordering-seed',
+      help: '''
+Use the specified seed to randomize the execution order of test cases.
+Must be a 32bit unsigned integer or "random".
+If "random", pick a random seed to use.
+If not passed, do not randomize test case execution order.''',
+      defaultsTo: 'random',
+    );
   }
 
   @override
@@ -70,6 +79,8 @@ class TestCommand extends ConcurrentCommand {
       excludeGoldens: argResults!['exclude-goldens'] as bool,
       onlyGoldens: argResults!['only-goldens'] as bool,
       updateGoldens: argResults!['update-goldens'] as bool,
+      testRandomizeOrderingSeed:
+          argResults!['test-randomize-ordering-seed'] as String,
     );
   }
 }
@@ -80,6 +91,7 @@ Future<void> runTests(
   required bool excludeGoldens,
   required bool onlyGoldens,
   required bool updateGoldens,
+  required String testRandomizeOrderingSeed,
 }) {
   if (package.isFlutterPackage) {
     return _runTestsFlutter(
@@ -88,6 +100,7 @@ Future<void> runTests(
       excludeGoldens: excludeGoldens,
       onlyGoldens: onlyGoldens,
       updateGoldens: updateGoldens,
+      testRandomizeOrderingSeed: testRandomizeOrderingSeed,
     );
   } else {
     return _runTestsDart(
@@ -95,6 +108,7 @@ Future<void> runTests(
       package,
       excludeGoldens: excludeGoldens,
       onlyGoldens: onlyGoldens,
+      testRandomizeOrderingSeed: testRandomizeOrderingSeed,
     );
   }
 }
@@ -106,6 +120,7 @@ Future<void> _runTestsDart(
   // don't have golden tests.
   required bool excludeGoldens,
   required bool onlyGoldens,
+  required String testRandomizeOrderingSeed,
 }) async {
   if (onlyGoldens) {
     // Golden tests are only run in the flutter package.
@@ -115,7 +130,13 @@ Future<void> _runTestsDart(
   await getPackage(processRunner, package);
 
   await processRunner.runCommand(
-    ['fvm', 'dart', 'test'],
+    [
+      'fvm',
+      'dart',
+      'test',
+      '--test-randomize-ordering-seed',
+      testRandomizeOrderingSeed
+    ],
     workingDirectory: package.location,
   );
 }
@@ -126,6 +147,7 @@ Future<void> _runTestsFlutter(
   required bool excludeGoldens,
   required bool onlyGoldens,
   required bool updateGoldens,
+  required String testRandomizeOrderingSeed,
 }) async {
   if (onlyGoldens || !excludeGoldens) {
     if (!package.hasGoldenTestsDirectory) {
@@ -137,6 +159,8 @@ Future<void> _runTestsFlutter(
         'fvm',
         'flutter',
         'test',
+        '--test-randomize-ordering-seed',
+        testRandomizeOrderingSeed,
         'test_goldens',
         if (updateGoldens) '--update-goldens',
       ],

From d11af6eac8c730ef1873b92e8f8d58026bd6afb4 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 19:31:08 +0100
Subject: [PATCH 02/12] Add flags to missing callsites

---
 .../sz_repo_cli/lib/src/commands/src/test_command.dart | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
index 9e5ab5355..7df7680d1 100644
--- a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
+++ b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
@@ -174,7 +174,13 @@ Future<void> _runTestsFlutter(
   // couldn't find the "test_goldens" directory.
   if (excludeGoldens || !package.hasGoldenTestsDirectory) {
     await processRunner.runCommand(
-      ['fvm', 'flutter', 'test'],
+      [
+        'fvm',
+        'flutter',
+        'test',
+        '--test-randomize-ordering-seed',
+        testRandomizeOrderingSeed,
+      ],
       workingDirectory: package.location,
     );
     return;
@@ -192,6 +198,8 @@ Future<void> _runTestsFlutter(
       'test_goldens',
       // Directory for unit and widget tests.
       'test',
+      '--test-randomize-ordering-seed',
+      testRandomizeOrderingSeed,
     ],
     workingDirectory: package.location,
   );

From 319d8b48df97db6c2a519c856cd0edbd55aa8ec8 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 20:04:41 +0100
Subject: [PATCH 03/12] Add TEST_RANDOMNESS_SEED dart define

---
 tools/sz_repo_cli/lib/src/commands/src/test_command.dart | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
index 7df7680d1..975f56315 100644
--- a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
+++ b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
@@ -135,7 +135,8 @@ Future<void> _runTestsDart(
       'dart',
       'test',
       '--test-randomize-ordering-seed',
-      testRandomizeOrderingSeed
+      testRandomizeOrderingSeed,
+      '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
     ],
     workingDirectory: package.location,
   );
@@ -161,6 +162,8 @@ Future<void> _runTestsFlutter(
         'test',
         '--test-randomize-ordering-seed',
         testRandomizeOrderingSeed,
+        testRandomizeOrderingSeed,
+        '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
         'test_goldens',
         if (updateGoldens) '--update-goldens',
       ],
@@ -180,6 +183,7 @@ Future<void> _runTestsFlutter(
         'test',
         '--test-randomize-ordering-seed',
         testRandomizeOrderingSeed,
+        '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
       ],
       workingDirectory: package.location,
     );
@@ -200,6 +204,7 @@ Future<void> _runTestsFlutter(
       'test',
       '--test-randomize-ordering-seed',
       testRandomizeOrderingSeed,
+      '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
     ],
     workingDirectory: package.location,
   );

From f2622609acff3a64583a66718a15eff3b4a6a5df Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 20:06:02 +0100
Subject: [PATCH 04/12] Create and use `test_randomness` package.

---
 app/pubspec.lock                              |  9 ++-
 app/pubspec.yaml                              |  3 +-
 app/test/feedback/feedback_bloc_test.dart     |  2 +-
 app/test/feedback/feedback_page_test.dart     |  2 +-
 .../group_join_select_courses_bloc_test.dart  |  2 +-
 app/test/holidays/holiday_bloc_unit_test.dart |  2 +-
 app/test/homework/homework_dialog_test.dart   |  2 +-
 .../teacher_homework_page_widget_test.dart    |  4 +-
 .../school_class_filter_view_test.dart        |  3 +-
 lib/abgabe/abgabe_client_lib/pubspec.lock     |  9 ++-
 lib/abgabe/abgabe_client_lib/pubspec.yaml     |  3 +-
 .../abgabe_client_lib/test/bloc_test.dart     |  2 +-
 .../pubspec.lock                              |  7 ++
 .../lehrer/teacher_homework_page_bloc.dart    |  2 +-
 lib/hausaufgabenheft_logik/pubspec.lock       |  9 ++-
 lib/hausaufgabenheft_logik/pubspec.yaml       |  3 +-
 lib/test_randomness/.gitignore                | 73 +++++++++++++++++++
 lib/test_randomness/.metadata                 | 10 +++
 lib/test_randomness/analysis_options.yaml     |  9 +++
 .../lib/src/test_randomness.dart              | 43 +++++++++++
 lib/test_randomness/lib/test_randomness.dart  |  3 +
 lib/test_randomness/pubspec.lock              | 36 +++++++++
 lib/test_randomness/pubspec.yaml              | 22 ++++++
 23 files changed, 243 insertions(+), 17 deletions(-)
 create mode 100644 lib/test_randomness/.gitignore
 create mode 100644 lib/test_randomness/.metadata
 create mode 100644 lib/test_randomness/analysis_options.yaml
 create mode 100644 lib/test_randomness/lib/src/test_randomness.dart
 create mode 100644 lib/test_randomness/lib/test_randomness.dart
 create mode 100644 lib/test_randomness/pubspec.lock
 create mode 100644 lib/test_randomness/pubspec.yaml

diff --git a/app/pubspec.lock b/app/pubspec.lock
index 5c31cc6c2..aea502645 100644
--- a/app/pubspec.lock
+++ b/app/pubspec.lock
@@ -1793,7 +1793,7 @@ packages:
     source: hosted
     version: "3.2.1"
   random_string:
-    dependency: "direct dev"
+    dependency: transitive
     description:
       name: random_string
       sha256: "03b52435aae8cbdd1056cf91bfc5bf845e9706724dd35ae2e99fa14a1ef79d02"
@@ -2167,6 +2167,13 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.5.9"
+  test_randomness:
+    dependency: "direct dev"
+    description:
+      path: "../lib/test_randomness"
+      relative: true
+    source: path
+    version: "0.0.1"
   time:
     dependency: "direct main"
     description:
diff --git a/app/pubspec.yaml b/app/pubspec.yaml
index c31617835..d7e569d3a 100644
--- a/app/pubspec.yaml
+++ b/app/pubspec.yaml
@@ -193,7 +193,8 @@ dev_dependencies:
   integration_test:
     sdk: flutter
   mockito: ^5.4.4
-  random_string: ^2.0.1
+  test_randomness:
+    path: ../lib/test_randomness
   bloc_test: ^9.1.4
   bloc_presentation_test: ^1.0.0
   path: ^1.8.3
diff --git a/app/test/feedback/feedback_bloc_test.dart b/app/test/feedback/feedback_bloc_test.dart
index fa3944f4b..b007cca44 100644
--- a/app/test/feedback/feedback_bloc_test.dart
+++ b/app/test/feedback/feedback_bloc_test.dart
@@ -9,12 +9,12 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:key_value_store/in_memory_key_value_store.dart';
 import 'package:key_value_store/key_value_store.dart';
-import 'package:random_string/random_string.dart' as random;
 import 'package:sharezone/feedback/src/analytics/feedback_analytics.dart';
 import 'package:sharezone/feedback/src/bloc/feedback_bloc.dart';
 import 'package:sharezone/feedback/src/cache/cooldown_exception.dart';
 import 'package:sharezone/feedback/src/cache/feedback_cache.dart';
 import 'package:sharezone/feedback/src/models/user_feedback.dart';
+import 'package:test_randomness/test_randomness.dart' as random;
 
 import 'mock_feedback_api.dart';
 import 'mock_platform_information_retreiver.dart';
diff --git a/app/test/feedback/feedback_page_test.dart b/app/test/feedback/feedback_page_test.dart
index b672b0861..3350fb1f8 100644
--- a/app/test/feedback/feedback_page_test.dart
+++ b/app/test/feedback/feedback_page_test.dart
@@ -10,12 +10,12 @@ import 'package:bloc_provider/bloc_provider.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:key_value_store/in_memory_key_value_store.dart';
-import 'package:random_string/random_string.dart' as random;
 import 'package:sharezone/feedback/feedback_box_page.dart';
 import 'package:sharezone/feedback/src/bloc/feedback_bloc.dart';
 import 'package:sharezone/feedback/src/cache/cooldown_exception.dart';
 import 'package:sharezone/feedback/src/cache/feedback_cache.dart';
 import 'package:sharezone/feedback/src/models/user_feedback.dart';
+import 'package:test_randomness/test_randomness.dart' as random;
 
 import 'feedback_bloc_test.dart';
 import 'mock_feedback_api.dart';
diff --git a/app/test/groups/group_join_select_courses_bloc_test.dart b/app/test/groups/group_join_select_courses_bloc_test.dart
index f851888ca..1b88c3be6 100644
--- a/app/test/groups/group_join_select_courses_bloc_test.dart
+++ b/app/test/groups/group_join_select_courses_bloc_test.dart
@@ -13,12 +13,12 @@ import 'package:design/design.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:group_domain_models/group_domain_models.dart';
 import 'package:mockito/annotations.dart';
-import 'package:random_string/random_string.dart';
 import 'package:sharezone/groups/group_join/bloc/group_join_bloc.dart';
 import 'package:sharezone/groups/group_join/bloc/group_join_select_courses_bloc.dart';
 import 'package:sharezone/groups/group_join/models/group_info_with_selection_state.dart';
 import 'package:sharezone/groups/group_join/models/group_join_result.dart';
 import 'package:sharezone/util/api/connections_gateway.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 import 'group_join_select_courses_bloc_test.mocks.dart';
 
diff --git a/app/test/holidays/holiday_bloc_unit_test.dart b/app/test/holidays/holiday_bloc_unit_test.dart
index 9b4ad49e5..05379e6a6 100644
--- a/app/test/holidays/holiday_bloc_unit_test.dart
+++ b/app/test/holidays/holiday_bloc_unit_test.dart
@@ -10,7 +10,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:holidays/holidays.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
-import 'package:random_string/random_string.dart' as rdm;
+import 'package:test_randomness/test_randomness.dart' as rdm;
 import 'package:rxdart/subjects.dart';
 import 'package:sharezone/holidays/holiday_bloc.dart';
 import 'package:user/user.dart';
diff --git a/app/test/homework/homework_dialog_test.dart b/app/test/homework/homework_dialog_test.dart
index 6c26ca47b..c889e2fe1 100644
--- a/app/test/homework/homework_dialog_test.dart
+++ b/app/test/homework/homework_dialog_test.dart
@@ -25,7 +25,7 @@ import 'package:group_domain_models/group_domain_models.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
 import 'package:path/path.dart';
-import 'package:random_string/random_string.dart';
+import 'package:test_randomness/test_randomness.dart';
 import 'package:sharezone/homework/homework_dialog/homework_dialog.dart';
 import 'package:sharezone/homework/homework_dialog/homework_dialog_bloc.dart';
 import 'package:sharezone/main/application_bloc.dart';
diff --git a/app/test/homework/teacher/teacher_homework_page_widget_test.dart b/app/test/homework/teacher/teacher_homework_page_widget_test.dart
index 5e5e48515..c1059dbc8 100644
--- a/app/test/homework/teacher/teacher_homework_page_widget_test.dart
+++ b/app/test/homework/teacher/teacher_homework_page_widget_test.dart
@@ -13,13 +13,12 @@ import 'package:analytics/null_analytics_backend.dart';
 import 'package:bloc_provider/bloc_provider.dart';
 import 'package:bloc_provider/multi_bloc_provider.dart';
 import 'package:common_domain_models/common_domain_models.dart';
-import 'package:flutter/material.dart' hide Color;
 import 'package:flutter/material.dart' as flutter show Color;
+import 'package:flutter/material.dart' hide Color;
 import 'package:flutter_test/flutter_test.dart';
 import 'package:hausaufgabenheft_logik/color.dart';
 import 'package:hausaufgabenheft_logik/hausaufgabenheft_logik_lehrer.dart';
 import 'package:provider/provider.dart';
-import 'package:random_string/random_string.dart';
 import 'package:sharezone/homework/shared/shared.dart';
 import 'package:sharezone/homework/teacher/src/teacher_archived_homework_list.dart';
 import 'package:sharezone/homework/teacher/src/teacher_homework_bottom_action_bar.dart';
@@ -27,6 +26,7 @@ import 'package:sharezone/homework/teacher/src/teacher_homework_tile.dart';
 import 'package:sharezone/homework/teacher/src/teacher_open_homework_list.dart';
 import 'package:sharezone/homework/teacher/teacher_homework_page.dart';
 import 'package:sharezone/navigation/logic/navigation_bloc.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 class MockTeacherHomeworkPageBloc extends TeacherHomeworkPageBloc {
   final _queuedStates = Queue<TeacherHomeworkPageState>();
diff --git a/app/test/timetable/school_class_filter_view_test.dart b/app/test/timetable/school_class_filter_view_test.dart
index 938f484d1..75a5528a4 100644
--- a/app/test/timetable/school_class_filter_view_test.dart
+++ b/app/test/timetable/school_class_filter_view_test.dart
@@ -8,9 +8,8 @@
 
 import 'package:common_domain_models/common_domain_models.dart';
 import 'package:flutter_test/flutter_test.dart';
-
-import 'package:random_string/random_string.dart';
 import 'package:sharezone/timetable/timetable_page/school_class_filter/school_class_filter_view.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 void main() {
   group('SchoolClassFilterView', () {
diff --git a/lib/abgabe/abgabe_client_lib/pubspec.lock b/lib/abgabe/abgabe_client_lib/pubspec.lock
index 36fc3e7d2..cd73207ed 100644
--- a/lib/abgabe/abgabe_client_lib/pubspec.lock
+++ b/lib/abgabe/abgabe_client_lib/pubspec.lock
@@ -1081,7 +1081,7 @@ packages:
     source: hosted
     version: "3.2.1"
   random_string:
-    dependency: "direct dev"
+    dependency: transitive
     description:
       name: random_string
       sha256: "03b52435aae8cbdd1056cf91bfc5bf845e9706724dd35ae2e99fa14a1ef79d02"
@@ -1241,6 +1241,13 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.1"
+  test_randomness:
+    dependency: "direct dev"
+    description:
+      path: "../../test_randomness"
+      relative: true
+    source: path
+    version: "0.0.1"
   time:
     dependency: transitive
     description:
diff --git a/lib/abgabe/abgabe_client_lib/pubspec.yaml b/lib/abgabe/abgabe_client_lib/pubspec.yaml
index 6b6432e63..81772cf59 100644
--- a/lib/abgabe/abgabe_client_lib/pubspec.yaml
+++ b/lib/abgabe/abgabe_client_lib/pubspec.yaml
@@ -45,6 +45,7 @@ dev_dependencies:
     sdk: flutter
   async: ^2.4.1
   mockito: ^5.4.4
-  random_string: ^2.0.1
+  test_randomness:
+    path: ../../test_randomness
   sharezone_lints:
     path: ../../sharezone_lints
diff --git a/lib/abgabe/abgabe_client_lib/test/bloc_test.dart b/lib/abgabe/abgabe_client_lib/test/bloc_test.dart
index 5a6121618..e44629070 100644
--- a/lib/abgabe/abgabe_client_lib/test/bloc_test.dart
+++ b/lib/abgabe/abgabe_client_lib/test/bloc_test.dart
@@ -25,7 +25,7 @@ import 'package:common_domain_models/common_domain_models.dart';
 import 'package:files_basics/files_models.dart';
 import 'package:files_basics/local_file.dart';
 
-import 'package:random_string/random_string.dart';
+import 'package:test_randomness/test_randomness.dart';
 import 'package:rxdart/subjects.dart';
 import 'package:flutter_test/flutter_test.dart';
 
diff --git a/lib/firebase_hausaufgabenheft_logik/pubspec.lock b/lib/firebase_hausaufgabenheft_logik/pubspec.lock
index a33cad724..baadf80a5 100644
--- a/lib/firebase_hausaufgabenheft_logik/pubspec.lock
+++ b/lib/firebase_hausaufgabenheft_logik/pubspec.lock
@@ -399,6 +399,13 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.1"
+  test_randomness:
+    dependency: transitive
+    description:
+      path: "../test_randomness"
+      relative: true
+    source: path
+    version: "0.0.1"
   time:
     dependency: "direct main"
     description:
diff --git a/lib/hausaufgabenheft_logik/lib/src/lehrer/teacher_homework_page_bloc.dart b/lib/hausaufgabenheft_logik/lib/src/lehrer/teacher_homework_page_bloc.dart
index 6daf21807..ce0ec760d 100644
--- a/lib/hausaufgabenheft_logik/lib/src/lehrer/teacher_homework_page_bloc.dart
+++ b/lib/hausaufgabenheft_logik/lib/src/lehrer/teacher_homework_page_bloc.dart
@@ -14,7 +14,7 @@ import 'package:common_domain_models/common_domain_models.dart';
 import 'package:hausaufgabenheft_logik/color.dart';
 import 'package:hausaufgabenheft_logik/hausaufgabenheft_logik_lehrer.dart';
 import 'package:meta/meta.dart';
-import 'package:random_string/random_string.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 export 'events.dart';
 export 'states.dart';
diff --git a/lib/hausaufgabenheft_logik/pubspec.lock b/lib/hausaufgabenheft_logik/pubspec.lock
index 9dba12a3b..bbf0aabd0 100644
--- a/lib/hausaufgabenheft_logik/pubspec.lock
+++ b/lib/hausaufgabenheft_logik/pubspec.lock
@@ -295,7 +295,7 @@ packages:
     source: hosted
     version: "2.1.4"
   random_string:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: random_string
       sha256: "03b52435aae8cbdd1056cf91bfc5bf845e9706724dd35ae2e99fa14a1ef79d02"
@@ -437,6 +437,13 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.5.6"
+  test_randomness:
+    dependency: "direct main"
+    description:
+      path: "../test_randomness"
+      relative: true
+    source: path
+    version: "0.0.1"
   typed_data:
     dependency: transitive
     description:
diff --git a/lib/hausaufgabenheft_logik/pubspec.yaml b/lib/hausaufgabenheft_logik/pubspec.yaml
index fe0e71437..e4584efb8 100644
--- a/lib/hausaufgabenheft_logik/pubspec.yaml
+++ b/lib/hausaufgabenheft_logik/pubspec.yaml
@@ -28,7 +28,8 @@ dependencies:
     path: ../bloc_base
   # For teacher fake bloc currently in use (can be removed when bloc is implemented)
   # https://gitlab.com/codingbrain/sharezone/sharezone-app/-/issues/1460
-  random_string: ^2.0.1
+  test_randomness:
+    path: ../test_randomness
 
 dev_dependencies:
   async: ^2.11.0
diff --git a/lib/test_randomness/.gitignore b/lib/test_randomness/.gitignore
new file mode 100644
index 000000000..3132dc5ff
--- /dev/null
+++ b/lib/test_randomness/.gitignore
@@ -0,0 +1,73 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
diff --git a/lib/test_randomness/.metadata b/lib/test_randomness/.metadata
new file mode 100644
index 000000000..f917a52ed
--- /dev/null
+++ b/lib/test_randomness/.metadata
@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: e70236e36ce1d32067dc68eb55519ec3e14b6b01
+  channel: beta
+
+project_type: package
diff --git a/lib/test_randomness/analysis_options.yaml b/lib/test_randomness/analysis_options.yaml
new file mode 100644
index 000000000..1e445c14e
--- /dev/null
+++ b/lib/test_randomness/analysis_options.yaml
@@ -0,0 +1,9 @@
+# Copyright (c) 2023 Sharezone UG (haftungsbeschränkt)
+# Licensed under the EUPL-1.2-or-later.
+#
+# You may obtain a copy of the Licence at:
+# https://joinup.ec.europa.eu/software/page/eupl
+#
+# SPDX-License-Identifier: EUPL-1.2
+
+include: package:sharezone_lints/analysis_options.yaml
diff --git a/lib/test_randomness/lib/src/test_randomness.dart b/lib/test_randomness/lib/src/test_randomness.dart
new file mode 100644
index 000000000..4af8abb51
--- /dev/null
+++ b/lib/test_randomness/lib/src/test_randomness.dart
@@ -0,0 +1,43 @@
+import 'dart:math';
+
+import 'package:random_string/random_string.dart' as lib;
+
+const randomnessSeed =
+    int.fromEnvironment('TEST_RANDOMNESS_SEED', defaultValue: 0);
+
+final szSeededTestRandom = Random(randomnessSeed);
+
+final _randomProvider = lib.CoreRandomProvider.from(szSeededTestRandom);
+
+/// Generates a random integer where [from] <= [to] inclusive
+/// where 0 <= from <= to <= 999999999999999
+int randomBetween(
+  int from,
+  int to,
+) =>
+    lib.randomBetween(from, to, provider: _randomProvider);
+
+/// Generates a random string of [length] with characters
+/// between ascii [from] to [to].
+/// Defaults to characters of ascii '!' to '~'.
+String randomString(
+  int length, {
+  int from = lib.asciiStart,
+  int to = lib.asciiEnd,
+}) =>
+    lib.randomString(length, from: from, to: to, provider: _randomProvider);
+
+/// Generates a random string of [length] with only numeric characters.
+String randomNumeric(int length) =>
+    lib.randomNumeric(length, provider: _randomProvider);
+
+/// Generates a random string of [length] with only alpha characters.
+String randomAlpha(int length) =>
+    lib.randomAlpha(length, provider: _randomProvider);
+
+/// Generates a random string of [length] with alpha-numeric characters.
+String randomAlphaNumeric(int length) =>
+    lib.randomAlphaNumeric(length, provider: _randomProvider);
+
+/// Merge [a] with [b] and shuffle.
+String randomMerge(String a, String b) => lib.randomMerge(a, b);
diff --git a/lib/test_randomness/lib/test_randomness.dart b/lib/test_randomness/lib/test_randomness.dart
new file mode 100644
index 000000000..2d51d909d
--- /dev/null
+++ b/lib/test_randomness/lib/test_randomness.dart
@@ -0,0 +1,3 @@
+library test_randomness;
+
+export 'src/test_randomness.dart';
diff --git a/lib/test_randomness/pubspec.lock b/lib/test_randomness/pubspec.lock
new file mode 100644
index 000000000..a9c652dce
--- /dev/null
+++ b/lib/test_randomness/pubspec.lock
@@ -0,0 +1,36 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  flutter_lints:
+    dependency: transitive
+    description:
+      name: flutter_lints
+      sha256: e2a421b7e59244faef694ba7b30562e489c2b489866e505074eb005cd7060db7
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.1"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: cbf8d4b858bb0134ef3ef87841abdf8d63bfc255c266b7bf6b39daa1085c4290
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  random_string:
+    dependency: "direct main"
+    description:
+      name: random_string
+      sha256: "03b52435aae8cbdd1056cf91bfc5bf845e9706724dd35ae2e99fa14a1ef79d02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.1"
+  sharezone_lints:
+    dependency: "direct dev"
+    description:
+      path: "../sharezone_lints"
+      relative: true
+    source: path
+    version: "1.0.0"
+sdks:
+  dart: ">=3.0.0 <4.0.0"
diff --git a/lib/test_randomness/pubspec.yaml b/lib/test_randomness/pubspec.yaml
new file mode 100644
index 000000000..346934f7a
--- /dev/null
+++ b/lib/test_randomness/pubspec.yaml
@@ -0,0 +1,22 @@
+# Copyright (c) 2022 Sharezone UG (haftungsbeschränkt)
+# Licensed under the EUPL-1.2-or-later.
+#
+# You may obtain a copy of the Licence at:
+# https://joinup.ec.europa.eu/software/page/eupl
+#
+# SPDX-License-Identifier: EUPL-1.2
+
+name: test_randomness
+description: A new Flutter package project.
+version: 0.0.1
+publish_to: none
+
+environment:
+  sdk: ">=2.12.0 <3.0.0"
+
+dependencies:
+  random_string: ^2.3.1
+
+dev_dependencies:
+  sharezone_lints:
+    path: ../sharezone_lints

From f01c02b1b607bb6ec522f4b15b76550ed2b87a55 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 20:14:22 +0100
Subject: [PATCH 05/12] Use `szSeededTestRandom` in tests.

---
 .../dashboard/update_reminder_bloc_test.dart  |  9 ++++---
 app/test/timetable/timetable_bloc_test.dart   |  5 ++--
 ...ard_item_read_by_users_list_page_test.dart |  6 ++---
 .../past_calendrical_events_page_test.dart    | 17 ++++++-------
 .../test/create_homework_util.dart            | 14 ++---------
 .../random_string/random_string_test.dart     | 24 -------------------
 6 files changed, 17 insertions(+), 58 deletions(-)
 delete mode 100644 lib/sharezone_utils/test/random_string/random_string_test.dart

diff --git a/app/test/dashboard/update_reminder_bloc_test.dart b/app/test/dashboard/update_reminder_bloc_test.dart
index 8770e38e2..32d4cd789 100644
--- a/app/test/dashboard/update_reminder_bloc_test.dart
+++ b/app/test/dashboard/update_reminder_bloc_test.dart
@@ -6,12 +6,11 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
-import 'dart:math';
-
 import 'package:flutter_test/flutter_test.dart';
+import 'package:sharezone/changelog/change.dart';
 import 'package:sharezone/dashboard/update_reminder/release.dart';
 import 'package:sharezone/dashboard/update_reminder/update_reminder_bloc.dart';
-import 'package:sharezone/changelog/change.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 void main() {
   group('UpdateReminderBloc', () {
@@ -139,6 +138,6 @@ void main() {
 Release _releaseWith({required String version, DateTime? releaseTime}) {
   return Release(
       version: Version.parse(name: version),
-      releaseDate:
-          releaseTime ?? DateTime(2020, 02, Random.secure().nextInt(25) + 1));
+      releaseDate: releaseTime ??
+          DateTime(2020, 02, szSeededTestRandom.nextInt(25) + 1));
 }
diff --git a/app/test/timetable/timetable_bloc_test.dart b/app/test/timetable/timetable_bloc_test.dart
index e24c8e881..319be828e 100644
--- a/app/test/timetable/timetable_bloc_test.dart
+++ b/app/test/timetable/timetable_bloc_test.dart
@@ -6,8 +6,6 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
-import 'dart:math';
-
 import 'package:common_domain_models/common_domain_models.dart';
 import 'package:date/src/date.dart';
 import 'package:date/weekday.dart';
@@ -19,6 +17,7 @@ import 'package:sharezone/calendrical_events/models/calendrical_event_types.dart
 import 'package:sharezone/timetable/src/bloc/timetable_bloc.dart';
 import 'package:sharezone/timetable/src/models/lesson.dart';
 import 'package:sharezone/timetable/timetable_page/school_class_filter/school_class_filter_view.dart';
+import 'package:test_randomness/test_randomness.dart';
 import 'package:time/time.dart';
 
 import 'mock/mock_course_gateway.dart';
@@ -50,7 +49,7 @@ void main() {
         endTime: Time(hour: 10, minute: 0),
         groupID: groupId,
         groupType: GroupType.course,
-        lessonID: Random().nextInt(200).toString(),
+        lessonID: szSeededTestRandom.nextInt(200).toString(),
         place: "",
         teacher: "",
         weekday: WeekDay.monday,
diff --git a/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart b/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
index 1e4c43949..7e1cbe6f1 100644
--- a/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
+++ b/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
@@ -6,8 +6,6 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
-import 'dart:math';
-
 import 'package:bloc_provider/bloc_provider.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -20,6 +18,7 @@ import 'package:sharezone/blackboard/details/blackboard_item_read_by_users_list/
 import 'package:sharezone/blackboard/details/blackboard_item_read_by_users_list/user_view.dart';
 import 'package:sharezone/sharezone_plus/subscription_service/subscription_service.dart';
 import 'package:sharezone_widgets/sharezone_widgets.dart';
+import 'package:test_randomness/test_randomness.dart';
 import 'package:user/user.dart';
 
 import 'blackboard_item_read_by_users_list_page_test.mocks.dart';
@@ -37,12 +36,11 @@ void main() {
     late MockSubscriptionService subscriptionService;
 
     void setUserViews() {
-      final random = Random(42);
       final dummyUsers = [
         for (var i = 0; i < 10; i++)
           UserView(
             uid: "user$i",
-            hasRead: random.nextBool(),
+            hasRead: szSeededTestRandom.nextBool(),
             typeOfUser: TypeOfUser.student.toReadableString(),
             name: 'User $i',
           )
diff --git a/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart b/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
index bdfe013f8..3706a8c10 100644
--- a/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
+++ b/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
@@ -6,8 +6,6 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
-import 'dart:math';
-
 import 'package:design/design.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -21,6 +19,7 @@ import 'package:sharezone/calendrical_events/provider/past_calendrical_events_pa
 import 'package:sharezone/calendrical_events/provider/past_calendrical_events_page_controller_factory.dart';
 import 'package:sharezone/timetable/src/widgets/events/event_view.dart';
 import 'package:sharezone_widgets/sharezone_widgets.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 import 'past_calendrical_events_page_test.mocks.dart';
 
@@ -32,28 +31,26 @@ import 'past_calendrical_events_page_test.mocks.dart';
 void main() {
   late MockPastCalendricalEventsPageController controller;
   late MockPastCalendricalEventsPageControllerFactory controllerFactory;
-  late Random random;
 
   EventView randomEventView() {
     return EventView(
-      design: Design.random(random),
+      design: Design.random(szSeededTestRandom),
       // Generate random date
       dateText: DateTime(
         2021,
-        random.nextInt(12) + 1,
-        random.nextInt(28) + 1,
+        szSeededTestRandom.nextInt(12) + 1,
+        szSeededTestRandom.nextInt(28) + 1,
       ).toIso8601String(),
       event: MockCalendricalEvent(),
-      groupID: '${random.nextInt(1000)}',
-      courseName: 'Course ${random.nextInt(1000)}',
-      title: 'Title ${random.nextInt(1000)}',
+      groupID: '${szSeededTestRandom.nextInt(1000)}',
+      courseName: 'Course ${szSeededTestRandom.nextInt(1000)}',
+      title: 'Title ${szSeededTestRandom.nextInt(1000)}',
     );
   }
 
   setUp(() {
     controller = MockPastCalendricalEventsPageController();
     controllerFactory = MockPastCalendricalEventsPageControllerFactory();
-    random = Random(42);
 
     when(controllerFactory.create()).thenReturn(controller);
   });
diff --git a/lib/hausaufgabenheft_logik/test/create_homework_util.dart b/lib/hausaufgabenheft_logik/test/create_homework_util.dart
index bb5b9e571..6aa2d2631 100644
--- a/lib/hausaufgabenheft_logik/test/create_homework_util.dart
+++ b/lib/hausaufgabenheft_logik/test/create_homework_util.dart
@@ -6,12 +6,11 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
-import 'dart:math';
-
 import 'package:common_domain_models/common_domain_models.dart';
 import 'package:hausaufgabenheft_logik/src/models/homework/homework.dart';
 import 'package:hausaufgabenheft_logik/src/models/homework/models_used_by_homework.dart';
 import 'package:hausaufgabenheft_logik/src/views/color.dart';
+import 'package:test_randomness/test_randomness.dart';
 
 HomeworkReadModel createHomework(
     {Date todoDate = const Date(day: 1, month: 1, year: 2019),
@@ -22,7 +21,7 @@ HomeworkReadModel createHomework(
     bool withSubmissions = false,
     Color? subjectColor,
     String abbreviation = 'Abb'}) {
-  id = id == 'willBeRandom' ? randomString(5) : id;
+  id = id == 'willBeRandom' ? randomAlphaNumeric(5) : id;
   return HomeworkReadModel(
     id: HomeworkId(id),
     todoDate: todoDate.asDateTime(),
@@ -32,12 +31,3 @@ HomeworkReadModel createHomework(
     status: done ? CompletionStatus.completed : CompletionStatus.open,
   );
 }
-
-String randomString(int length) {
-  var rand = Random();
-  var codeUnits = List.generate(length, (index) {
-    return rand.nextInt(33) + 89;
-  });
-
-  return String.fromCharCodes(codeUnits);
-}
diff --git a/lib/sharezone_utils/test/random_string/random_string_test.dart b/lib/sharezone_utils/test/random_string/random_string_test.dart
deleted file mode 100644
index f152922d5..000000000
--- a/lib/sharezone_utils/test/random_string/random_string_test.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) 2022 Sharezone UG (haftungsbeschränkt)
-// Licensed under the EUPL-1.2-or-later.
-//
-// You may obtain a copy of the Licence at:
-// https://joinup.ec.europa.eu/software/page/eupl
-//
-// SPDX-License-Identifier: EUPL-1.2
-
-import 'package:flutter_test/flutter_test.dart';
-import 'package:sharezone_utils/random_string.dart';
-
-void main() {
-  test('randomString()', () {
-    for (int i = 0; i < 50; i++) {
-      expect(randomString(10), hasLength(10));
-    }
-  });
-
-  test('randomIDString()', () {
-    for (int i = 0; i < 50; i++) {
-      expect(randomIDString(10), hasLength(10));
-    }
-  });
-}

From e806efed22afaede6a104f4e7c890bd9f08c218f Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 20:14:55 +0100
Subject: [PATCH 06/12] Rename to `szTestRandom`

---
 app/test/dashboard/update_reminder_bloc_test.dart    |  4 ++--
 app/test/timetable/timetable_bloc_test.dart          |  2 +-
 ...blackboard_item_read_by_users_list_page_test.dart |  2 +-
 .../page/past_calendrical_events_page_test.dart      | 12 ++++++------
 lib/test_randomness/lib/src/test_randomness.dart     |  4 ++--
 5 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/app/test/dashboard/update_reminder_bloc_test.dart b/app/test/dashboard/update_reminder_bloc_test.dart
index 32d4cd789..3804174db 100644
--- a/app/test/dashboard/update_reminder_bloc_test.dart
+++ b/app/test/dashboard/update_reminder_bloc_test.dart
@@ -138,6 +138,6 @@ void main() {
 Release _releaseWith({required String version, DateTime? releaseTime}) {
   return Release(
       version: Version.parse(name: version),
-      releaseDate: releaseTime ??
-          DateTime(2020, 02, szSeededTestRandom.nextInt(25) + 1));
+      releaseDate:
+          releaseTime ?? DateTime(2020, 02, szTestRandom.nextInt(25) + 1));
 }
diff --git a/app/test/timetable/timetable_bloc_test.dart b/app/test/timetable/timetable_bloc_test.dart
index 319be828e..d1e5c1a3c 100644
--- a/app/test/timetable/timetable_bloc_test.dart
+++ b/app/test/timetable/timetable_bloc_test.dart
@@ -49,7 +49,7 @@ void main() {
         endTime: Time(hour: 10, minute: 0),
         groupID: groupId,
         groupType: GroupType.course,
-        lessonID: szSeededTestRandom.nextInt(200).toString(),
+        lessonID: szTestRandom.nextInt(200).toString(),
         place: "",
         teacher: "",
         weekday: WeekDay.monday,
diff --git a/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart b/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
index 7e1cbe6f1..1d740649e 100644
--- a/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
+++ b/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
@@ -40,7 +40,7 @@ void main() {
         for (var i = 0; i < 10; i++)
           UserView(
             uid: "user$i",
-            hasRead: szSeededTestRandom.nextBool(),
+            hasRead: szTestRandom.nextBool(),
             typeOfUser: TypeOfUser.student.toReadableString(),
             name: 'User $i',
           )
diff --git a/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart b/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
index 3706a8c10..92421579a 100644
--- a/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
+++ b/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
@@ -34,17 +34,17 @@ void main() {
 
   EventView randomEventView() {
     return EventView(
-      design: Design.random(szSeededTestRandom),
+      design: Design.random(szTestRandom),
       // Generate random date
       dateText: DateTime(
         2021,
-        szSeededTestRandom.nextInt(12) + 1,
-        szSeededTestRandom.nextInt(28) + 1,
+        szTestRandom.nextInt(12) + 1,
+        szTestRandom.nextInt(28) + 1,
       ).toIso8601String(),
       event: MockCalendricalEvent(),
-      groupID: '${szSeededTestRandom.nextInt(1000)}',
-      courseName: 'Course ${szSeededTestRandom.nextInt(1000)}',
-      title: 'Title ${szSeededTestRandom.nextInt(1000)}',
+      groupID: '${szTestRandom.nextInt(1000)}',
+      courseName: 'Course ${szTestRandom.nextInt(1000)}',
+      title: 'Title ${szTestRandom.nextInt(1000)}',
     );
   }
 
diff --git a/lib/test_randomness/lib/src/test_randomness.dart b/lib/test_randomness/lib/src/test_randomness.dart
index 4af8abb51..b984bbf5f 100644
--- a/lib/test_randomness/lib/src/test_randomness.dart
+++ b/lib/test_randomness/lib/src/test_randomness.dart
@@ -5,9 +5,9 @@ import 'package:random_string/random_string.dart' as lib;
 const randomnessSeed =
     int.fromEnvironment('TEST_RANDOMNESS_SEED', defaultValue: 0);
 
-final szSeededTestRandom = Random(randomnessSeed);
+final szTestRandom = Random(randomnessSeed);
 
-final _randomProvider = lib.CoreRandomProvider.from(szSeededTestRandom);
+final _randomProvider = lib.CoreRandomProvider.from(szTestRandom);
 
 /// Generates a random integer where [from] <= [to] inclusive
 /// where 0 <= from <= to <= 999999999999999

From 72edc2a81fe641d76f262c00042579e9f13eca59 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 20:16:47 +0100
Subject: [PATCH 07/12] Add docs

---
 lib/test_randomness/lib/src/test_randomness.dart | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/test_randomness/lib/src/test_randomness.dart b/lib/test_randomness/lib/src/test_randomness.dart
index b984bbf5f..c66ef0346 100644
--- a/lib/test_randomness/lib/src/test_randomness.dart
+++ b/lib/test_randomness/lib/src/test_randomness.dart
@@ -2,9 +2,18 @@ import 'dart:math';
 
 import 'package:random_string/random_string.dart' as lib;
 
+/// The seed to use for randomness.
+///
+/// This is used to ensure that tests are deterministic.
+/// The `TEST_RANDOMNESS_SEED` environment variable will be provided when
+/// running `sz test`.
 const randomnessSeed =
     int.fromEnvironment('TEST_RANDOMNESS_SEED', defaultValue: 0);
 
+/// The [Random] that should be used for randomness in tests.
+///
+/// This is a [Random] that is seeded with [randomnessSeed].
+/// This is used to ensure that tests are deterministic.
 final szTestRandom = Random(randomnessSeed);
 
 final _randomProvider = lib.CoreRandomProvider.from(szTestRandom);

From f26812c3af4f5a3e5dd327fe0baec558a3e85bcf Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 20:22:21 +0100
Subject: [PATCH 08/12] Add license header.

---
 lib/test_randomness/lib/src/test_randomness.dart | 8 ++++++++
 lib/test_randomness/lib/test_randomness.dart     | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/lib/test_randomness/lib/src/test_randomness.dart b/lib/test_randomness/lib/src/test_randomness.dart
index c66ef0346..3adfc9fc1 100644
--- a/lib/test_randomness/lib/src/test_randomness.dart
+++ b/lib/test_randomness/lib/src/test_randomness.dart
@@ -1,3 +1,11 @@
+// Copyright (c) 2024 Sharezone UG (haftungsbeschränkt)
+// Licensed under the EUPL-1.2-or-later.
+//
+// You may obtain a copy of the Licence at:
+// https://joinup.ec.europa.eu/software/page/eupl
+//
+// SPDX-License-Identifier: EUPL-1.2
+
 import 'dart:math';
 
 import 'package:random_string/random_string.dart' as lib;
diff --git a/lib/test_randomness/lib/test_randomness.dart b/lib/test_randomness/lib/test_randomness.dart
index 2d51d909d..636fa7b37 100644
--- a/lib/test_randomness/lib/test_randomness.dart
+++ b/lib/test_randomness/lib/test_randomness.dart
@@ -1,3 +1,11 @@
+// Copyright (c) 2024 Sharezone UG (haftungsbeschränkt)
+// Licensed under the EUPL-1.2-or-later.
+//
+// You may obtain a copy of the Licence at:
+// https://joinup.ec.europa.eu/software/page/eupl
+//
+// SPDX-License-Identifier: EUPL-1.2
+
 library test_randomness;
 
 export 'src/test_randomness.dart';

From 98f04c2e46a8c409b5eb9a348824a3c8359d2de5 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 21:47:08 +0100
Subject: [PATCH 09/12] Add `test_randomness` to `licenses_config.yaml`.

---
 licenses_config.yaml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/licenses_config.yaml b/licenses_config.yaml
index dbb07ddba..178e63ea7 100644
--- a/licenses_config.yaml
+++ b/licenses_config.yaml
@@ -85,5 +85,4 @@ packageLicenseOverride:
   url_launcher_extended: EUPL-1.2-or-later
   user: EUPL-1.2-or-later
   util: EUPL-1.2-or-later
-
-
+  test_randomness: EUPL-1.2-or-later
\ No newline at end of file

From 55c128d6432daefd3cc4f7043a39eb80f6f832f0 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Mon, 26 Feb 2024 21:59:17 +0100
Subject: [PATCH 10/12] Use fixed Random in golden tests.

---
 ...board_item_read_by_users_list_page_test.dart |  6 ++++--
 .../page/past_calendrical_events_page_test.dart | 17 ++++++++++-------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart b/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
index 1d740649e..1e4c43949 100644
--- a/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
+++ b/app/test_goldens/blackboard/details/blackboard_item_read_by_users_list_page_test.dart
@@ -6,6 +6,8 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
+import 'dart:math';
+
 import 'package:bloc_provider/bloc_provider.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -18,7 +20,6 @@ import 'package:sharezone/blackboard/details/blackboard_item_read_by_users_list/
 import 'package:sharezone/blackboard/details/blackboard_item_read_by_users_list/user_view.dart';
 import 'package:sharezone/sharezone_plus/subscription_service/subscription_service.dart';
 import 'package:sharezone_widgets/sharezone_widgets.dart';
-import 'package:test_randomness/test_randomness.dart';
 import 'package:user/user.dart';
 
 import 'blackboard_item_read_by_users_list_page_test.mocks.dart';
@@ -36,11 +37,12 @@ void main() {
     late MockSubscriptionService subscriptionService;
 
     void setUserViews() {
+      final random = Random(42);
       final dummyUsers = [
         for (var i = 0; i < 10; i++)
           UserView(
             uid: "user$i",
-            hasRead: szTestRandom.nextBool(),
+            hasRead: random.nextBool(),
             typeOfUser: TypeOfUser.student.toReadableString(),
             name: 'User $i',
           )
diff --git a/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart b/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
index 92421579a..bdfe013f8 100644
--- a/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
+++ b/app/test_goldens/calendrical_events/page/past_calendrical_events_page_test.dart
@@ -6,6 +6,8 @@
 //
 // SPDX-License-Identifier: EUPL-1.2
 
+import 'dart:math';
+
 import 'package:design/design.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -19,7 +21,6 @@ import 'package:sharezone/calendrical_events/provider/past_calendrical_events_pa
 import 'package:sharezone/calendrical_events/provider/past_calendrical_events_page_controller_factory.dart';
 import 'package:sharezone/timetable/src/widgets/events/event_view.dart';
 import 'package:sharezone_widgets/sharezone_widgets.dart';
-import 'package:test_randomness/test_randomness.dart';
 
 import 'past_calendrical_events_page_test.mocks.dart';
 
@@ -31,26 +32,28 @@ import 'past_calendrical_events_page_test.mocks.dart';
 void main() {
   late MockPastCalendricalEventsPageController controller;
   late MockPastCalendricalEventsPageControllerFactory controllerFactory;
+  late Random random;
 
   EventView randomEventView() {
     return EventView(
-      design: Design.random(szTestRandom),
+      design: Design.random(random),
       // Generate random date
       dateText: DateTime(
         2021,
-        szTestRandom.nextInt(12) + 1,
-        szTestRandom.nextInt(28) + 1,
+        random.nextInt(12) + 1,
+        random.nextInt(28) + 1,
       ).toIso8601String(),
       event: MockCalendricalEvent(),
-      groupID: '${szTestRandom.nextInt(1000)}',
-      courseName: 'Course ${szTestRandom.nextInt(1000)}',
-      title: 'Title ${szTestRandom.nextInt(1000)}',
+      groupID: '${random.nextInt(1000)}',
+      courseName: 'Course ${random.nextInt(1000)}',
+      title: 'Title ${random.nextInt(1000)}',
     );
   }
 
   setUp(() {
     controller = MockPastCalendricalEventsPageController();
     controllerFactory = MockPastCalendricalEventsPageControllerFactory();
+    random = Random(42);
 
     when(controllerFactory.create()).thenReturn(controller);
   });

From e39b5c4c7fc909b34cda9368bf1df1d62a28a311 Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Tue, 27 Feb 2024 12:30:02 +0100
Subject: [PATCH 11/12] Fix merge error

---
 tools/sz_repo_cli/lib/src/commands/src/test_command.dart | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
index 975f56315..3096fbc39 100644
--- a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
+++ b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
@@ -162,7 +162,6 @@ Future<void> _runTestsFlutter(
         'test',
         '--test-randomize-ordering-seed',
         testRandomizeOrderingSeed,
-        testRandomizeOrderingSeed,
         '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
         'test_goldens',
         if (updateGoldens) '--update-goldens',

From bf5de40ae7ec8d415ce24ebeab3f15e0d17a3b2b Mon Sep 17 00:00:00 2001
From: Jonas Sander <29028262+Jonas-Sander@users.noreply.github.com>
Date: Thu, 7 Mar 2024 21:29:14 +0100
Subject: [PATCH 12/12] Fix dart test command.

---
 .../lib/src/commands/src/test_command.dart    | 31 +++++++++++++------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
index 3096fbc39..a2718c49c 100644
--- a/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
+++ b/tools/sz_repo_cli/lib/src/commands/src/test_command.dart
@@ -7,6 +7,8 @@
 // SPDX-License-Identifier: EUPL-1.2
 
 import 'dart:async';
+import 'dart:io';
+import 'dart:math';
 
 import 'package:process_runner/process_runner.dart';
 import 'package:sz_repo_cli/src/common/common.dart';
@@ -91,8 +93,14 @@ Future<void> runTests(
   required bool excludeGoldens,
   required bool onlyGoldens,
   required bool updateGoldens,
-  required String testRandomizeOrderingSeed,
+  String testRandomizeOrderingSeed = 'random',
 }) {
+  // Copied from https://github.com/dart-lang/test/blob/ba64bbbaa26f09e139c26f9ad6409995806aac6e/pkgs/test_core/lib/src/runner/configuration/args.dart#L277
+  final seed = testRandomizeOrderingSeed == 'random'
+      ? Random().nextInt(4294967295)
+      : int.parse(testRandomizeOrderingSeed).toUnsigned(32);
+  stdout.writeln('Using seed for test randomization: $seed');
+
   if (package.isFlutterPackage) {
     return _runTestsFlutter(
       processRunner,
@@ -100,7 +108,7 @@ Future<void> runTests(
       excludeGoldens: excludeGoldens,
       onlyGoldens: onlyGoldens,
       updateGoldens: updateGoldens,
-      testRandomizeOrderingSeed: testRandomizeOrderingSeed,
+      testRandomizeOrderingSeed: seed,
     );
   } else {
     return _runTestsDart(
@@ -108,7 +116,7 @@ Future<void> runTests(
       package,
       excludeGoldens: excludeGoldens,
       onlyGoldens: onlyGoldens,
-      testRandomizeOrderingSeed: testRandomizeOrderingSeed,
+      testRandomizeOrderingSeed: seed,
     );
   }
 }
@@ -120,7 +128,7 @@ Future<void> _runTestsDart(
   // don't have golden tests.
   required bool excludeGoldens,
   required bool onlyGoldens,
-  required String testRandomizeOrderingSeed,
+  required int testRandomizeOrderingSeed,
 }) async {
   if (onlyGoldens) {
     // Golden tests are only run in the flutter package.
@@ -133,10 +141,13 @@ Future<void> _runTestsDart(
     [
       'fvm',
       'dart',
+      '--define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
       'test',
       '--test-randomize-ordering-seed',
-      testRandomizeOrderingSeed,
-      '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
+      '$testRandomizeOrderingSeed',
+      // --define only works with this flag, seems to be a bug in Dart.
+      // See: https://github.com/dart-lang/test/issues/1794
+      '--use-data-isolate-strategy',
     ],
     workingDirectory: package.location,
   );
@@ -148,7 +159,7 @@ Future<void> _runTestsFlutter(
   required bool excludeGoldens,
   required bool onlyGoldens,
   required bool updateGoldens,
-  required String testRandomizeOrderingSeed,
+  required int testRandomizeOrderingSeed,
 }) async {
   if (onlyGoldens || !excludeGoldens) {
     if (!package.hasGoldenTestsDirectory) {
@@ -161,7 +172,7 @@ Future<void> _runTestsFlutter(
         'flutter',
         'test',
         '--test-randomize-ordering-seed',
-        testRandomizeOrderingSeed,
+        '$testRandomizeOrderingSeed',
         '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
         'test_goldens',
         if (updateGoldens) '--update-goldens',
@@ -181,7 +192,7 @@ Future<void> _runTestsFlutter(
         'flutter',
         'test',
         '--test-randomize-ordering-seed',
-        testRandomizeOrderingSeed,
+        '$testRandomizeOrderingSeed',
         '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
       ],
       workingDirectory: package.location,
@@ -202,7 +213,7 @@ Future<void> _runTestsFlutter(
       // Directory for unit and widget tests.
       'test',
       '--test-randomize-ordering-seed',
-      testRandomizeOrderingSeed,
+      '$testRandomizeOrderingSeed',
       '--dart-define=TEST_RANDOMNESS_SEED=$testRandomizeOrderingSeed',
     ],
     workingDirectory: package.location,