diff --git a/.githooks/pre-commit b/.githooks/pre-commit
index 11599b2..c1c2b45 100755
--- a/.githooks/pre-commit
+++ b/.githooks/pre-commit
@@ -1 +1,2 @@
-exec flutter analyze
\ No newline at end of file
+flutter analyze
+flutter test
\ No newline at end of file
diff --git a/lib/screens/new_project/participant_tile.dart b/lib/screens/new_project/participant_tile.dart
index f99e7b7..a8d8a3f 100644
--- a/lib/screens/new_project/participant_tile.dart
+++ b/lib/screens/new_project/participant_tile.dart
@@ -5,6 +5,8 @@ import '../../models/participant.dart';
 import '../../models/project.dart';
 import '../../utils/helper/confirm_box.dart';
 
+// TODO: make immutable
+// ignore: must_be_immutable
 class ParticipantTile extends StatefulWidget {
   ParticipantTile({
     super.key,
diff --git a/lib/screens/project/expenses/new_entry.dart b/lib/screens/project/expenses/new_entry.dart
index cca9ae6..7da2d3b 100644
--- a/lib/screens/project/expenses/new_entry.dart
+++ b/lib/screens/project/expenses/new_entry.dart
@@ -10,7 +10,7 @@ import '../../../models/item.dart';
 import '../../../models/participant.dart';
 import '../../../models/project.dart';
 import '../../../widgets/new_screen.dart';
-import '../../../utils/ext/text_input_formatter.dart';
+import '../../../utils/helper/text_input_formatter.dart';
 import '../../../utils/ext/time.dart';
 import 'entry_table.dart';
 
diff --git a/lib/utils/ext/string.dart b/lib/utils/ext/string.dart
index d846636..457d01d 100644
--- a/lib/utils/ext/string.dart
+++ b/lib/utils/ext/string.dart
@@ -1,9 +1,11 @@
 extension StringExtension on String {
   String capitalize() {
+    if (length == 0) return '';
     return '${this[0].toUpperCase()}${substring(1).toLowerCase()}';
   }
 
   String firstCapitalize() {
+    if (length == 0) return '';
     return '${this[0].toUpperCase()}${substring(1)}';
   }
 }
diff --git a/lib/utils/ext/time.dart b/lib/utils/ext/time.dart
index d3a8ceb..bdbf779 100644
--- a/lib/utils/ext/time.dart
+++ b/lib/utils/ext/time.dart
@@ -66,7 +66,7 @@ extension DateExtension on DateTime {
 
   int daysTo(DateTime to) {
     DateTime from = DateTime(year, month, day);
-    to = DateTime(from.year, from.month, from.day);
+    to = DateTime(to.year, to.month, to.day);
     return (to.difference(from).inHours / 24).round();
   }
 
diff --git a/lib/utils/ext/text_input_formatter.dart b/lib/utils/helper/text_input_formatter.dart
similarity index 73%
rename from lib/utils/ext/text_input_formatter.dart
rename to lib/utils/helper/text_input_formatter.dart
index e5d1e68..39be1fc 100644
--- a/lib/utils/ext/text_input_formatter.dart
+++ b/lib/utils/helper/text_input_formatter.dart
@@ -1,3 +1,4 @@
+
 import 'dart:math';
 
 import 'package:flutter/services.dart';
@@ -15,20 +16,6 @@ class DecimalTextInputFormatter extends TextInputFormatter {
     TextSelection newSelection = newValue.selection;
     String truncated = newValue.text;
 
-    // try {
-    //   return TextEditingValue(
-    //     text: double.parse(newValue.text).toStringAsPrecision(2),
-    //     selection: newSelection,
-    //     composing: TextRange.empty,
-    //   );
-    // } catch (e) {
-    //   return TextEditingValue(
-    //     text: oldValue.text,
-    //     selection: oldValue.selection,
-    //     composing: oldValue.composing,
-    //   );
-    // }
-
     if (truncated == '.') {
       truncated = '0.';
       newSelection = newValue.selection.copyWith(
diff --git a/pubspec.lock b/pubspec.lock
index 55db101..eb89ab8 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1,6 +1,22 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: ae92f5d747aee634b87f89d9946000c2de774be1d6ac3e58268224348cd0101a
+      url: "https://pub.dev"
+    source: hosted
+    version: "61.0.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: ea3d8652bda62982addfd92fdc2d0214e5f82e43325104990d4f4c4a2a313562
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.13.0"
   app_links:
     dependency: "direct main"
     description:
@@ -89,6 +105,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.1"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "2fb815080e44a09b85e0f2ca8a820b15053982b2e714b59267719e8a9ff17097"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.6.3"
   cross_file:
     dependency: transitive
     description:
@@ -200,6 +224,22 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: "408e3ca148b31c20282ad6f37ebfa6f4bdc8fede5b74bc2f08d9d92b55db3612"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: "0e7014b3b7d4dac1ca4d6114f82bf1782ee86745b9b42a92c9289c23d8a0ab63"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
   http:
     dependency: transitive
     description:
@@ -208,6 +248,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.13.5"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: "97486f20f9c2f7be8f514851703d0119c3596d14ea63227af6f7a481ef2b2f8b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
   http_parser:
     dependency: transitive
     description:
@@ -232,6 +280,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.18.0"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: "2ec25704aba361659e10e3e5f5d672068d332fc8ac516421d483a11e5cbd061e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
   js:
     dependency: transitive
     description:
@@ -256,6 +312,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
   matcher:
     dependency: transitive
     description:
@@ -288,6 +352,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.4"
+  mocktail:
+    dependency: "direct dev"
+    description:
+      name: mocktail
+      sha256: "80a996cd9a69284b3dc521ce185ffe9150cde69767c2d3a0720147d93c0cef53"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.0"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: "1c5b77ccc91e4823a5af61ee74e6b972db1ef98c2ff5a18d3161c982a55448bd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
   path:
     dependency: "direct main"
     description:
@@ -384,6 +472,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.7.3"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.1"
   process:
     dependency: transitive
     description:
@@ -392,6 +488,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.2.4"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "40d3ab1bbd474c4c2328c91e3a7df8c6dd629b79ece4c4bd04bee496a224fb0c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
   select_form_field:
     dependency: "direct main"
     description:
@@ -472,11 +576,59 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.5"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: ad29c505aee705f41a4d8963641f91ac4cee3c8fad5947e033390a7bd8180fa4
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: a41d3f53c4adf0f57480578c1d61d90342cd617de7fc8077b1304643c2d85c1e
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "9ca081be41c60190ebcb4766b2486a7d50261db7bd0f5d9615f2d653637a84c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: "84cf769ad83aa6bb61e0aa5a18e53aea683395f196a6f39c4c881fb90ed4f7ae"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "708b3f6b97248e5781f493b765c3337db11c5d2c81c3094f10904bfa8004c703"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.12"
   source_span:
     dependency: transitive
     description:
@@ -541,6 +693,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
+  test:
+    dependency: transitive
+    description:
+      name: test
+      sha256: a5fcd2d25eeadbb6589e80198a47d6a464ba3e2049da473943b8af9797900c2d
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.22.0"
   test_api:
     dependency: transitive
     description:
@@ -549,6 +709,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.4.16"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: "0ef9755ec6d746951ba0aabe62f874b707690b5ede0fecc818b138fcc9b14888"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.20"
   tuple:
     dependency: "direct main"
     description:
@@ -613,6 +781,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: e7fb6c2282f7631712b69c19d1bff82f3767eea33a2321c14fa59ad67ea391c7
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.4.0"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: "6a7f46926b01ce81bfc339da6a7f20afbe7733eff9846f6d6a5466aa4c6667c0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      sha256: d88238e5eac9a42bb43ca4e721edba3c08c6354d4a53063afaa568516217621b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "67d3a8b6c79e1987d19d848b0892e582dbb0c66c57cc1fef58a177dd2aa2823d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
   win32:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index 9b4d954..00de2d4 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -33,6 +33,7 @@ dev_dependencies:
 
   flutter_launcher_icons: ^0.13.1
   flutter_lints: ^2.0.0
+  mocktail: ^0.3.0
 
 flutter:
   uses-material-design: true
diff --git a/test/utils/ext/datetime_test.dart b/test/utils/ext/datetime_test.dart
new file mode 100644
index 0000000..eb4a301
--- /dev/null
+++ b/test/utils/ext/datetime_test.dart
@@ -0,0 +1,42 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:splitr/utils/ext/datetime.dart';
+
+void main() {
+  group('DateTimeExtension', () {
+    test('operator <', () {
+      final dateTime1 = DateTime(2023, 6, 15);
+      final dateTime2 = DateTime(2023, 6, 16);
+
+      expect(dateTime1 < dateTime2, true);
+      expect(dateTime2 < dateTime1, false);
+      expect(dateTime1 < dateTime1, false);
+    });
+
+    test('operator <=', () {
+      final dateTime1 = DateTime(2023, 6, 15);
+      final dateTime2 = DateTime(2023, 6, 16);
+
+      expect(dateTime1 <= dateTime2, true);
+      expect(dateTime2 <= dateTime1, false);
+      expect(dateTime1 <= dateTime1, true);
+    });
+
+    test('operator >', () {
+      final dateTime1 = DateTime(2023, 6, 15);
+      final dateTime2 = DateTime(2023, 6, 16);
+
+      expect(dateTime1 > dateTime2, false);
+      expect(dateTime2 > dateTime1, true);
+      expect(dateTime1 > dateTime1, false);
+    });
+
+    test('operator >=', () {
+      final dateTime1 = DateTime(2023, 6, 15);
+      final dateTime2 = DateTime(2023, 6, 16);
+
+      expect(dateTime1 >= dateTime2, false);
+      expect(dateTime2 >= dateTime1, true);
+      expect(dateTime1 >= dateTime1, true);
+    });
+  });
+}
diff --git a/test/utils/ext/list_test.dart b/test/utils/ext/list_test.dart
new file mode 100644
index 0000000..4061deb
--- /dev/null
+++ b/test/utils/ext/list_test.dart
@@ -0,0 +1,77 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:splitr/models/data.dart';
+import 'package:splitr/utils/ext/list.dart';
+
+class MockData extends Mock implements Data {}
+
+void main() {
+  group('ListExtension', () {
+    test(
+        'setPresence() should add the element if presence is true and not already present',
+        () {
+      final list = <int>[1, 2, 3];
+
+      list.setPresence(true, 4);
+      expect(list, <int>[1, 2, 3, 4]);
+
+      list.setPresence(true, 3);
+      expect(list, <int>[1, 2, 3, 4]);
+    });
+
+    test('setPresence() should remove the element if presence is false', () {
+      final list = <int>[1, 2, 3];
+
+      list.setPresence(false, 2);
+      expect(list, <int>[1, 3]);
+
+      list.setPresence(false, 4);
+      expect(list, <int>[1, 3]);
+    });
+  });
+
+  group('DataListExtension', () {
+    late List<Data> dataList;
+    late MockData data1;
+    late MockData data2;
+    late MockData data3;
+
+    setUp(() {
+      data1 = MockData();
+      data2 = MockData();
+      data3 = MockData();
+
+      dataList = <Data>[
+        data1,
+        data2,
+        data3,
+      ];
+    });
+
+    test('enabled() should return only enabled elements', () {
+      when(() => data1.deleted).thenAnswer((invocation) => false);
+      when(() => data2.deleted).thenAnswer((invocation) => true);
+      when(() => data3.deleted).thenAnswer((invocation) => false);
+
+      final enabledList = dataList.enabled();
+      expect(enabledList.toList(), <Data>[data1, data3]);
+    });
+
+    test('enabled() should return empty when no enabled elements', () {
+      when(() => data1.deleted).thenAnswer((invocation) => true);
+      when(() => data2.deleted).thenAnswer((invocation) => true);
+      when(() => data3.deleted).thenAnswer((invocation) => true);
+
+      final enabledList = dataList.enabled();
+      expect(enabledList.toList(), <Data>[]);
+    });
+    test('enabled() should not change anything when all enabled elements', () {
+      when(() => data1.deleted).thenAnswer((invocation) => false);
+      when(() => data2.deleted).thenAnswer((invocation) => false);
+      when(() => data3.deleted).thenAnswer((invocation) => false);
+
+      final enabledList = dataList.enabled();
+      expect(enabledList.toList(), dataList);
+    });
+  });
+}
diff --git a/test/utils/ext/set_test.dart b/test/utils/ext/set_test.dart
new file mode 100644
index 0000000..f88e1e5
--- /dev/null
+++ b/test/utils/ext/set_test.dart
@@ -0,0 +1,53 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:splitr/models/data.dart';
+import 'package:splitr/utils/ext/set.dart';
+
+class MockData extends Mock implements Data {}
+
+void main() {
+  group('DataSetExtension', () {
+    late Set<Data> dataList;
+    late MockData data1;
+    late MockData data2;
+    late MockData data3;
+
+    setUp(() {
+      data1 = MockData();
+      data2 = MockData();
+      data3 = MockData();
+
+      dataList = <Data>{
+        data1,
+        data2,
+        data3,
+      };
+    });
+
+    test('enabled() should return only enabled elements', () {
+      when(() => data1.deleted).thenAnswer((invocation) => false);
+      when(() => data2.deleted).thenAnswer((invocation) => true);
+      when(() => data3.deleted).thenAnswer((invocation) => false);
+
+      final enabledList = dataList.enabled();
+      expect(enabledList.toSet(), <Data>{data1, data3});
+    });
+
+    test('enabled() should return empty when no enabled elements', () {
+      when(() => data1.deleted).thenAnswer((invocation) => true);
+      when(() => data2.deleted).thenAnswer((invocation) => true);
+      when(() => data3.deleted).thenAnswer((invocation) => true);
+
+      final enabledList = dataList.enabled();
+      expect(enabledList.toSet(), <Data>{});
+    });
+    test('enabled() should not change anything when all enabled elements', () {
+      when(() => data1.deleted).thenAnswer((invocation) => false);
+      when(() => data2.deleted).thenAnswer((invocation) => false);
+      when(() => data3.deleted).thenAnswer((invocation) => false);
+
+      final enabledList = dataList.enabled();
+      expect(enabledList.toSet(), dataList);
+    });
+  });
+}
diff --git a/test/utils/ext/string_test.dart b/test/utils/ext/string_test.dart
new file mode 100644
index 0000000..b15d0d3
--- /dev/null
+++ b/test/utils/ext/string_test.dart
@@ -0,0 +1,31 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:splitr/utils/ext/string.dart';
+
+void main() {
+  group('StringExtension', () {
+    test(
+        'capitalize() should capitalize the first letter and lowercase the remaining letters',
+        () {
+      expect('hEllo WoRlD'.capitalize(), 'Hello world');
+    });
+
+    test('capitalize() should handle an empty string', () {
+      expect(''.capitalize(), '');
+    });
+
+    test(
+        'firstCapitalize() should capitalize the first letter without changing the remaining letters',
+        () {
+      expect('hello World'.firstCapitalize(), 'Hello World');
+    });
+
+    test('firstCapitalize() should handle an empty string', () {
+      expect(''.firstCapitalize(), '');
+    });
+
+    test('firstCapitalize() should handle a string with only one character',
+        () {
+      expect('a'.firstCapitalize(), 'A');
+    });
+  });
+}
diff --git a/test/utils/ext/time_test.dart b/test/utils/ext/time_test.dart
new file mode 100644
index 0000000..67aff17
--- /dev/null
+++ b/test/utils/ext/time_test.dart
@@ -0,0 +1,70 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:splitr/utils/ext/time.dart';
+
+void main() {
+  group('DateExtension', () {
+    late DateTime now;
+
+    setUp(() {
+      now = DateTime(
+          2023, 6, 15, 12, 0, 0); // Set a specific date and time for testing
+    });
+
+    test('toDate() should format the date correctly for current year', () {
+      final date = DateTime(DateTime.now().year, 5, 25);
+      final result = date.toDate();
+      expect(result, '25th May');
+    });
+
+    test('toDate() should format the date correctly for previous year', () {
+      final date = DateTime(2022, 5, 25);
+      final result = date.toDate();
+      expect(result, '25th May 2022');
+    });
+
+    test('toPocketTime() should format the date and time correctly', () {
+      final date = DateTime(2023, 5, 25, 8, 30, 0);
+      final result = date.toPocketTime();
+      expect(result, '2023-05-25 08:30:00');
+    });
+
+    test('getFullDate() should return the full formatted date', () {
+      final date = DateTime(2023, 5, 25);
+      final result = date.getFullDate();
+      expect(result, '25 May 2023');
+    });
+
+    test('getDay() should return a new DateTime with the same day', () {
+      final date = DateTime(2023, 5, 25, 8, 30, 0);
+      final result = date.getDay();
+      expect(result, DateTime(2023, 5, 25));
+    });
+
+    test('daysElapsed() should return the correct days elapsed', () {
+      final date = DateTime.now().subtract(const Duration(days: 3));
+      final result = date.daysElapsed();
+      expect(result, '3 days ago');
+    });
+
+    test(
+        'daysSince() should return the correct number of days since the given date',
+        () {
+      final date = DateTime(2023, 5, 10);
+      final result = now.daysSince(date);
+      expect(result, 36);
+    });
+
+    test('daysTo() should return the correct number of days to the given date',
+        () {
+      final date = DateTime(2023, 6, 20);
+      final result = now.daysTo(date);
+      expect(result, 5);
+    });
+
+    test('timeElapsed() should return the correct time elapsed', () {
+      final date = DateTime.now().subtract(const Duration(hours: 1));
+      final result = date.timeElapsed();
+      expect(result, '1 hour ago');
+    });
+  });
+}
diff --git a/test/utils/helper/random_test.dart b/test/utils/helper/random_test.dart
new file mode 100644
index 0000000..3824dab
--- /dev/null
+++ b/test/utils/helper/random_test.dart
@@ -0,0 +1,35 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:splitr/utils/helper/random.dart';
+
+void main() {
+  group('getRandom', () {
+    test('getRandom() should return a random string of the specified length',
+        () {
+      const length = 10;
+      final result = getRandom(length);
+
+      expect(result.length, length);
+    });
+
+    test(
+        'getRandom() should only contain characters from the given character set',
+        () {
+      const length = 10;
+      final result = getRandom(length);
+
+      const validCharacters =
+          'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789';
+      for (var i = 0; i < result.length; i++) {
+        expect(validCharacters.contains(result[i]), isTrue);
+      }
+    });
+
+    test('getRandom() should return different strings for different calls', () {
+      const length = 10;
+      final result1 = getRandom(length);
+      final result2 = getRandom(length);
+
+      expect(result1, isNot(result2));
+    });
+  });
+}