diff --git a/test/unit_tests/date_service_test.dart b/test/unit_tests/date_service_test.dart
new file mode 100644
index 0000000..13bf03b
--- /dev/null
+++ b/test/unit_tests/date_service_test.dart
@@ -0,0 +1,118 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:smoke_cess_app/services/date_service.dart';
+import 'package:smoke_cess_app/services/pages_service.dart';
+import 'package:timezone/data/latest.dart' as tz;
+import 'package:timezone/timezone.dart';
+
+void main() {
+  group('Helpers', () {
+    group('isSameDay', () {
+      test('returns true when dates are the same day', () {
+        DateTime dateA = DateTime.now();
+        DateTime dateB = DateTime(dateA.year, dateA.month, dateA.day, 10, 0);
+        expect(isSameDay(dateA, dateB), true);
+      });
+
+      test('returns false when dates are different days', () {
+        DateTime dateA = DateTime.now();
+        DateTime dateB = DateTime(dateA.year, dateA.month, dateA.day + 1, 10, 0);
+        expect(isSameDay(dateA, dateB), false);
+      });
+
+      test('returns false when one date is null', () {
+        DateTime? dateA = DateTime.now();
+        DateTime? dateB;
+        expect(isSameDay(dateA, dateB), false);
+      });
+    });
+
+    group('createTZDateTimes', () {
+      test('returns empty list when selectedDays is null', () {
+        List<TZDateTime> tzDateTimes =
+            createTZDateTimes(null, 10, 0);
+        expect(tzDateTimes, []);
+      });
+
+      test('returns empty list when selectedHours is null', () {
+        List<TZDateTime> tzDateTimes =
+            createTZDateTimes(['Montag'], null, 0);
+        expect(tzDateTimes, []);
+      });
+
+      test('returns empty list when selectedMinutes is null', () {
+        List<TZDateTime> tzDateTimes =
+            createTZDateTimes(['Montag'], 10, null);
+        expect(tzDateTimes, []);
+      });
+
+      test('returns empty list when no valid dates are found', () {
+        List<TZDateTime> tzDateTimes =
+            createTZDateTimes(['Montag'], 10, 0);
+        expect(tzDateTimes, []);
+      });
+
+      test('returns list of valid dates', () {
+        List<TZDateTime> tzDateTimes =
+            createTZDateTimes(['Montag'], 10, 0);
+        expect(tzDateTimes.length, greaterThan(0));
+      });
+    });
+
+    group('getTimeTill', () {
+      test('returns time till next mood', () async {
+        Duration duration = await getTimeTill(Pages.mood);
+        expect(duration, isNotNull);
+      });
+
+      test('returns time till next sleep', () async {
+        Duration duration = await getTimeTill(Pages.sleep);
+        expect(duration, isNotNull);
+      });
+      //?
+      test('returns time till next workout', () async {
+        Duration duration = await getTimeTill(Pages.relapse);
+        expect(duration, isNotNull);
+      });
+      //?
+      test('returns time till next workout', () async {
+        Duration duration = await getTimeTill(Pages.settings);
+        expect(duration, isNotNull);
+      });
+      test('returns time till next workout', () async {
+        Duration duration = await getTimeTill(Pages.timer);
+        expect(duration, isNotNull);
+      });
+    });
+  });
+
+  group('Helper functions', () {
+    setUp(() async {
+      tz.initializeTimeZones();
+    });
+
+    test('isSameDay returns true if two dates are the same day', () {
+      final date1 = DateTime(2022, 3, 6);
+      final date2 = DateTime(2022, 3, 6, 15, 30);
+      final result = isSameDay(date1, date2);
+      expect(result, true);
+    });
+
+    test('isSameDay returns false if two dates are not the same day', () {
+      final date1 = DateTime(2022, 3, 6);
+      final date2 = DateTime(2022, 3, 7);
+      final result = isSameDay(date1, date2);
+      expect(result, false);
+    });
+
+    test('createTZDateTimes returns a list of TZDateTime objects', () async {
+      final selectedDays = ['Montag', 'Dienstag'];
+      final selectedHours = 12;
+      final selectedMinutes = 30;
+      final result = await createTZDateTimes(
+          selectedDays, selectedHours, selectedMinutes);
+      expect(result, isA<List<TZDateTime>>());
+    });
+  });
+
+  
+}
diff --git a/test/unit_tests/settings_provider_test.dart b/test/unit_tests/settings_provider_test.dart
new file mode 100644
index 0000000..4d43184
--- /dev/null
+++ b/test/unit_tests/settings_provider_test.dart
@@ -0,0 +1,28 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:smoke_cess_app/providers/settings_provider.dart';
+
+void main() {
+  group('SettingsProvider', () {
+    test('initial state', () {
+      final provider = SettingsProvider();
+      expect(provider.settings, isNull);
+      expect(provider.initialized, isFalse);
+      expect(provider.scanning, isFalse);
+    });
+
+    test('initialize settings', () async {
+      final provider = SettingsProvider();
+      provider.initSettings();
+      expect(provider.settings, isNotNull);
+      expect(provider.initialized, isTrue);
+    });
+
+    test('set scanning', () {
+      final provider = SettingsProvider();
+      provider.scanning = true;
+      expect(provider.scanning, isTrue);
+      provider.scanning = false;
+      expect(provider.scanning, isFalse);
+    });
+  });
+}
diff --git a/test/unit_tests/workout_provider_test.dart b/test/unit_tests/workout_provider_test.dart
new file mode 100644
index 0000000..31d7784
--- /dev/null
+++ b/test/unit_tests/workout_provider_test.dart
@@ -0,0 +1,75 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/material.dart';
+import 'package:smoke_cess_app/providers/audio_provider.dart';
+import 'package:smoke_cess_app/providers/timer_provider.dart';
+import 'package:smoke_cess_app/providers/workout_provider.dart';
+
+void main() {
+  group('WorkoutProvider', () {
+    late WorkoutProvider workoutProvider;
+    late TimerProvider timerProvider;
+    late AudioProvider audioProvider;
+
+    setUp(() {
+      timerProvider = TimerProvider();
+      audioProvider = AudioProvider();
+      workoutProvider = WorkoutProvider(timerProvider, audioProvider);
+    });
+
+    test('initial values', () {
+      expect(workoutProvider.isWorkoutStarted, false);
+      expect(workoutProvider.isWorkoutComplete, false);
+      expect(workoutProvider.motivationBefore, 50);
+      expect(workoutProvider.motivationAfter, 50);
+      expect(workoutProvider.currentPhase, WorkoutPhases.warmUp);
+      expect(workoutProvider.currentPhaseDuration, const Duration(seconds: 5));
+      expect(workoutProvider.isPhaseComplete, false);
+      expect(workoutProvider.currentPhaseColor, Colors.green);
+      expect(workoutProvider.currentPhaseTitle, 'Warm Up');
+    });
+
+    test('next phase', () {
+      workoutProvider.nextPhase();
+
+      expect(workoutProvider.currentPhase, WorkoutPhases.highIntensity);
+      expect(workoutProvider.currentPhaseDuration, const Duration(seconds: 4));
+      expect(workoutProvider.isPhaseComplete, false);
+      expect(workoutProvider.currentPhaseColor, Colors.red);
+      expect(workoutProvider.currentPhaseTitle, 'High Intensity');
+    });
+
+    test('start workout', () {
+      workoutProvider.startWorkout();
+
+      expect(workoutProvider.isWorkoutStarted, true);
+      expect(workoutProvider.isWorkoutComplete, false);
+      expect(workoutProvider.currentPhase, WorkoutPhases.warmUp);
+      expect(workoutProvider.currentPhaseDuration, const Duration(seconds: 5));
+      expect(workoutProvider.isPhaseComplete, false);
+    });
+
+    test('stop workout', () {
+      workoutProvider.startWorkout();
+      workoutProvider.stopWorkout();
+
+      expect(workoutProvider.isWorkoutStarted, false);
+      expect(workoutProvider.isWorkoutComplete, true);
+    });
+
+    test('interrupt workout', () {
+      workoutProvider.startWorkout();
+      workoutProvider.interruptWorkout();
+
+      expect(workoutProvider.isWorkoutStarted, false);
+      expect(workoutProvider.isWorkoutComplete, false);
+    });
+
+    // test('save workout', () {
+    //   workoutProvider.motivationBefore = 70;
+    //   workoutProvider.motivationAfter = 80;
+    //   workoutProvider.saveWorkout();
+
+    //   // -> hier in datenbank nachschauen obs geklappt hat
+    // });
+  });
+}