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QuellCode/CentronERP war nur als Gitlink (Submodul-Referenz auf 79c1142)
getrackt, ohne .gitmodules und ohne erreichbares Remote. Der
Untersuchungsgegenstand der Versuchsreihe war damit nicht reproduzierbar
gesichert: Ein Klon haette ein leeres Verzeichnis erhalten, und die Belege
der 3.287 Anforderungen waeren nicht ueberpruefbar gewesen.

Umstellung:
- Historie nach c:\DEV\CentronERP_git_snapshot_79c1142 ausgelagert
  (vollstaendig lesbar, enthaelt 79c1142 und Vorgaenger 89ccfd6)
- Gitlink aus dem Index entfernt
- Dateiinhalt aufgenommen: 24.557 Dateien, rund 333 MB

Die verschachtelte .gitignore der Codebasis gilt weiter, Build-Artefakte
bleiben ausgeschlossen. Details in Versuche/Versuch_01/_Codebasis-Nachweis.md

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Daily_Every1Day.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-12T00:00:00',
+  '2020-09-13T00:00:00',
+  '2020-09-14T00:00:00',
+  '2020-09-15T00:00:00',
+  '2020-09-16T00:00:00',
+  '2020-09-17T00:00:00',
+  '2020-09-18T00:00:00',
+  '2020-09-19T00:00:00',
+  '2020-09-20T00:00:00',
+  '2020-09-21T00:00:00',
+  '2020-09-22T00:00:00',
+  '2020-09-23T00:00:00',
+  '2020-09-24T00:00:00',
+  '2020-09-25T00:00:00',
+  '2020-09-26T00:00:00',
+  '2020-09-27T00:00:00',
+  '2020-09-28T00:00:00',
+  '2020-09-29T00:00:00',
+  '2020-09-30T00:00:00',
+  '2020-10-01T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Daily_Every2Days.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-13T00:00:00',
+  '2020-09-15T00:00:00',
+  '2020-09-17T00:00:00',
+  '2020-09-19T00:00:00',
+  '2020-09-21T00:00:00',
+  '2020-09-23T00:00:00',
+  '2020-09-25T00:00:00',
+  '2020-09-27T00:00:00',
+  '2020-09-29T00:00:00',
+  '2020-10-01T00:00:00',
+  '2020-10-03T00:00:00',
+  '2020-10-05T00:00:00',
+  '2020-10-07T00:00:00',
+  '2020-10-09T00:00:00',
+  '2020-10-11T00:00:00',
+  '2020-10-13T00:00:00',
+  '2020-10-15T00:00:00',
+  '2020-10-17T00:00:00',
+  '2020-10-19T00:00:00',
+  '2020-10-21T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Daily_EveryWeekday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-14T00:00:00',
+  '2020-09-15T00:00:00',
+  '2020-09-16T00:00:00',
+  '2020-09-17T00:00:00',
+  '2020-09-18T00:00:00',
+  '2020-09-21T00:00:00',
+  '2020-09-22T00:00:00',
+  '2020-09-23T00:00:00',
+  '2020-09-24T00:00:00',
+  '2020-09-25T00:00:00',
+  '2020-09-28T00:00:00',
+  '2020-09-29T00:00:00',
+  '2020-09-30T00:00:00',
+  '2020-10-01T00:00:00',
+  '2020-10-02T00:00:00',
+  '2020-10-05T00:00:00',
+  '2020-10-06T00:00:00',
+  '2020-10-07T00:00:00',
+  '2020-10-08T00:00:00',
+  '2020-10-09T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every2MonthsOnThe20thDay.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-20T00:00:00',
+  '2020-11-20T00:00:00',
+  '2021-01-20T00:00:00',
+  '2021-03-20T00:00:00',
+  '2021-05-20T00:00:00',
+  '2021-07-20T00:00:00',
+  '2021-09-20T00:00:00',
+  '2021-11-20T00:00:00',
+  '2022-01-20T00:00:00',
+  '2022-03-20T00:00:00',
+  '2022-05-20T00:00:00',
+  '2022-07-20T00:00:00',
+  '2022-09-20T00:00:00',
+  '2022-11-20T00:00:00',
+  '2023-01-20T00:00:00',
+  '2023-03-20T00:00:00',
+  '2023-05-20T00:00:00',
+  '2023-07-20T00:00:00',
+  '2023-09-20T00:00:00',
+  '2023-11-20T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every2MonthsOnTheFirstMonday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2025-12-01T00:00:00',
+  '2026-02-02T00:00:00',
+  '2026-04-06T00:00:00',
+  '2026-06-01T00:00:00',
+  '2026-08-03T00:00:00',
+  '2026-10-05T00:00:00',
+  '2026-12-07T00:00:00',
+  '2027-02-01T00:00:00',
+  '2027-04-05T00:00:00',
+  '2027-06-07T00:00:00',
+  '2027-08-02T00:00:00',
+  '2027-10-04T00:00:00',
+  '2027-12-06T00:00:00',
+  '2028-02-07T00:00:00',
+  '2028-04-03T00:00:00',
+  '2028-06-05T00:00:00',
+  '2028-08-07T00:00:00',
+  '2028-10-02T00:00:00',
+  '2028-12-04T00:00:00',
+  '2029-02-05T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every2MonthsOnTheLastFriday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-25T00:00:00',
+  '2020-11-27T00:00:00',
+  '2021-01-29T00:00:00',
+  '2021-03-26T00:00:00',
+  '2021-05-28T00:00:00',
+  '2021-07-30T00:00:00',
+  '2021-09-24T00:00:00',
+  '2021-11-26T00:00:00',
+  '2022-01-28T00:00:00',
+  '2022-03-25T00:00:00',
+  '2022-05-27T00:00:00',
+  '2022-07-29T00:00:00',
+  '2022-09-30T00:00:00',
+  '2022-11-25T00:00:00',
+  '2023-01-27T00:00:00',
+  '2023-03-31T00:00:00',
+  '2023-05-26T00:00:00',
+  '2023-07-28T00:00:00',
+  '2023-09-29T00:00:00',
+  '2023-11-24T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every3MonthsOnThe31st_StartingJanuary31.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2024-04-30T00:00:00',
+  '2024-07-31T00:00:00',
+  '2024-10-31T00:00:00',
+  '2025-01-31T00:00:00',
+  '2025-04-30T00:00:00',
+  '2025-07-31T00:00:00',
+  '2025-10-31T00:00:00',
+  '2026-01-31T00:00:00',
+  '2026-04-30T00:00:00',
+  '2026-07-31T00:00:00',
+  '2026-10-31T00:00:00',
+  '2027-01-31T00:00:00',
+  '2027-04-30T00:00:00',
+  '2027-07-31T00:00:00',
+  '2027-10-31T00:00:00',
+  '2028-01-31T00:00:00',
+  '2028-04-30T00:00:00',
+  '2028-07-31T00:00:00',
+  '2028-10-31T00:00:00',
+  '2029-01-31T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every3MonthsOnTheFirstMonday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2026-01-05T00:00:00',
+  '2026-04-06T00:00:00',
+  '2026-07-06T00:00:00',
+  '2026-10-05T00:00:00',
+  '2027-01-04T00:00:00',
+  '2027-04-05T00:00:00',
+  '2027-07-05T00:00:00',
+  '2027-10-04T00:00:00',
+  '2028-01-03T00:00:00',
+  '2028-04-03T00:00:00',
+  '2028-07-03T00:00:00',
+  '2028-10-02T00:00:00',
+  '2029-01-01T00:00:00',
+  '2029-04-02T00:00:00',
+  '2029-07-02T00:00:00',
+  '2029-10-01T00:00:00',
+  '2030-01-07T00:00:00',
+  '2030-04-01T00:00:00',
+  '2030-07-01T00:00:00',
+  '2030-10-07T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every3MonthsOnTheSecondTuesday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2025-10-14T00:00:00',
+  '2026-01-13T00:00:00',
+  '2026-04-14T00:00:00',
+  '2026-07-14T00:00:00',
+  '2026-10-13T00:00:00',
+  '2027-01-12T00:00:00',
+  '2027-04-13T00:00:00',
+  '2027-07-13T00:00:00',
+  '2027-10-12T00:00:00',
+  '2028-01-11T00:00:00',
+  '2028-04-11T00:00:00',
+  '2028-07-11T00:00:00',
+  '2028-10-10T00:00:00',
+  '2029-01-09T00:00:00',
+  '2029-04-10T00:00:00',
+  '2029-07-10T00:00:00',
+  '2029-10-09T00:00:00',
+  '2030-01-08T00:00:00',
+  '2030-04-09T00:00:00',
+  '2030-07-09T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_Every4MonthsOnThe31st_StartingJanuary31.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2024-05-31T00:00:00',
+  '2024-09-30T00:00:00',
+  '2025-01-31T00:00:00',
+  '2025-05-31T00:00:00',
+  '2025-09-30T00:00:00',
+  '2026-01-31T00:00:00',
+  '2026-05-31T00:00:00',
+  '2026-09-30T00:00:00',
+  '2027-01-31T00:00:00',
+  '2027-05-31T00:00:00',
+  '2027-09-30T00:00:00',
+  '2028-01-31T00:00:00',
+  '2028-05-31T00:00:00',
+  '2028-09-30T00:00:00',
+  '2029-01-31T00:00:00',
+  '2029-05-31T00:00:00',
+  '2029-09-30T00:00:00',
+  '2030-01-31T00:00:00',
+  '2030-05-31T00:00:00',
+  '2030-09-30T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_EveryMonthOnThe30thDay.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-30T00:00:00',
+  '2020-10-30T00:00:00',
+  '2020-11-30T00:00:00',
+  '2020-12-30T00:00:00',
+  '2021-01-30T00:00:00',
+  '2021-02-28T00:00:00',
+  '2021-03-30T00:00:00',
+  '2021-04-30T00:00:00',
+  '2021-05-30T00:00:00',
+  '2021-06-30T00:00:00',
+  '2021-07-30T00:00:00',
+  '2021-08-30T00:00:00',
+  '2021-09-30T00:00:00',
+  '2021-10-30T00:00:00',
+  '2021-11-30T00:00:00',
+  '2021-12-30T00:00:00',
+  '2022-01-30T00:00:00',
+  '2022-02-28T00:00:00',
+  '2022-03-30T00:00:00',
+  '2022-04-30T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_EveryMonthOnTheFirstMonday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-10-05T00:00:00',
+  '2020-11-02T00:00:00',
+  '2020-12-07T00:00:00',
+  '2021-01-04T00:00:00',
+  '2021-02-01T00:00:00',
+  '2021-03-01T00:00:00',
+  '2021-04-05T00:00:00',
+  '2021-05-03T00:00:00',
+  '2021-06-07T00:00:00',
+  '2021-07-05T00:00:00',
+  '2021-08-02T00:00:00',
+  '2021-09-06T00:00:00',
+  '2021-10-04T00:00:00',
+  '2021-11-01T00:00:00',
+  '2021-12-06T00:00:00',
+  '2022-01-03T00:00:00',
+  '2022-02-07T00:00:00',
+  '2022-03-07T00:00:00',
+  '2022-04-04T00:00:00',
+  '2022-05-02T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Monthly_EveryMonthOnTheTenthDay.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-10-10T00:00:00',
+  '2020-11-10T00:00:00',
+  '2020-12-10T00:00:00',
+  '2021-01-10T00:00:00',
+  '2021-02-10T00:00:00',
+  '2021-03-10T00:00:00',
+  '2021-04-10T00:00:00',
+  '2021-05-10T00:00:00',
+  '2021-06-10T00:00:00',
+  '2021-07-10T00:00:00',
+  '2021-08-10T00:00:00',
+  '2021-09-10T00:00:00',
+  '2021-10-10T00:00:00',
+  '2021-11-10T00:00:00',
+  '2021-12-10T00:00:00',
+  '2022-01-10T00:00:00',
+  '2022-02-10T00:00:00',
+  '2022-03-10T00:00:00',
+  '2022-04-10T00:00:00',
+  '2022-05-10T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/TaskManagementRecurrenceTest.cs

@@ -0,0 +1,332 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Centron.BusinessLogic.TaskManager;
+using Centron.Data.Entities.TaskManager.Recurrences;
+using Centron.Tests.EndToEnd.Infrastructure;
+using Xunit;
+using Xunit.Abstractions;
+
+
+namespace Centron.Tests.EndToEnd.Tests.TaskManagementRecurrence
+{
+    public class TaskManagementRecurrenceTest : CentronTest
+    {
+        public TaskManagementRecurrenceTest(ITestOutputHelper testOutputHelper) 
+            : base(testOutputHelper)
+        {
+            this.Verifier.Settings.CleanupDateTimeValues = false;
+        }
+        
+        [Fact]
+        public void Daily_EveryWeekday()
+        {
+            var startTime = new DateTime(2020, 9, 11);
+        
+            var recurrence = new TaskManagementDailyRecurrence
+            {
+                StartTime = startTime, 
+                EveryWeekday = true
+            };
+            
+            this.VerifyDates("Daily_EveryWeekday", recurrence, startTime);
+        }
+
+        [Fact]
+        public void Daily_Every1Days()
+        {
+            var startTime = new DateTime(2020, 9, 11);
+            
+            var recurrence = new TaskManagementDailyRecurrence
+            {
+                StartTime = startTime, 
+                DayInterval = 1,
+            };
+
+            this.VerifyDates("Daily_Every1Day", recurrence, startTime);
+        }
+
+        [Fact]
+        public void Daily_Every2Days()
+        {
+            var startTime = new DateTime(2020, 9, 11);
+            
+            var recurrence = new TaskManagementDailyRecurrence
+            {
+                StartTime = startTime, 
+                DayInterval = 2,
+            };
+
+            this.VerifyDates("Daily_Every2Days", recurrence, startTime);
+        }
+        
+
+        [Fact]
+        public void Weekly_Every1WeekOnMonday()
+        {
+            var startTime = new DateTime(2020, 9, 14);
+            
+            var recurrence = new TaskManagementWeeklyRecurrence
+            {
+                StartTime = startTime,
+                EveryNWeeks = 1,
+                Days = new List<TaskManagementRecurrenceWeekDays>
+                {
+                    new TaskManagementRecurrenceWeekDays
+                    {
+                        WeekDay = DayOfWeek.Monday
+                    }
+                }
+            };
+            
+            this.VerifyDates("Weekly_Every1WeekOnMonday", recurrence, startTime);
+        }
+
+        [Fact]
+        public void Weekly_Every2WeeksOnMondayTuesdayAndWednesday()
+        {
+            var startTime = new DateTime(2020, 9, 14);
+            
+            var recurrence = new TaskManagementWeeklyRecurrence
+            {
+                StartTime = startTime,
+                EveryNWeeks = 2,
+                Days = new List<TaskManagementRecurrenceWeekDays>
+                {
+                    new TaskManagementRecurrenceWeekDays
+                    {
+                        WeekDay = DayOfWeek.Monday,
+                    },
+                    new TaskManagementRecurrenceWeekDays
+                    {
+                        WeekDay = DayOfWeek.Tuesday,
+                    },
+                    new TaskManagementRecurrenceWeekDays
+                    {
+                        WeekDay = DayOfWeek.Wednesday,
+                    }
+                }
+            };
+            
+            this.VerifyDates("Weekly_Every2WeeksOnMondayTuesdayAndWednesday", recurrence, startTime);
+        }
+        
+
+        [Fact]
+        public void Monthly_EveryMonthOnTheTenthDay()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate, 
+                MonthInterval = 1, 
+                DayOfMonth = 10,
+            };
+            
+            this.VerifyDates("Monthly_EveryMonthOnTheTenthDay", recurrence, startDate);
+        }
+        
+        [Fact]
+        public void Monthly_EveryMonthOnThe30thDay()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate, 
+                MonthInterval = 1, 
+                DayOfMonth = 30,
+            };
+            
+            this.VerifyDates("Monthly_EveryMonthOnThe30thDay", recurrence, startDate);
+        }
+        
+        [Fact]
+        public void Monthly_Every2MonthsOnThe20thDay()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate, 
+                MonthInterval = 2, 
+                DayOfMonth = 20,
+            };
+            
+            this.VerifyDates("Monthly_Every2MonthsOnThe20thDay", recurrence, startDate);
+        }
+        
+        [Fact]
+        public void Monthly_EveryMonthOnTheFirstMonday()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate, 
+                MonthInterval = 1,
+                WeekDay = DayOfWeek.Monday,
+                WeekInterval = 1
+            };
+            
+            this.VerifyDates("Monthly_EveryMonthOnTheFirstMonday", recurrence, startDate);
+        }
+        
+        [Fact]
+        public void Monthly_Every2MonthsOnTheLastFriday()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate, 
+                MonthInterval = 2,
+                WeekDay = DayOfWeek.Friday,
+                WeekInterval = 5,
+            };
+            
+            this.VerifyDates("Monthly_Every2MonthsOnTheLastFriday", recurrence, startDate);
+        }
+
+
+        [Fact]
+        public void Monthly_Every3MonthsOnTheFirstMonday()
+        {
+            // Ticket 168438 / 167839: "first weekday of every Nth month" (WeekOfMonth.First + MonthInterval > 1)
+            // regressed to an effective N*N-month step (3 -> 9). Customer contract 14077 starts on the first
+            // Monday in October 2025 and should recur strictly every 3 months.
+            var startDate = new DateTime(2025, 10, 6);
+
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate,
+                MonthInterval = 3,
+                WeekDay = DayOfWeek.Monday,
+                WeekInterval = 1, // WeekOfMonth.First
+            };
+
+            this.VerifyDates("Monthly_Every3MonthsOnTheFirstMonday", recurrence, startDate);
+        }
+
+        [Fact]
+        public void Monthly_Every3MonthsOnTheSecondTuesday()
+        {
+            var startDate = new DateTime(2025, 10, 6);
+
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate,
+                MonthInterval = 3,
+                WeekDay = DayOfWeek.Tuesday,
+                WeekInterval = 2, // WeekOfMonth.Second
+            };
+
+            this.VerifyDates("Monthly_Every3MonthsOnTheSecondTuesday", recurrence, startDate);
+        }
+
+        [Fact]
+        public void Monthly_Every2MonthsOnTheFirstMonday()
+        {
+            var startDate = new DateTime(2025, 10, 6);
+
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate,
+                MonthInterval = 2,
+                WeekDay = DayOfWeek.Monday,
+                WeekInterval = 1, // WeekOfMonth.First
+            };
+
+            this.VerifyDates("Monthly_Every2MonthsOnTheFirstMonday", recurrence, startDate);
+        }
+
+
+        [Fact]
+        public void Yearly_OnTheFirstOfFebruary()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementYearlyRecurrence
+            {
+                StartTime = startDate,
+                Month = 2,
+                DayOfMonth = 1
+            };
+            
+            this.VerifyDates("Yearly_OnTheFirstOfFebruary", recurrence, startDate);
+        }
+        
+        [Fact]
+        public void Yearly_OnThe29thOfFebruary()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+            
+            var recurrence = new TaskManagementYearlyRecurrence
+            {
+                StartTime = startDate,
+                Month = 2,
+                DayOfMonth = 29
+            };
+            
+            this.VerifyDates("Yearly_OnThe29thOfFebruary", recurrence, startDate);
+        }
+
+        [Fact]
+        public void Yearly_OnTheFirstMondayInMarch()
+        {
+            var startDate = new DateTime(2020, 9, 10);
+
+            var recurrence = new TaskManagementYearlyRecurrence
+            {
+                StartTime = startDate,
+                Month = 3,
+                WeekDay = DayOfWeek.Monday,
+                WeekInterval = 1
+            };
+
+            this.VerifyDates("Yearly_OnTheFirstMondayInMarch", recurrence, startDate);
+        }
+
+        [Fact]
+        public void Monthly_Every4MonthsOnThe31st_StartingJanuary31()
+        {
+            var startDate = new DateTime(2024, 1, 31);
+
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate,
+                MonthInterval = 4,
+                DayOfMonth = 31,
+            };
+
+            this.VerifyDates("Monthly_Every4MonthsOnThe31st_StartingJanuary31", recurrence, startDate);
+        }
+
+        [Fact]
+        public void Monthly_Every3MonthsOnThe31st_StartingJanuary31()
+        {
+            var startDate = new DateTime(2024, 1, 31);
+
+            var recurrence = new TaskManagementMonthlyRecurrence
+            {
+                StartTime = startDate,
+                MonthInterval = 3,
+                DayOfMonth = 31,
+            };
+
+            this.VerifyDates("Monthly_Every3MonthsOnThe31st_StartingJanuary31", recurrence, startDate);
+        }
+
+
+        private void VerifyDates(string name, TaskManagementBaseRecurrence recurrence, DateTime start, int daysCount = 20)
+        {
+            var calculator = new TaskManagementTaskBL.RecurrenceCalculator(recurrence);
+            var dates = calculator.GetDates(start).Take(daysCount).ToList();
+            
+            this.Verifier.Verify(name, dates);
+            
+            Assert.DoesNotContain(dates, f => f.Date == start.Date); // Does NEVER contain the start date
+        }
+    }
+}

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Weekly_Every1WeekOnMonday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-21T00:00:00',
+  '2020-09-28T00:00:00',
+  '2020-10-05T00:00:00',
+  '2020-10-12T00:00:00',
+  '2020-10-19T00:00:00',
+  '2020-10-26T00:00:00',
+  '2020-11-02T00:00:00',
+  '2020-11-09T00:00:00',
+  '2020-11-16T00:00:00',
+  '2020-11-23T00:00:00',
+  '2020-11-30T00:00:00',
+  '2020-12-07T00:00:00',
+  '2020-12-14T00:00:00',
+  '2020-12-21T00:00:00',
+  '2020-12-28T00:00:00',
+  '2021-01-04T00:00:00',
+  '2021-01-11T00:00:00',
+  '2021-01-18T00:00:00',
+  '2021-01-25T00:00:00',
+  '2021-02-01T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Weekly_Every2WeeksOnMondayTuesdayAndWednesday.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2020-09-15T00:00:00',
+  '2020-09-16T00:00:00',
+  '2020-09-28T00:00:00',
+  '2020-09-29T00:00:00',
+  '2020-09-30T00:00:00',
+  '2020-10-12T00:00:00',
+  '2020-10-13T00:00:00',
+  '2020-10-14T00:00:00',
+  '2020-10-26T00:00:00',
+  '2020-10-27T00:00:00',
+  '2020-10-28T00:00:00',
+  '2020-11-09T00:00:00',
+  '2020-11-10T00:00:00',
+  '2020-11-11T00:00:00',
+  '2020-11-23T00:00:00',
+  '2020-11-24T00:00:00',
+  '2020-11-25T00:00:00',
+  '2020-12-07T00:00:00',
+  '2020-12-08T00:00:00',
+  '2020-12-09T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Yearly_OnThe29thOfFebruary.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2021-02-28T00:00:00',
+  '2022-02-28T00:00:00',
+  '2023-02-28T00:00:00',
+  '2024-02-29T00:00:00',
+  '2025-02-28T00:00:00',
+  '2026-02-28T00:00:00',
+  '2027-02-28T00:00:00',
+  '2028-02-29T00:00:00',
+  '2029-02-28T00:00:00',
+  '2030-02-28T00:00:00',
+  '2031-02-28T00:00:00',
+  '2032-02-29T00:00:00',
+  '2033-02-28T00:00:00',
+  '2034-02-28T00:00:00',
+  '2035-02-28T00:00:00',
+  '2036-02-29T00:00:00',
+  '2037-02-28T00:00:00',
+  '2038-02-28T00:00:00',
+  '2039-02-28T00:00:00',
+  '2040-02-29T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Yearly_OnTheFirstMondayInMarch.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2021-03-01T00:00:00',
+  '2022-03-07T00:00:00',
+  '2023-03-06T00:00:00',
+  '2024-03-04T00:00:00',
+  '2025-03-03T00:00:00',
+  '2026-03-02T00:00:00',
+  '2027-03-01T00:00:00',
+  '2028-03-06T00:00:00',
+  '2029-03-05T00:00:00',
+  '2030-03-04T00:00:00',
+  '2031-03-03T00:00:00',
+  '2032-03-01T00:00:00',
+  '2033-03-07T00:00:00',
+  '2034-03-06T00:00:00',
+  '2035-03-05T00:00:00',
+  '2036-03-03T00:00:00',
+  '2037-03-02T00:00:00',
+  '2038-03-01T00:00:00',
+  '2039-03-07T00:00:00',
+  '2040-03-05T00:00:00'
+]

QuellCode/CentronERP/tests/Centron.Tests.EndToEnd/Tests/TaskManagementRecurrence/Yearly_OnTheFirstOfFebruary.expected.txt

@@ -0,0 +1,22 @@
+[
+  '2021-02-01T00:00:00',
+  '2022-02-01T00:00:00',
+  '2023-02-01T00:00:00',
+  '2024-02-01T00:00:00',
+  '2025-02-01T00:00:00',
+  '2026-02-01T00:00:00',
+  '2027-02-01T00:00:00',
+  '2028-02-01T00:00:00',
+  '2029-02-01T00:00:00',
+  '2030-02-01T00:00:00',
+  '2031-02-01T00:00:00',
+  '2032-02-01T00:00:00',
+  '2033-02-01T00:00:00',
+  '2034-02-01T00:00:00',
+  '2035-02-01T00:00:00',
+  '2036-02-01T00:00:00',
+  '2037-02-01T00:00:00',
+  '2038-02-01T00:00:00',
+  '2039-02-01T00:00:00',
+  '2040-02-01T00:00:00'
+]