Added unit tests for date parsing

lib/pages/list/task_edit.dart

@@ -9,6 +9,7 @@ import 'package:vikunja_app/models/task.dart';
 import 'package:vikunja_app/theme/button.dart';
 import 'package:vikunja_app/theme/buttonText.dart';
 import 'package:vikunja_app/theme/constants.dart';
+import 'package:vikunja_app/utils/repeat_after_parse.dart';
 
 class TaskEditPage extends StatefulWidget {
   final Task task;
@@ -34,6 +35,9 @@ class _TaskEditPageState extends State<TaskEditPage> {
 
   @override
   Widget build(BuildContext ctx) {
+    _repeatAfterType = getRepeatAfterTypeFromDuration(widget.task.repeatAfter);
+    _repeatAfterValue = getRepeatAfterValueFromDuration(widget.task.repeatAfter);
+
     return Scaffold(
       appBar: AppBar(
         title: Text('Edit Task'),
@@ -112,8 +116,7 @@ class _TaskEditPageState extends State<TaskEditPage> {
                                     : _repeatAfterValue.toString(),
                                 onSaved: (repeatAfter) => _repeatAfter =
                                     _makeDurationFromType(
-                                        repeatAfter,
-                                        _repeatAfterType),
+                                        repeatAfter, _repeatAfterType),
                                 decoration: new InputDecoration(
                                   labelText: 'Repeat after',
                                   border: InputBorder.none,
@@ -207,7 +210,6 @@ class _TaskEditPageState extends State<TaskEditPage> {
   }
 
   _makeDurationFromType(String value, String type) {
-
     // Return an empty duration if either of the values is not set
     if (value == null || value == '' || type == null || type == '') {
       return Duration();

lib/utils/repeat_after_parse.dart

@@ -0,0 +1,44 @@
+getRepeatAfterTypeFromDuration(Duration repeatAfter) {
+  if (repeatAfter == null || repeatAfter.inSeconds == 0) {
+    return null;
+  }
+  
+  // if its dividable by 24, its something with days, otherwise hours
+  if (repeatAfter.inHours % 24 == 0) {
+    if (repeatAfter.inDays % 7 == 0) {
+      return 'Weeks';
+    } else if (repeatAfter.inDays % 365 == 0) {
+      return 'Years';
+    } else if (repeatAfter.inDays % 30 == 0) {
+      return 'Months';
+    } else {
+      return 'Days';
+    }
+  }
+  return 'Hours';
+}
+
+getRepeatAfterValueFromDuration(Duration repeatAfter) {
+  if (repeatAfter == null || repeatAfter.inSeconds == 0) {
+    return null;
+  }
+
+  // if its dividable by 24, its something with days, otherwise hours
+  if (repeatAfter.inHours % 24 == 0) {
+    if (repeatAfter.inDays % 7 == 0) {
+      // Weeks
+      return (repeatAfter.inDays / 7).round();
+    } else if (repeatAfter.inDays % 365 == 0) {
+      // Years
+      return (repeatAfter.inDays / 365).round();
+    } else if (repeatAfter.inDays % 30 == 0) {
+      // Months
+      return (repeatAfter.inDays / 30).round();
+    } else {
+      return repeatAfter.inDays; // Days
+    }
+  }
+
+  // Otherwise Hours
+  return repeatAfter.inHours;
+}

test/parse_repeat_after_test.dart

@@ -0,0 +1,46 @@
+import 'package:test/test.dart';
+import 'package:vikunja_app/utils/repeat_after_parse.dart';
+
+void main() {
+  test('Repeat after hours', () {
+    Duration testDuration = Duration(hours: 6);
+
+    expect(getRepeatAfterTypeFromDuration(testDuration), 'Hours');
+    expect(getRepeatAfterValueFromDuration(testDuration), 6);
+  });
+
+  test('Repeat after days', () {
+    Duration testDuration = Duration(days: 6);
+
+    expect(getRepeatAfterTypeFromDuration(testDuration), 'Days');
+    expect(getRepeatAfterValueFromDuration(testDuration), 6);
+  });
+
+  test('Repeat after weeks', () {
+    Duration testDuration = Duration(days: 6 * 7);
+
+    expect(getRepeatAfterTypeFromDuration(testDuration), 'Weeks');
+    expect(getRepeatAfterValueFromDuration(testDuration), 6);
+  });
+
+  test('Repeat after months', () {
+    Duration testDuration = Duration(days: 6 * 30);
+
+    expect(getRepeatAfterTypeFromDuration(testDuration), 'Months');
+    expect(getRepeatAfterValueFromDuration(testDuration), 6);
+  });
+
+  test('Repeat after years', () {
+    Duration testDuration = Duration(days: 6 * 365);
+
+    expect(getRepeatAfterTypeFromDuration(testDuration), 'Years');
+    expect(getRepeatAfterValueFromDuration(testDuration), 6);
+  });
+
+  test('Repeat null value', () {
+    Duration testDuration = Duration();
+
+    expect(getRepeatAfterTypeFromDuration(testDuration), null);
+    expect(getRepeatAfterValueFromDuration(testDuration), null);
+  });
+}