create extension function for datetime format

lib/ui/home_page.dart

@@ -4,6 +4,7 @@ import 'package:functional_data/functional_data.dart';
 import 'package:google_fonts/google_fonts.dart';
 import 'package:happy_holidays/model/national_holiday.dart';
 import 'package:provider/provider.dart';
+import 'package:happy_holidays/utils/date_time_extensions.dart';
 
 import 'flag_rounded_image.dart';
 
@@ -86,7 +87,7 @@ class AnimatedHolidayPage extends StatelessWidget {
               child: Opacity(
                 opacity: animation.opacityDateAnimation.value,
                 child: Text(
-                  '${holiday.date.day} - ${holiday.date.month} - ${holiday.date.year}',
+                  holiday.date.simpleDateTimeEuropean(),
                   style: GoogleFonts.kavoon(fontSize: 34.0),
                 ),
               ),

lib/utils/date_time_extensions.dart

@@ -0,0 +1,4 @@
+extension DateTimeExtended on DateTime {
+  String simpleDateTimeEuropean() => '$day-$month-$year';
+  String simpleDateTimeUS() => '$year-$month-$day';
+}

pubspec.yaml

@@ -5,7 +5,7 @@ description: Just a project to have fun
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.6.0 <3.0.0"
 
 dependencies:
   flutter:

test/db/db_middleware_test.dart

@@ -5,7 +5,7 @@ import 'package:happy_holidays/model/national_holiday.dart';
 import 'package:happy_holidays/redux/actions.dart';
 import 'package:mockito/mockito.dart';
 
-import '../utils/stubs.dart';
+import '../test_utils/stubs.dart';
 
 class _MockDatabase extends Mock implements HolidayDatabase {}
 

test/db/holiday_db_test.dart

@@ -19,48 +19,35 @@ void main() {
       test('It inserts holidays', () async {
         when(db.insert(any, any)).thenAnswer((_) => Future.value(0));
 
-        final holiday1 =
-            NationalHoliday(name: 'test', date: DateTime(2020, 1, 1));
+        final holiday1 = NationalHoliday(name: 'test', date: DateTime(2020, 1, 1));
         final holiday2 = NationalHoliday.testinstance();
         await sut.addHolidays([holiday1, holiday2]);
 
-        verify(db.insert('holidays',
-                <String, dynamic>{'name': holiday1.name, 'date': 1577833200000},
+        verify(db.insert('holidays', <String, dynamic>{'name': holiday1.name, 'dateEpoch': 1577833200000},
                 conflictAlgorithm: ConflictAlgorithm.replace))
             .called(1);
 
-        verify(db.insert('holidays',
-                <String, dynamic>{'name': holiday2.name, 'date': 1546297200000},
-                nullColumnHack: null,
-                conflictAlgorithm: ConflictAlgorithm.replace))
+        verify(db.insert('holidays', <String, dynamic>{'name': holiday2.name, 'dateEpoch': 1546297200000},
+                nullColumnHack: null, conflictAlgorithm: ConflictAlgorithm.replace))
             .called(1);
       });
     });
 
     group('Query database', () {
       test('It converts contents to holidays in case db has value', () async {
         when(db.query('holidays')).thenAnswer((_) => Future.value([
-              <String, Object>{
-                'name': 'holiday from db',
-                'date': 1577833200000
-              },
-              <String, Object>{
-                'name': 'holidaynot to be shown',
-                'date': 1546297200000
-              },
+              <String, Object>{'name': 'holiday from db', 'dateEpoch': 1577833200000},
+              <String, Object>{'name': 'holidaynot to be shown', 'dateEpoch': 1546297200000},
             ]));
 
-        expect(await sut.retrieveHolidays(DateTime(2019, 12, 31)), [
-          NationalHoliday(name: 'holiday from db', date: DateTime(2020, 1, 1))
-        ]);
+        expect(await sut.retrieveHolidays(DateTime(2019, 12, 31)),
+            [NationalHoliday(name: 'holiday from db', date: DateTime(2020, 1, 1))]);
       });
 
       test('It returns empty iterable in case db is empty', () async {
-        when(db.query('holidays'))
-            .thenAnswer((_) => Future.value([<String, String>{}]));
+        when(db.query('holidays')).thenAnswer((_) => Future.value([<String, String>{}]));
 
-        expect(await sut.retrieveHolidays(DateTime(2019, 12, 31)),
-            <NationalHoliday>[]);
+        expect(await sut.retrieveHolidays(DateTime(2019, 12, 31)), <NationalHoliday>[]);
       });
     });
   });

test/redux/app_middleware_test.dart

@@ -4,7 +4,7 @@ import 'package:happy_holidays/redux/actions.dart';
 import 'package:happy_holidays/redux/app_middleware.dart';
 import 'package:mockito/mockito.dart';
 
-import '../utils/stubs.dart';
+import '../test_utils/stubs.dart';
 
 class _MockDispatcher extends Mock implements Dispatcher {}
 

test/utils/date_time_extensions_test.dart

@@ -0,0 +1,14 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:happy_holidays/utils/date_time_extensions.dart';
+
+void main() {
+  final dateTime = DateTime(2020, 1, 1);
+
+  test('European dateformat', () {
+    expect(dateTime.simpleDateTimeEuropean(), '1-1-2020');
+  });
+
+  test('US dateformat', () {
+    expect(dateTime.simpleDateTimeUS(), '2020-1-1');
+  });
+}