Add initial unit tests; enhance Chart and Milestone widgets

lib/main.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_application_1/calculator.dart';
 import 'package:flutter_application_1/enums.dart';
-import 'package:flutter_application_1/translations.dart';
 import 'package:flutter_application_1/utils.dart';
 import 'package:flutter_application_1/widgets/input_widget.dart';
 import 'package:flutter_application_1/widgets/interval_widget.dart';

lib/translations.dart

@@ -1,10 +0,0 @@
-import 'package:flutter_application_1/enums.dart';
-
-String translateInterval(PayoutInterval interval) {
-  switch (interval) {
-    case PayoutInterval.yearly:
-      return 'jährlich';
-    case PayoutInterval.monthly:
-      return 'monatlich';
-  }
-}

lib/utils.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_application_1/enums.dart';
 
 // Rundet den Wert im Textfeld-Controller auf die nächste ganze Zahl
 void roundToInteger(TextEditingController controller) {
@@ -20,3 +21,12 @@ void restoreDefaultValuesIfEmpty(TextEditingController controller) {
     controller.text = '0';
   }
 }
+
+String translateInterval(PayoutInterval interval) {
+  switch (interval) {
+    case PayoutInterval.yearly:
+      return 'jährlich';
+    case PayoutInterval.monthly:
+      return 'monatlich';
+  }
+}

lib/widgets/chart_widget.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
 import 'package:syncfusion_flutter_charts/charts.dart';
 
 // Widget zur Erstellung eines gestapelten Säulendiagramms
@@ -79,3 +80,155 @@ class SalesData {
 
   SalesData(this.year, this.value);
 }
+
+// Widget, welches das Diagramm auf eine neue Seite auslagert
+@override  
+Widget buildChartPage(BuildContext context, List<double> investedMoneyList, List<double> compoundInterestList) {
+  return Scaffold(
+    body: CustomScrollView(
+      slivers: <Widget>[
+        SliverToBoxAdapter(
+          child: Container(
+            padding: EdgeInsets.only(left: 10, right: 10, top: MediaQuery.of(context).padding.top + 10),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: [
+                IconButton(
+                  icon: const Icon(CupertinoIcons.chevron_left, size: 15), // Zurück-Pfeil
+                  onPressed: () {
+                    Navigator.pop(context);
+                  },
+                ),
+                const Text(
+                  'Grafik',
+                  style: TextStyle(fontWeight: FontWeight.bold),
+                ),
+                const SizedBox(width: 40), // Platzhalter für zentrierte Ausrichtung
+              ],
+            ),
+           ),
+          ),
+        SliverToBoxAdapter( // Diagramm Anzeigen
+          child: Padding(
+            padding: const EdgeInsets.all(10.0),
+            child: StackedColumnChart(
+                lowerValues: investedMoneyList,
+                upperValues: compoundInterestList,
+              ),
+          ),
+        ),
+        SliverToBoxAdapter( // Tabelle mit allen Werten anzeigen
+          child: Padding(
+            padding: const EdgeInsets.all(10.0),
+            child: Container(
+              decoration: BoxDecoration(
+                color: CupertinoColors.black,
+                borderRadius: BorderRadius.circular(5),
+              ),
+              clipBehavior: Clip.antiAlias,
+              child: Table(
+                columnWidths: const {
+                  0: FixedColumnWidth(60), // Spaltenbreite für die erste Spalte verringern
+                  1: FlexColumnWidth(),
+                  2: FlexColumnWidth(),
+                  3: FlexColumnWidth(),
+                },
+                border: TableBorder.symmetric(
+                  inside: const BorderSide(color: CupertinoColors.white, width: 1),
+                ),
+                children: [
+                  const TableRow(
+                    decoration: BoxDecoration(color: CupertinoColors.darkBackgroundGray),
+                    children: [
+                      Padding(
+                        padding: EdgeInsets.all(8.0),
+                        child: Text(
+                          'Jahr',
+                          style: TextStyle(
+                            color: CupertinoColors.white,
+                            fontWeight: FontWeight.bold,
+                          ),
+                          textAlign: TextAlign.center,
+                        ),
+                      ),
+                      Padding(
+                        padding: EdgeInsets.all(8.0),
+                        child: Text(
+                          'Einzahlungen',
+                          style: TextStyle(
+                            color: CupertinoColors.white,
+                            fontWeight: FontWeight.bold,
+                          ),
+                          textAlign: TextAlign.center,
+                        ),
+                      ),
+                      Padding(
+                        padding: EdgeInsets.all(8.0),
+                        child: Text(
+                          'Zinsen',
+                          style: TextStyle(
+                            color: CupertinoColors.white,
+                            fontWeight: FontWeight.bold,
+                          ),
+                          textAlign: TextAlign.center,
+                        ),
+                      ),
+                      Padding(
+                        padding: EdgeInsets.all(8.0),
+                        child: Text(
+                          'Endkapital',
+                          style: TextStyle(
+                            color: CupertinoColors.white,
+                            fontWeight: FontWeight.bold,
+                          ),
+                          textAlign: TextAlign.center,
+                        ),
+                      ),
+                    ],
+                  ),
+                  for (int i = 0; i < investedMoneyList.length; i++)
+                    TableRow(
+                      children: [
+                        Padding(
+                          padding: const EdgeInsets.all(8.0),
+                          child: Text(
+                            '${i + 1}',
+                            style: const TextStyle(color: CupertinoColors.white),
+                            textAlign: TextAlign.center,
+                          ),
+                        ),
+                        Padding(
+                          padding: const EdgeInsets.all(8.0),
+                          child: Text(
+                            '€${investedMoneyList[i]}',
+                            style: const TextStyle(color: CupertinoColors.white),
+                            textAlign: TextAlign.center,
+                          ),
+                        ),
+                        Padding(
+                          padding: const EdgeInsets.all(8.0),
+                          child: Text(
+                            '€${compoundInterestList[i]}',
+                            style: const TextStyle(color: CupertinoColors.white),
+                            textAlign: TextAlign.center,
+                          ),
+                        ),
+                        Padding(
+                          padding: const EdgeInsets.all(8.0),
+                          child: Text(
+                            '€${compoundInterestList[i] + investedMoneyList[i]}',
+                            style: const TextStyle(color: CupertinoColors.white),
+                            textAlign: TextAlign.center,
+                          ),
+                        ),
+                      ],
+                    ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ],
+    ),
+  );
+}

lib/widgets/interval_widget.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_application_1/enums.dart';
-import 'package:flutter_application_1/translations.dart';
+import 'package:flutter_application_1/utils.dart';
 
 class IntervalWidget extends StatefulWidget {
   final String selectedInterval;

lib/widgets/milestone_timeline_widget.dart

@@ -1,6 +1,7 @@
-// Erstellt eine Zeitleiste für Meilensteine
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
 
+// Erstellt eine Zeitleiste für Meilensteine
 Widget buildMilestoneTimeline(List<Map<String, dynamic>> milestones, double totalInterest) {
   return SizedBox(
     child: Center(
@@ -50,3 +51,41 @@ Widget buildMilestoneTimeline(List<Map<String, dynamic>> milestones, double tota
     ),
   );
 }
+
+// Widget, welches den Meilenstein-Zeitstrahl auf eine neue Seite auslagert
+@override  
+Widget buildMilestonePage(BuildContext context, String compoundInterest, String investedMoney, List<Map<String, dynamic>> milestoneList) {
+  return Scaffold(
+    body: CustomScrollView(
+      slivers: <Widget>[
+        SliverToBoxAdapter(
+          child: Container(
+            padding: EdgeInsets.only(left: 10, right: 10, top: MediaQuery.of(context).padding.top + 10),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: [
+                IconButton(
+                  icon: const Icon(CupertinoIcons.chevron_left, size: 15), // Zurück-Pfeil
+                  onPressed: () {
+                    Navigator.pop(context);
+                  },
+                ),
+                const Text(
+                  'Grafik',
+                  style: TextStyle(fontWeight: FontWeight.bold),
+                ),
+                const SizedBox(width: 40), // Platzhalter für zentrierte Ausrichtung
+              ],
+            ),
+           ),
+          ),
+        SliverToBoxAdapter( // Meilenstein-Zeitstrahl anzeigen
+          child: Padding(
+            padding: const EdgeInsets.all(10.0),
+            child: buildMilestoneTimeline(milestoneList, double.parse(compoundInterest) - double.parse(investedMoney))
+          ),
+        ),
+      ],
+    ),
+  );
+}

lib/widgets/result_widget.dart

@@ -1,8 +1,7 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_application_1/enums.dart';
-import 'package:flutter_application_1/translations.dart';
+import 'package:flutter_application_1/utils.dart';
-import 'package:flutter_application_1/widgets/second_page_widget.dart';
 import 'package:flutter_application_1/widgets/custom_image_button_widget.dart';
 import 'package:flutter_application_1/widgets/chart_widget.dart';
 import 'package:flutter_application_1/widgets/milestone_timeline_widget.dart';
@@ -20,18 +19,20 @@ Widget buildResultWidget(BuildContext context, String compoundInterest, String i
   
   return Column(
     children: <Widget>[
+      _buildResultRow('Endkapital:', '$compoundInterest€'),
+      _buildResultRow('Einzahlungen:', '$investedMoney€'),
+      _buildResultRow('Erhaltene Zinsen:', '${double.parse(compoundInterest) + double.parse(investedMoney)}€'),
+      const SizedBox(height: 10),
+      Text(
+        'Wenn du über einen Zeitraum von $time Jahren ${translateInterval(payoutInterval)} $monthlySavingsRate€ mit einem Zinssatz von $interestRate% investierst, erreichst du am Ende ein Endkapital von $compoundInterest€. Dieses setzt sich aus Einzahlungen von $investedMoney€ und Zinsen bzw. Kapitalerträgen in Höhe von ${double.parse(compoundInterest) - double.parse(investedMoney)}€ zusammen.'
+      ),
+      const SizedBox(height: 20),
       CustomImageButton(
         onPressed: () {
           Navigator.push(
             context,
             MaterialPageRoute(
-              builder: (context) => SecondPage(
+              builder: (context) => buildChartPage(context, investedMoneyList, compoundInterestList),
-                title: 'Grafik',
-                widgetToShow: StackedColumnChart(
-                  lowerValues: investedMoneyList,
-                  upperValues: compoundInterestList,
-                )
-              ),
             ),
           );
         },
@@ -47,10 +48,7 @@ Widget buildResultWidget(BuildContext context, String compoundInterest, String i
           Navigator.push(
             context,
             MaterialPageRoute(
-              builder: (context) => SecondPage(
+              builder: (context) => buildMilestonePage(context, compoundInterest, investedMoney, milestoneList),
-                title: 'Meilensteine',
-                widgetToShow: buildMilestoneTimeline(milestoneList, double.parse(compoundInterest) - double.parse(investedMoney))
-              ),
             ),
           );
         },
@@ -60,14 +58,6 @@ Widget buildResultWidget(BuildContext context, String compoundInterest, String i
           style: TextStyle(color: CupertinoColors.white, fontSize: 20),
         ),
       ),
-      const SizedBox(height: 20),
-      _buildResultRow('Endkapital:', '$compoundInterest€'),
-      _buildResultRow('Einzahlungen:', '$investedMoney€'),
-      _buildResultRow('Erhaltene Zinsen:', '${double.parse(compoundInterest) - double.parse(investedMoney)}€'),
-      const SizedBox(height: 10),
-      Text(
-        'Wenn du über einen Zeitraum von $time Jahren ${translateInterval(payoutInterval)} $monthlySavingsRate€ mit einem Zinssatz von $interestRate% investierst, erreichst du am Ende ein Endkapital von $compoundInterest€. Dieses setzt sich aus Einzahlungen von $investedMoney€ und Zinsen bzw. Kapitalerträgen in Höhe von ${double.parse(compoundInterest) - double.parse(investedMoney)}€ zusammen.'
-      ),
     ],
   );
   

lib/widgets/second_page_widget.dart

@@ -1,50 +0,0 @@
-import 'package:flutter/cupertino.dart';
-import 'package:flutter/material.dart';
-
-class SecondPage extends StatelessWidget {
-  final String title;
-  final Widget widgetToShow;
-
-  const SecondPage({
-    super.key, 
-    required this.title, 
-    required this.widgetToShow
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      body: CustomScrollView(
-        slivers: <Widget>[
-          SliverToBoxAdapter(
-            child: Container(
-              padding: EdgeInsets.only(left: 10, right: 10, top: MediaQuery.of(context).padding.top + 10),
-              child: Row(
-                mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                children: [
-                  IconButton(
-                    icon: const Icon(CupertinoIcons.chevron_left, size: 15), // Zurück-Pfeil
-                    onPressed: () {
-                      Navigator.pop(context);
-                    },
-                  ),
-                  Text(
-                    title,
-                    style: const TextStyle(fontWeight: FontWeight.bold),
-                  ),
-                  const SizedBox(width: 40), // Platzhalter für zentrierte Ausrichtung
-                ],
-              ),
-            ),
-          ),
-          SliverToBoxAdapter(
-            child: Padding(
-              padding: const EdgeInsets.all(10.0),
-              child: widgetToShow, // Anzeigen des mitgegebenen Widgets
-            ),
-          ),
-        ],
-      ),
-    );
-  }
-}

test/unit_test.dart

@@ -0,0 +1,44 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_application_1/enums.dart';
+import 'package:flutter_application_1/calculator.dart';
+
+void main() {
+  group('Calculation Tests', () {
+    test('Test calculateInvestedMoney function', () {
+      // Testen mit verschiedenen Eingabewerten
+      expect(calculateInvestedMoney(1000, 100, 5, []), equals(7000.0));
+      expect(calculateInvestedMoney(2000, 50, 10, []), equals(8000.0));
+    });
+    test('Test calculateCompoundInterest function', () {
+      // Testen mit jährlicher Auszahlung
+      List<double> investedMoneyListYearly = [];
+      List<double> compoundInterestListYearly = [];
+      calculateInvestedMoney(1000, 100, 10, investedMoneyListYearly);
+      expect(calculateCompoundInterest(1000, 100, 5, 10, PayoutInterval.yearly, investedMoneyListYearly, compoundInterestListYearly), equals(16722.0));
+
+      // Testen mit monatlicher Auszahlung
+      List<double> investedMoneyListMonthly = [];
+      List<double> compoundInterestListMonthly = [];
+      calculateInvestedMoney(2000, 50, 10, investedMoneyListMonthly);
+      expect(calculateCompoundInterest(2000, 50, 5, 10, PayoutInterval.monthly, investedMoneyListMonthly, compoundInterestListMonthly), equals(11058.0));
+    });
+  });
+  group('Edge Case Tests', () {
+    test('Test calculateInvestedMoney function with extremely high input values', () {
+      // Testen mit extrem hohen Eingabewerten
+      expect(calculateInvestedMoney(1e15, 1e12, 100, []), equals(2.2e15));
+    });
+    test('Test calculateInvestedMoney function with extremely low input values', () {
+      // Testen mit extrem niedrigen Eingabewerten
+      expect(calculateInvestedMoney(0, 0, 0, []), equals(0.0));
+      expect(calculateInvestedMoney(0.1, 0.01, 0.001, []), equals(0.0));
+    });
+    test('Test calculateCompoundInterest function with extremely high interest rate', () {
+      // Testen mit extrem hohen Zinssatz
+      List<double> investedMoneyListHighInterest = [];
+      List<double> compoundInterestListHighInterest = [];
+      calculateInvestedMoney(1000, 100, 10, investedMoneyListHighInterest);
+      expect(calculateCompoundInterest(1000, 100, 1000, 10, PayoutInterval.yearly, investedMoneyListHighInterest, compoundInterestListHighInterest), equals(29049915553000.0));
+    });
+  });
+}

test/widget_test.dart

@@ -0,0 +1 @@
+import 'package:flutter_test/flutter_test.dart';