Feature/widget testing (#8)

* Configured iOS Build
* Created ProgressListTile widget
* Created MaterialTesterWidget
* Created String Methods for Testing in ProgressListTile
* Created ProgressListTileStrings class
* Using Progress List Tile
* Created Progress List View
* Created Progress List Tile currently, future and past test.
* Created Progress List View one and five Time Progresses test.

Signed-off-by: Andreas Fahrecker <AndreasFahrecker@gmail.com>

lib/models/app_exceptions.dart

@@ -14,5 +14,18 @@ class TimeProgressStartTimeIsNotBeforeEndTimeException implements Exception {
       this.startTime, this.endTime);
 
   String errMsg() =>
-      "The Start Time has to be before the end time. Therefore these values are invalid: Start Time: $startTime EndTime: $endTime";
+      "The Start Time has to be before the end time. Therefore these values are"
+      " invalid: Start Time: $startTime EndTime: $endTime";
+}
+
+class TimeProgressHasStartedException implements Exception {
+  String errMsg() =>
+      "This TimeProgress has started. Therefore all calculation, which assume, "
+      "that the progress hasn't started yet can't be performed";
+}
+
+class TimeProgressHasNotEndedException implements Exception {
+  String errMsg() =>
+      "This TimeProgress hasn't ended. Therefore all calculation, which assume,"
+      " that the progress has ended already can't be performed";
 }

lib/models/time_progress.dart

@@ -47,9 +47,19 @@ class TimeProgress {
   bool hasStarted() =>
       DateTime.now().millisecondsSinceEpoch > startTime.millisecondsSinceEpoch;
 
+  int daysTillStart() {
+    if (hasStarted()) throw new TimeProgressHasStartedException();
+    return startTime.difference(DateTime.now()).inDays;
+  }
+
   bool hasEnded() =>
       DateTime.now().millisecondsSinceEpoch > endTime.millisecondsSinceEpoch;
 
+  int daysSinceEnd() {
+    if (!hasEnded()) throw new TimeProgressHasNotEndedException();
+    return DateTime.now().difference(endTime).inDays;
+  }
+
   @override
   int get hashCode =>
       id.hashCode ^ name.hashCode ^ startTime.hashCode ^ endTime.hashCode;

lib/widgets/home/home_progress_list_tile.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:percent_indicator/linear_percent_indicator.dart';
 import 'package:time_progress_tracker/models/time_progress.dart';
-import 'package:time_progress_tracker/screens/progress_detail_screen.dart';
+import 'package:time_progress_tracker/widgets/progress_list_view/progress_list_tile.dart';
 
 class HomeProgressListTile extends StatelessWidget {
   final TimeProgress timeProgress;
@@ -16,33 +15,11 @@ class HomeProgressListTile extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    Widget listTileSubTitle;
-    if (timeProgress.hasStarted() && !timeProgress.hasEnded())
-      listTileSubTitle = LinearPercentIndicator(
-        center: Text(
-          "${(timeProgress.percentDone() * 100).floor()} %",
-          style: TextStyle(color: Colors.white),
-        ),
-        percent: timeProgress.percentDone(),
-        progressColor: doneColor,
-        backgroundColor: leftColor,
-        lineHeight: 20,
-      );
-    if (!timeProgress.hasStarted())
-      listTileSubTitle = Text(
-          "Starts in ${timeProgress.startTime.difference(DateTime.now()).inDays} Days");
-    if (timeProgress.hasEnded())
-      listTileSubTitle = Text(
-          "Ended ${DateTime.now().difference(timeProgress.endTime).inDays} Days ago.");
-
     return Card(
-      child: ListTile(
-        title: Text(timeProgress.name),
-        subtitle: listTileSubTitle,
-        onTap: () {
-          Navigator.pushNamed(context, ProgressDetailScreen.routeName,
-              arguments: ProgressDetailScreenArguments(timeProgress.id));
-        },
+      child: ProgressListTile(
+        timeProgress: timeProgress,
+        doneColor: doneColor,
+        leftColor: leftColor,
       ),
     );
   }

lib/widgets/progress_list_view/progress_list_tile.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:percent_indicator/linear_percent_indicator.dart';
+import 'package:time_progress_tracker/models/time_progress.dart';
+
+class ProgressListTileStrings {
+  static String percentString(TimeProgress tp) =>
+      "${(tp.percentDone() * 100).floorToDouble()} %";
+
+  static String startsInDaysString(TimeProgress tp) =>
+      "Starts in ${tp.daysTillStart()} Days.";
+
+  static String endedDaysAgoString(TimeProgress tp) =>
+      "Ended ${tp.daysSinceEnd()} Days ago.";
+}
+
+class ProgressListTile extends StatelessWidget {
+  final TimeProgress timeProgress;
+  final Color doneColor, leftColor;
+
+  ProgressListTile({
+    @required this.timeProgress,
+    @required this.doneColor,
+    @required this.leftColor,
+  });
+
+  Widget _renderSubtitle(BuildContext context) {
+    if (!timeProgress.hasStarted())
+      return Text(ProgressListTileStrings.startsInDaysString(timeProgress));
+    if (timeProgress.hasEnded())
+      return Text(ProgressListTileStrings.endedDaysAgoString(timeProgress));
+    return LinearPercentIndicator(
+      center: Text(ProgressListTileStrings.percentString(timeProgress)),
+      percent: timeProgress.percentDone(),
+      progressColor: doneColor,
+      backgroundColor: leftColor,
+      lineHeight: 20,
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(timeProgress.name),
+      subtitle: _renderSubtitle(context),
+    );
+  }
+}

lib/widgets/progress_list_view/progress_list_view.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:time_progress_tracker/models/time_progress.dart';
+import 'package:time_progress_tracker/widgets/progress_list_view/progress_list_tile.dart';
+
+class ProgressListView extends StatelessWidget {
+  final List<TimeProgress> timeProgressList;
+  final Color doneColor, leftColor;
+
+  ProgressListView({
+    @required this.timeProgressList,
+    @required this.doneColor,
+    @required this.leftColor,
+  });
+
+  List<Widget> _renderListViewChildren() {
+    return timeProgressList.map((e) =>
+        Card(
+          child: ProgressListTile(
+            timeProgress: e,
+            doneColor: doneColor,
+            leftColor: leftColor,
+          ),
+        )
+    ).toList(growable: false);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView(
+      children: _renderListViewChildren(),
+    );
+  }
+}