New Example - Calendar (#91)

flutter_date_pickers-master/test/week_selectabl_test.dart

@@ -0,0 +1,56 @@
+import 'package:flutter_date_pickers/src/day_type.dart';
+import 'package:flutter_date_pickers/src/i_selectable_picker.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'date_time_utils.dart';
+
+void main() {
+  group("WeekSelectable test.", () {
+    test("getDayType() returns correct type for different dates", () {
+      final selectedDate = DateTime(2020, 10, 5); // Monday
+      final firstDayOfWeekIndex = 1; // Week starts from Monday
+
+      final firstDate = selectedDate.subtract(const Duration(days: 10));
+      final lastDate = selectedDate.add(const Duration(days: 10));
+      final disabledDate = selectedDate.subtract(const Duration(days: 5));
+
+      // ignore: prefer_function_declarations_over_variables
+      final selectablePredicate = (DateTime d)
+      => !DateTimeUtils.sameDate(d, disabledDate);
+
+      final selectableLogic = WeekSelectable(
+          selectedDate, firstDayOfWeekIndex, firstDate, lastDate,
+          selectableDayPredicate: selectablePredicate);
+
+      final notSelectedEnabledDateType = selectableLogic.getDayType(firstDate);
+      expect(notSelectedEnabledDateType, DayType.notSelected);
+
+      final disabledDateType = selectableLogic.getDayType(disabledDate);
+      expect(disabledDateType, DayType.disabled);
+
+      final weekStart = DateTimeUtils
+          .getFirstDayOfWeek(selectedDate, firstDayOfWeekIndex);
+
+      final weekEnd = DateTimeUtils
+          .getLastDayOfWeek(selectedDate, firstDayOfWeekIndex);
+
+      final startPeriodDateType = selectableLogic.getDayType(weekStart);
+      expect(startPeriodDateType, DayType.start);
+
+      final endPeriodDateType = selectableLogic.getDayType(weekEnd);
+      expect(endPeriodDateType, DayType.end);
+
+      // Count of the week days which is not start and not end (7 - 2).
+      final middleDaysCount = 5;
+      final middleDates = List.generate(middleDaysCount,
+              (i) => weekStart.add(Duration(days: i + 1)));
+
+      for (DateTime date in middleDates) {
+        final middlePeriodDateType = selectableLogic.getDayType(date);
+        expect(middlePeriodDateType, DayType.middle,
+            reason: "Incorrect DayType for the date ${date.toString()} "
+                "in week ${weekStart.toString()} - ${weekEnd.toString()}");
+      }
+    });
+  });
+}