New Example - Calendar (#91)

flutter_date_pickers-master/test/range_selectable_test.dart

@@ -0,0 +1,55 @@
+import 'package:flutter_date_pickers/flutter_date_pickers.dart';
+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("RangeSelectable test.", () {
+    test("getDayType() returns correct type for different dates", () {
+      final now = DateTime.now();
+      final startPeriod = now.subtract(const Duration(days: 3));
+      final endPeriod = now.add(const Duration(days: 3));
+      final selectedPeriod = DatePeriod(startPeriod, endPeriod);
+
+      final firstDate = now.subtract(const Duration(days: 10));
+      final lastDate = now.add(const Duration(days: 10));
+      final disabledDate = now.subtract(const Duration(days: 5));
+
+      // ignore: prefer_function_declarations_over_variables
+      final selectablePredicate = (DateTime d)
+        => !DateTimeUtils.sameDate(d, disabledDate);
+
+      final selectableLogic = RangeSelectable(
+          selectedPeriod, firstDate, lastDate,
+          selectableDayPredicate: selectablePredicate);
+
+      final notSelectedEnabledDateType = selectableLogic.getDayType(firstDate);
+      expect(notSelectedEnabledDateType, DayType.notSelected);
+
+      final disabledDateType = selectableLogic.getDayType(disabledDate);
+      expect(disabledDateType, DayType.disabled);
+
+      final startPeriodDateType = selectableLogic.getDayType(startPeriod);
+      expect(startPeriodDateType, DayType.start);
+
+      final endPeriodDateType = selectableLogic.getDayType(endPeriod);
+      expect(endPeriodDateType, DayType.end);
+
+      final periodDays = endPeriod.difference(startPeriod).inDays;
+
+      // Count of the day period which is not start and not end.
+      final middleDaysCount = periodDays - 2;
+      final middleDates = List.generate(middleDaysCount,
+              (i) => startPeriod.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 period ${startPeriod.toString()} - ${endPeriod.toString()}");
+      }
+    });
+  });
+}