Add tests for allowClear, clearIcon, InputType modes, onChanged, reset, and initialTime for FormBuilderDateTimePicker

Author: majumdersubhanu

test/src/fields/form_builder_date_time_picker_test.dart

@@ -197,6 +197,183 @@ void main() {
         );
       });
     });
+
+    testWidgets('allowClear properly clears value', (WidgetTester tester) async {
+      const widgetName = 'fdtp_clear';
+      final widgetKey = UniqueKey();
+      final initialDate = DateTime(2023, 1, 1);
+
+      final testWidget = FormBuilderDateTimePicker(
+        key: widgetKey,
+        name: widgetName,
+        initialValue: initialDate,
+        allowClear: true,
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      expect(formInstantValue(widgetName), initialDate);
+      expect(find.byIcon(Icons.clear), findsOneWidget);
+
+      await tester.tap(find.byIcon(Icons.clear));
+      await tester.pumpAndSettle();
+
+      expect(formInstantValue(widgetName), isNull);
+      expect(find.byIcon(Icons.clear), findsNothing);
+    });
+
+    testWidgets('custom clearIcon is rendered', (WidgetTester tester) async {
+      const widgetName = 'fdtp_custom_clear';
+      final initialDate = DateTime(2023, 1, 1);
+      const customIcon = Icons.delete;
+
+      final testWidget = FormBuilderDateTimePicker(
+        name: widgetName,
+        initialValue: initialDate,
+        allowClear: true,
+        clearIcon: const Icon(customIcon),
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      expect(find.byIcon(customIcon), findsOneWidget);
+      expect(find.byIcon(Icons.clear), findsNothing);
+    });
+
+    testWidgets('InputType.date returns midnight time', (WidgetTester tester) async {
+      const widgetName = 'fdtp_date_only';
+      final widgetKey = UniqueKey();
+      final dateNow = DateTime.now();
+      const confirmText = 'OK';
+
+      final testWidget = FormBuilderDateTimePicker(
+        key: widgetKey,
+        name: widgetName,
+        inputType: InputType.date,
+        confirmText: confirmText,
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      await tester.tap(find.byKey(widgetKey));
+      await tester.pumpAndSettle();
+
+      final testDay = dateNow.day - 1 <= 0 ? dateNow.day + 1 : dateNow.day - 1;
+      await tester.tap(find.text(testDay.toString()));
+      await tester.pumpAndSettle();
+      await tester.tap(find.text(confirmText));
+      await tester.pumpAndSettle();
+
+      expect(formSave(), isTrue);
+      expect(
+        formValue<DateTime>(widgetName),
+        DateTime(dateNow.year, dateNow.month, testDay),
+      );
+    });
+
+    testWidgets('InputType.time returns DateTime(1, 1, 1) with time',
+        (WidgetTester tester) async {
+      const widgetName = 'fdtp_time_only';
+      final widgetKey = UniqueKey();
+      const confirmText = 'OK';
+
+      final testWidget = FormBuilderDateTimePicker(
+        key: widgetKey,
+        name: widgetName,
+        inputType: InputType.time,
+        confirmText: confirmText,
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      await tester.tap(find.byKey(widgetKey));
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text(confirmText));
+      await tester.pumpAndSettle();
+
+      expect(formSave(), isTrue);
+      final value = formValue<DateTime>(widgetName);
+      expect(value!.year, 1);
+      expect(value.month, 1);
+      expect(value.day, 1);
+      expect(value.hour, 12); // Default initialTime is 12:00
+      expect(value.minute, 0);
+    });
+
+    testWidgets('onChanged is called when value changes', (WidgetTester tester) async {
+      const widgetName = 'fdtp_onChanged';
+      int changedCount = 0;
+      DateTime? valueFromOnChanged;
+
+      final testWidget = FormBuilderDateTimePicker(
+        name: widgetName,
+        allowClear: true,
+        initialValue: DateTime(2023, 1, 1),
+        onChanged: (val) {
+          changedCount++;
+          valueFromOnChanged = val;
+        },
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      await tester.tap(find.byIcon(Icons.clear));
+      await tester.pumpAndSettle();
+
+      expect(changedCount, 1);
+      expect(valueFromOnChanged, isNull);
+    });
+
+    testWidgets('reset() reverts value to initialValue', (WidgetTester tester) async {
+      const widgetName = 'fdtp_reset';
+      final initialDate = DateTime(2023, 1, 1);
+
+      final testWidget = FormBuilderDateTimePicker(
+        name: widgetName,
+        initialValue: initialDate,
+        allowClear: true,
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      await tester.tap(find.byIcon(Icons.clear));
+      await tester.pumpAndSettle();
+      expect(formInstantValue(widgetName), isNull);
+
+      formKey.currentState!.fields[widgetName]!.reset();
+      await tester.pumpAndSettle();
+
+      expect(formInstantValue(widgetName), initialDate);
+    });
+
+    testWidgets('initialTime is respected for InputType.both', (WidgetTester tester) async {
+      const widgetName = 'fdtp_initialTime';
+      final widgetKey = UniqueKey();
+      const confirmText = 'OK';
+      final initialTime = const TimeOfDay(hour: 15, minute: 30);
+
+      final testWidget = FormBuilderDateTimePicker(
+        key: widgetKey,
+        name: widgetName,
+        inputType: InputType.both,
+        confirmText: confirmText,
+        initialTime: initialTime,
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      await tester.tap(find.byKey(widgetKey));
+      await tester.pumpAndSettle();
+
+      // Date picker OK
+      await tester.tap(find.text(DateTime.now().day.toString()));
+      await tester.pumpAndSettle();
+      await tester.tap(find.text(confirmText));
+      await tester.pumpAndSettle();
+
+      // Time picker should show 15:30.
+      await tester.tap(find.text(confirmText));
+      await tester.pumpAndSettle();
+
+      expect(formSave(), isTrue);
+      final value = formValue<DateTime>(widgetName);
+      expect(value!.hour, 15);
+      expect(value.minute, 30);
+    });
   });
 
   testWidgets('When press tab, field will be focused', (