test: Add FormBuilderDateTimePicker tests

Author: deandreamatias

test/src/fields/form_builder_date_time_picker_test.dart

@@ -0,0 +1,128 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_form_builder/flutter_form_builder.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../../form_builder_tester.dart';
+
+void main() {
+  group('FormBuilderDateTimePicker --', () {
+    testWidgets('basic', (WidgetTester tester) async {
+      const widgetName = 'fdtp1';
+      final widgetKey = UniqueKey();
+      final dateNow = DateTime.now();
+      const confirmText = 'OK';
+      const cancelText = 'CANCEL';
+
+      final testWidget = FormBuilderDateTimePicker(
+        key: widgetKey,
+        name: widgetName,
+        confirmText: confirmText,
+        cancelText: cancelText,
+      );
+      await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+      expect(formSave(), isTrue);
+      expect(formValue(widgetName), equals(null));
+      await tester.tap(find.byKey(widgetKey));
+      await tester.pumpAndSettle();
+      expect(find.text(confirmText), findsOneWidget);
+      expect(find.text(cancelText), findsOneWidget);
+
+      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();
+      await tester.tap(find.text(confirmText));
+      await tester.pumpAndSettle();
+
+      expect(formSave(), isTrue);
+      expect(formValue<DateTime>(widgetName),
+          DateTime(dateNow.year, dateNow.month, testDay, 12));
+    });
+    group('initial value -', () {
+      testWidgets('to FormBuilder', (WidgetTester tester) async {
+        const widgetName = 'fdtp2';
+        final widgetKey = UniqueKey();
+        final dateFuture = DateTime.now().add(const Duration(days: 10));
+        const confirmText = 'OK';
+        const cancelText = 'CANCEL';
+
+        final testWidget = FormBuilderDateTimePicker(
+          key: widgetKey,
+          name: widgetName,
+          confirmText: confirmText,
+          cancelText: cancelText,
+        );
+
+        await tester.pumpWidget(buildTestableFieldWidget(
+          testWidget,
+          initialValue: {widgetName: dateFuture},
+        ));
+
+        expect(formSave(), isTrue);
+        expect(formValue(widgetName), dateFuture);
+        await tester.tap(find.byKey(widgetKey));
+        await tester.pumpAndSettle();
+        expect(find.text(confirmText), findsOneWidget);
+        expect(find.text(cancelText), findsOneWidget);
+
+        final testDay =
+            dateFuture.day - 1 <= 0 ? dateFuture.day + 1 : dateFuture.day - 1;
+        await tester.tap(find.text(testDay.toString()));
+        await tester.pumpAndSettle();
+        await tester.tap(find.text(confirmText));
+        await tester.pumpAndSettle();
+        await tester.tap(find.text(confirmText));
+        await tester.pumpAndSettle();
+
+        expect(formSave(), isTrue);
+        expect(
+          formValue<DateTime>(widgetName),
+          DateTime(dateFuture.year, dateFuture.month, testDay, dateFuture.hour,
+              dateFuture.minute, 0, 0),
+        );
+      });
+      testWidgets('to Widget', (WidgetTester tester) async {
+        const widgetName = 'fdtp3';
+        final widgetKey = UniqueKey();
+        final datePast = DateTime.now().subtract(const Duration(days: 10));
+        const confirmText = 'OK';
+        const cancelText = 'CANCEL';
+
+        final testWidget = FormBuilderDateTimePicker(
+          key: widgetKey,
+          name: widgetName,
+          confirmText: confirmText,
+          cancelText: cancelText,
+          initialValue: datePast,
+        );
+
+        await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+        expect(formSave(), isTrue);
+        expect(formValue(widgetName), datePast);
+        await tester.tap(find.byKey(widgetKey));
+        await tester.pumpAndSettle();
+        expect(find.text(confirmText), findsOneWidget);
+        expect(find.text(cancelText), findsOneWidget);
+
+        final testDay =
+            datePast.day - 1 <= 0 ? datePast.day + 1 : datePast.day - 1;
+        await tester.tap(find.text(testDay.toString()));
+        await tester.pumpAndSettle();
+        await tester.tap(find.text(confirmText));
+        await tester.pumpAndSettle();
+        await tester.tap(find.text(confirmText));
+        await tester.pumpAndSettle();
+
+        expect(formSave(), isTrue);
+        expect(
+          formValue<DateTime>(widgetName),
+          DateTime(datePast.year, datePast.month, testDay, datePast.hour,
+              datePast.minute, 0, 0),
+        );
+      });
+    });
+  });
+}