Pull Request for Unit Tests of edit_agenda_item_page.dart (#2694)

* add remove catergory test case

* adding title and description validation

* removed unused import

* code ai improvement

* fix it

test/views/after_auth_screens/events/edit_agenda_item_page_test.dart

@@ -1,4 +1,5 @@
 // ignore_for_file: talawa_api_doc
+
 import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -139,5 +140,177 @@ void main() {
       await tester.tap(find.text('Add Attachments'));
       await tester.pumpAndSettle();
     });
+
+    testWidgets('Remove a selected category', (WidgetTester tester) async {
+      await tester.pumpWidget(createEditAgendaItemScreen());
+      await tester.pumpAndSettle();
+
+      // Step 1: Select a category
+      await tester.tap(find.byType(DropdownButtonFormField<AgendaCategory>));
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text('Category 1').last);
+      await tester.pumpAndSettle();
+
+      // Verify the category was added
+      expect(find.byKey(const Key('Category 1')), findsOneWidget);
+
+      // Step 2: Remove the selected category
+      await tester.tap(find.byType(DropdownButtonFormField<AgendaCategory>));
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text('Category 1').last);
+      await tester.pumpAndSettle();
+
+      // Verify the category was removed
+      expect(find.byKey(const Key('Category 1')), findsNothing);
+    });
+
+    testWidgets('Chip onDeleted removes a category',
+        (WidgetTester tester) async {
+      await tester.pumpWidget(createEditAgendaItemScreen());
+      await tester.pumpAndSettle();
+
+      // Step 1: Add a category to the selected categories
+      await tester.tap(find.byType(DropdownButtonFormField<AgendaCategory>));
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text('Category 1').last);
+      await tester.pumpAndSettle();
+
+      // Verify the category was added and is displayed as a Chip
+      expect(find.byKey(const Key('Category 1')), findsOneWidget);
+
+      // Step 2: Trigger the onDeleted callback by specifically finding the delete icon
+      final deleteButtonFinder = find.descendant(
+        of: find.byKey(const Key('Category 1')),
+        matching: find.byIcon(
+          Icons.cancel,
+        ), // Adjust to match the delete icon used in the Chip
+      );
+
+      expect(
+        deleteButtonFinder,
+        findsOneWidget,
+      ); // Ensure there's exactly one match
+      await tester.tap(deleteButtonFinder);
+      await tester.pumpAndSettle();
+
+      // Step 3: Verify the category was removed
+      expect(find.byKey(const Key('Category 1')), findsNothing);
+    });
+
+    testWidgets('TextFormField displays error message when input is empty',
+        (WidgetTester tester) async {
+      // Build the widget
+      await tester.pumpWidget(createEditAgendaItemScreen());
+      await tester.pumpAndSettle();
+
+      // Find the TextFormField
+      final textFormField = find.byKey(const Key('edit_event_agenda_duration'));
+      expect(textFormField, findsOneWidget);
+
+      // Simulate user entering empty text
+      await tester.enterText(textFormField, '');
+      await tester.pumpAndSettle();
+
+      // Since we're not using a Form, we need to manually trigger the validator
+      // by accessing the FormFieldState and calling validate()
+      final formFieldState =
+          tester.state<FormFieldState<String>>(textFormField);
+      formFieldState.validate();
+      await tester.pumpAndSettle();
+
+      // Check for the error message
+      expect(find.text('Please enter a duration'), findsOneWidget);
+    });
+
+    testWidgets('Agenda Item Title Validation', (WidgetTester tester) async {
+      // Title validation rules:
+      // - Must not be empty
+      // - Must contain at least one letter (A-Z or a-z)
+      await tester.pumpWidget(createEditAgendaItemScreen());
+      await tester.pumpAndSettle();
+
+      // Locate the TextFormField using its Key
+      final titleField = find.byKey(const Key('edit_event_agenda_tf1'));
+      expect(titleField, findsOneWidget);
+
+      // Simulate user entering empty text and trigger validation
+      await tester.enterText(titleField, '');
+      await tester.pumpAndSettle();
+      final emptyFieldState = tester.state<FormFieldState<String>>(titleField);
+      emptyFieldState.validate();
+      await tester.pumpAndSettle();
+
+      // Verify the error message for an empty title
+      expect(find.text('Title must not be left blank.'), findsOneWidget);
+
+      // Simulate user entering an invalid title (numbers only) and trigger validation
+      await tester.enterText(titleField, '12345');
+      await tester.pumpAndSettle();
+      final invalidFieldState =
+          tester.state<FormFieldState<String>>(titleField);
+      invalidFieldState.validate();
+      await tester.pumpAndSettle();
+
+      // Verify the error message for an invalid title
+      expect(find.text('Invalid Title'), findsOneWidget);
+
+      // Simulate user entering a valid title and trigger validation
+      await tester.enterText(titleField, 'Team Meeting');
+      await tester.pumpAndSettle();
+      final validFieldState = tester.state<FormFieldState<String>>(titleField);
+      validFieldState.validate();
+      await tester.pumpAndSettle();
+
+      // Verify no error message is shown for valid title
+      expect(find.text('Invalid Title'), findsNothing);
+      expect(find.text('Title must not be left blank.'), findsNothing);
+    });
+
+    testWidgets('Agenda Item Description Validation',
+        (WidgetTester tester) async {
+      // Description validation rules:
+      // - Must not be empty
+      // - Must contain valid characters (add specific rules here)
+      await tester.pumpWidget(createEditAgendaItemScreen());
+      await tester.pumpAndSettle();
+
+      // Locate the TextFormField using its Key
+      final descriptionField = find.byKey(const Key('edit_event_agenda_tf2'));
+      expect(descriptionField, findsOneWidget);
+
+      // Simulate user entering an invalid description and trigger validation
+      await tester.enterText(descriptionField, '');
+      await tester.pumpAndSettle();
+      final emptyFieldState =
+          tester.state<FormFieldState<String>>(descriptionField);
+      emptyFieldState.validate();
+      await tester.pumpAndSettle();
+
+      // Verify the error message for an empty description
+      expect(find.text('Description must not be left blank.'), findsOneWidget);
+
+      // Simulate user entering an invalid title and trigger validation
+      await tester.enterText(descriptionField, '12345');
+      await tester.pumpAndSettle();
+      final invalidFieldState =
+          tester.state<FormFieldState<String>>(descriptionField);
+      invalidFieldState.validate();
+      await tester.pumpAndSettle();
+
+      // Verify the error message for an invalid description
+      expect(find.text('Invalid Description'), findsOneWidget);
+
+      // Test valid description
+      await tester.enterText(descriptionField, 'Valid Description');
+      await tester.pumpAndSettle();
+      final validFieldState =
+          tester.state<FormFieldState<String>>(descriptionField);
+      validFieldState.validate();
+      await tester.pumpAndSettle();
+      expect(find.text('Invalid Description'), findsNothing);
+    });
   });
 }