[Testing] Feature Matrix UITest Cases for CollectionView Grouping Feature

[NafeelaNazhir]

This PR includes a comprehensive set of UI test cases for the CollectionView control. The tests validate the Grouping feature functionality in CollectionView, including properties such as: IsGrouped, CanMixGroups, CanReorderItems, GroupHeaderTemplate, GroupFooterTemplate,Header, Footer, ItemsLayout, ItemTemplate, ItemsSource.

New Features :

• Added CollectionViewFeaturePage and CollectionViewControlPage to showcase the CollectionView grouping feature. (src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewGrouping/CollectionViewFeaturePage.xaml [1] src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewGrouping/CollectionViewControlPage.xaml [2]
• Implemented the CollectionViewViewModel to manage the data and behavior of the CollectionView, including support for grouped items, reordering, and custom templates. (src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewGrouping/CollectionViewViewModel.cs src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewGrouping/CollectionViewViewModel.csR1-R292)

Code Enhancements:

• Updated CorePageView to include a new GalleryPageFactory for the CollectionView Feature Matrix. (src/Controls/tests/TestCases.HostApp/CoreViews/CorePageView.cs src/Controls/tests/TestCases.HostApp/CoreViews/CorePageView.csR80)

Issues Identified in Grouping Feature

• [Catalyst] CanMixGroups Set to False Still Allows Reordering Between Groups in CollectionView [Catalyst] CanMixGroups Set to False Still Allows Reordering Between Groups in CollectionView #28530
• GroupHeaderTemplate and GroupFooterTemplate Not Displaying in CollectionView(CV2) GroupHeaderTemplate and GroupFooterTemplate Not Displaying in CollectionView(CV2) #28509
• TargetInvocationException Occurs When Selecting Header/Footer After Changing ItemsLayout in CV2 TargetInvocationException Occurs When Selecting Header/Footer After Changing ItemsLayout in CV2 #28678
• [Windows] NullReferenceException thrown When Toggling IsGrouped to True in ObservableCollection Binding [Windows] NullReferenceException thrown When Toggling IsGrouped to True in ObservableCollection Binding #28824
• CollectionView Displays Blank UI When Changing IsGrouped and ItemsSourceType CollectionView Displays Blank UI When Changing IsGrouped and ItemsSourceType #28826
• [Android] Group Header/Footer Repeated for All Items When IsGrouped is True for ObservableCollection [Android] Group Header/Footer Repeated for All Items When IsGrouped is True for ObservableCollection #28827
• ItemsLayout does not change its default value on windows Issue Link: [Windows] CollectionView ItemsLayout does not update while switch from LinearItemsLayout to GridItemsLayout #27946
• .NET MAUI CollectionView does not reorder when grouped on windows Issue Link: .NET MAUI CollectionView does not reorder when grouped #13027

[jsuarezruiz]

/azp run MAUI-UITests-public

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[jsuarezruiz]

/azp run MAUI-UITests-public

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Azure Pipelines successfully started running 1 pipeline(s).

[Copilot]

Pull Request Overview

This PR adds comprehensive UI test cases and feature pages to validate the CollectionView grouping functionality while refactoring some legacy pages.

• Added new pages (CollectionViewFeaturePage, CollectionViewGroupingPage, etc.) and a corresponding view model (CollectionViewViewModel) with additional properties for grouping.
• Updated CorePageView to reference the new CollectionView feature page and removed obsolete pages.

Reviewed Changes

Copilot reviewed 12 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
HeaderFooterMainPage.xaml.cs	Removed outdated header/footer page.
HeaderFooterOptionsPage.xaml.cs	Updated to support dynamic header/footer options for CollectionView grouping.
CollectionViewHeaderPage.xaml.cs	Introduced to showcase header configurations.
CollectionViewViewModel.cs	Extended to support new properties (CanReorderItems, CanMixGroups) and a new ItemsSourceType value.
GroupingOptionsPage.xaml.cs	Added to manage options for grouped CollectionView.
CollectionViewGroupingPage.xaml.cs	Added to test grouping functionality.
CollectionViewFeaturePage.xaml.cs	Added as an entry point for the CollectionView feature matrix.
CollectionViewControlPage.xaml.cs	Removed in favor of the consolidated feature pages.
CorePageView.cs	Updated GalleryPageFactory to reference the new CollectionView feature page.

Files not reviewed (6)

• src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewFeaturePage.xaml: Language not supported
• src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewGrouping/CollectionViewGroupingPage.xaml: Language not supported
• src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewGrouping/GroupingOptionsPage.xaml: Language not supported
• src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/HeaderFooter/CollectionViewHeaderPage.xaml: Language not supported
• src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/HeaderFooter/HeaderFooterOptionsPage.xaml: Language not supported
• src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/HeaderFooterMainPage.xaml: Language not supported

Comments suppressed due to low confidence (2)

src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewViewModel.cs:188

• Ensure that test cases are added for the new properties 'CanReorderItems' and 'CanMixGroups' in both TestCases.HostApp and TestCases.Shared.Tests.

public bool CanReorderItems

src/Controls/tests/TestCases.HostApp/FeatureMatrix/CollectionView/CollectionViewViewModel.cs:218

• [nitpick] Consider clarifying the naming of the enum value 'ObservableCollectionT' so that it clearly differentiates from 'ObservableCollection25T' and 'ObservableCollection5T'.

ItemsSourceType.ObservableCollectionT => _observableCollection,