Tree comparison

Compare two visual or logical trees to find differences.

using Avalonia.HeadlessTestingFramework;

// Compare two trees
var result = TreeComparer.CompareVisualTrees(expectedWindow, actualWindow);

if (!result.AreEqual)
{
    Console.WriteLine($"Trees differ: {result.Differences.Count} differences");
    Console.WriteLine($"Match percentage: {result.MatchPercentage:F1}%");

    foreach (var diff in result.Differences)
    {
        Console.WriteLine($"  {diff}");
    }
}

// Compare with options
var options = new TreeComparisonOptions
{
    CompareTypes = true,
    CompareNames = true,
    CompareOrder = true,
    CompareChildCount = true,
    PropertiesToCompare = new() { Button.IsEnabledProperty, Visual.IsVisibleProperty },
    IgnoreTypes = new() { typeof(Border), typeof(ContentPresenter) },
    MaxDepth = 10
};

var result = TreeComparer.CompareVisualTrees(expected, actual, options);

// Compare logical trees
var logicalResult = TreeComparer.CompareLogicalTrees(expectedRoot, actualRoot);

// Summary and detailed differences
Console.WriteLine(result);
foreach (var difference in result.Differences)
    Console.WriteLine(difference);

Difference Types

Type	Description
MissingNode	Node in expected but not actual
ExtraNode	Node in actual but not expected
TypeMismatch	Node types differ
PropertyMismatch	Property values differ
ChildCountMismatch	Number of children differs
OrderMismatch	Child order differs
NameMismatch	Control names differ