xamltest-ui-tests

Testing & Quality

Write and update WPF UI tests in MaterialDesignThemes.UITests using XAMLTest. Use when template, layout, focus, interaction, or visual behavior needs coverage, or when a reviewer asks to move runtime UI checks out of MaterialDesignThemes.Wpf.Tests.

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How to use this skill

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Source SKILL.md: https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/blob/HEAD/.github/skills/xamltest-ui-tests/SKILL.md

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XAMLTest UI tests

Use this skill when working on runtime WPF behavior in this repository.

When to use it

A change touches templates, visual states, focus behavior, layout, coordinates, or input handling.
You need to inspect named template parts such as PART_TextBox or PART_IncreaseButton.
A reviewer asks to use XAMLTest instead of regular unit tests.
You need to assert WPF-only properties like Padding, Visibility, ActualWidth, or DataContext state after layout.

Repository-specific rules

Put runtime UI behavior tests in tests/MaterialDesignThemes.UITests.
Do not add visual-tree or layout interaction tests to tests/MaterialDesignThemes.Wpf.Tests.
Prefer extending the existing feature file under tests/MaterialDesignThemes.UITests/WPF/<feature>/ instead of creating a generic catch-all test file.
Match the existing file's result-recording pattern; many current UI tests use TestRecorder, but it should not be treated as a blanket requirement.
Ask permission before running UI tests, and only run the affected ones.

Standard pattern

Inherit from TestBase.
Use LoadXaml<T>() for focused control scenarios.
Use LoadUserControl<T>() when you need a sample view model, bindings, or additional focus targets.
Get named parts with GetElement<T>("PART_Name").
Use RemoteExecute with static methods for properties that helpers do not expose directly.
Use Wait.For(...) for layout-sensitive assertions.

What to prefer

GetCoordinates() for alignment and spacing assertions.
RemoteExecute for Padding, Visibility, ActualWidth, Margin, or DataContext inspection.
Keyboard and mouse helpers such as MoveKeyboardFocus, SendKeyboardInput, and LeftClick for interaction.

What to avoid

Inspecting the visual tree from MaterialDesignThemes.Wpf.Tests for runtime template behavior.
Overly broad UI suites when a single targeted XAMLTest scenario will do.
Repeating helper code inline when a small static local or private helper method is enough.

Example

[Test]
public async Task DecimalUpDown_WithMaximum_DisablesPlusButton()
{
    await using var recorder = new TestRecorder(App);

    var decimalUpDown = await LoadXaml<DecimalUpDown>("""
    <materialDesign:DecimalUpDown Value="1" Maximum="2" />
    """);
    var plusButton = await decimalUpDown.GetElement<RepeatButton>("PART_IncreaseButton");
    var textBox = await decimalUpDown.GetElement<TextBox>("PART_TextBox");

    await plusButton.LeftClick();
    await Wait.For(async () =>
    {
        await Assert.That(await textBox.GetText()).IsEqualTo("2");
        await Assert.That(await decimalUpDown.GetValue()).IsEqualTo(2);
    });

    await Assert.That(await plusButton.GetIsEnabled()).IsFalse();

    recorder.Success();
}

Useful local references

tests/MaterialDesignThemes.UITests/TestBase.cs
tests/MaterialDesignThemes.UITests/XamlTestExtensions.cs
Existing feature tests under tests/MaterialDesignThemes.UITests/WPF/