added samples for the NumericUpDown control and tried to set up a first test (WIP)

Author: corvinsz

tests/MaterialDesignThemes.UITests/Samples/UpDownControls/BoundNumericUpDown.xaml

@@ -0,0 +1,17 @@
+<UserControl x:Class="MaterialDesignThemes.UITests.Samples.UpDownControls.BoundNumericUpDown"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:local="clr-namespace:MaterialDesignThemes.UITests.Samples.UpDownControls"
+             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             d:DataContext="{d:DesignInstance local:BoundNumericUpDownViewModel,
+                                              IsDesignTimeCreatable=False}"
+             d:DesignHeight="450"
+             d:DesignWidth="800"
+             mc:Ignorable="d">
+  <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
+    <materialDesign:NumericUpDown Value="{Binding Value}" />
+    <Button x:Name="btnToFocus" Content="Button to focus" />
+  </StackPanel>
+</UserControl>

tests/MaterialDesignThemes.UITests/Samples/UpDownControls/BoundNumericUpDown.xaml.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using Xunit.Sdk;
+
+namespace MaterialDesignThemes.UITests.Samples.UpDownControls;
+
+/// <summary>
+/// Interaction logic for BoundNumericUpDown.xaml
+/// </summary>
+public partial class BoundNumericUpDown : UserControl
+{
+    public BoundNumericUpDown()
+    {
+        this.ViewModel = new BoundNumericUpDownViewModel();
+        this.DataContext = this.ViewModel;
+        InitializeComponent();
+    }
+
+    //I expose the ViewModel here so I can access it in the tests
+    public BoundNumericUpDownViewModel ViewModel { get; }
+}

tests/MaterialDesignThemes.UITests/Samples/UpDownControls/BoundNumericUpDownViewModel.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace MaterialDesignThemes.UITests.Samples.UpDownControls;
+
+//If needed this can be refactored to be generic so all variations of the UpDownControl can use this as a VM
+public partial class BoundNumericUpDownViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private int _value;
+}

tests/MaterialDesignThemes.UITests/Samples/UpDownControls/BoundNumericUpDownWindow.xaml

@@ -0,0 +1,22 @@
+<Window x:Class="MaterialDesignThemes.UITests.Samples.UpDownControls.BoundNumericUpDownWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:local="clr-namespace:MaterialDesignThemes.UITests.Samples.UpDownControls"
+        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        Title="BoundNumericUpDownWindow"
+        Width="800"
+        Height="450"
+        Background="{DynamicResource MaterialDesign.Brush.Background}"
+        FontFamily="{materialDesign:MaterialDesignFont}"
+        Loaded="BoundNumericUpDownWindow_OnLoaded"
+        TextElement.FontSize="13"
+        TextElement.FontWeight="Regular"
+        TextElement.Foreground="{DynamicResource MaterialDesign.Brush.Foreground}"
+        TextOptions.TextFormattingMode="Ideal"
+        TextOptions.TextRenderingMode="Auto"
+        WindowStartupLocation="CenterScreen"
+        mc:Ignorable="d">
+  <local:BoundNumericUpDown />
+</Window>

tests/MaterialDesignThemes.UITests/Samples/UpDownControls/BoundNumericUpDownWindow.xaml.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace MaterialDesignThemes.UITests.Samples.UpDownControls;
+
+/// <summary>
+/// Interaction logic for BoundNumericUpDownWindow.xaml
+/// </summary>
+public partial class BoundNumericUpDownWindow : Window
+{
+    public BoundNumericUpDownWindow()
+    {
+        InitializeComponent();
+    }
+
+    private void BoundNumericUpDownWindow_OnLoaded(object sender, RoutedEventArgs e)
+    {
+        Activate();
+        Topmost = true;
+        Topmost = false;
+        Focus();
+    }
+}

tests/MaterialDesignThemes.UITests/WPF/UpDownControls/NumericUpDownTests.cs

@@ -1,4 +1,5 @@
 using System.ComponentModel;
+using MaterialDesignThemes.UITests.Samples.UpDownControls;
 
 namespace MaterialDesignThemes.UITests.WPF.UpDownControls;
 
@@ -156,4 +157,36 @@ public async Task InternalTextBoxIsFocused_WhenGettingKeyboardFocus()
 
         recorder.Success();
     }
+
+    [Fact]
+    public async Task NumericUpDown_ValueSetGreaterThanMaximum_CoercesToMaximum()
+    {
+        await using var recorder = new TestRecorder(App);
+
+        //Arrange
+        await App.InitializeWithMaterialDesign();
+        IWindow window = await App.CreateWindow<BoundNumericUpDownWindow>();
+        var userControl = await window.GetElement<BoundNumericUpDown>();
+        var numericUpDown = await userControl.GetElement<NumericUpDown>();
+        var buttonToFocus = await userControl.GetElement<Button>("btnToFocus");
+
+        //Set the current value to the maximum
+        await numericUpDown.SetMaximum(10);
+        await numericUpDown.SetValue(10);
+
+        //Act
+        //Input a number greater than the maximum
+        await numericUpDown.MoveKeyboardFocus();
+        //await numericUpDown.SendInput(new KeyboardInput("99"));
+        await numericUpDown.SendKeyboardInput($"99");
+        await buttonToFocus.MoveKeyboardFocus();
+
+        //Assert
+        //The value and bound property in the VM should be set to the maximum
+        Assert.Equal(10, await numericUpDown.GetValue());
+        var viewModel = await userControl.GetProperty<BoundNumericUpDownViewModel>(nameof(BoundNumericUpDown.ViewModel));
+        Assert.Equal(10, viewModel.Value);
+
+        recorder.Success();
+    }
 }