<Window x:Class="WpfAppAnimal.MainWindow"
          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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          xmlns:local="clr-namespace:WpfAppAnimal"
          mc:Ignorable="d"
          Title="MainWindow" Height="450" Width="800">
     <Grid>
          <TextBlock
               HorizontalAlignment="Left"
               Margin="147,78,0,0"
               TextWrapping="Wrap"
               Text="Enter animal name:"
               VerticalAlignment="Top"/>
         
          <TextBox
               HorizontalAlignment="Left"
               Height="23"
               Margin="256,77,0,0"
               TextWrapping="Wrap"
               AutomationProperties.AutomationId="AnimalNameTextId"
               Text="{Binding MyModel.AnimalName}"
               VerticalAlignment="Top"
               Width="120"/>
         
          <Button
               Content="Calculate lifetime"
               HorizontalAlignment="Left"
               Margin="147,129,0,0"
               AutomationProperties.AutomationId="CalculateButtonId"
               Command="{Binding MyModel.ClickMyButton1, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"
               VerticalAlignment="Top" Width="142"/>
         
          <TextBlock
               HorizontalAlignment="Left"
               Margin="147,185,0,0"
               TextWrapping="Wrap"
               AutomationProperties.AutomationId="LifeTimeTextId"
               Text="{Binding MyModel.LifeTime, UpdateSourceTrigger=PropertyChanged}"
               VerticalAlignment="Top"
               Height="21"
               Width="109"/>

     </Grid>
</Window>

using OpenQA.Selenium.Appium;
using OpenQA.Selenium.Appium.Windows;

namespace AutoTestForWpfApp
{
     public class Tests
     {
          public const string DriverUrl = "http://127.0.0.1:4723/";

          [SetUp]
          public void Setup()
          {
          }

          [Test]
          public void Test_CheckDog_LifeTime()
          {
               // run WPF exe
               string appWPF = @"D:\WpfAppAnimal\bin\Debug\WpfAppAnimal.exe";
               var options = new AppiumOptions();
               options.AddAdditionalCapability("app", appWPF);
               var session = new WindowsDriver<WindowsElement>(new Uri(DriverUrl), options);

               // wait running WPF (3 seconds)
               Thread.Sleep(3000);

               WindowsElement element = null;

               // autotest write in wpf application text "dog"
               element = session.FindElementByAccessibilityId("AnimalNameTextId");
               element.SendKeys("dog");

               // autotest click button in wpf application
               element = session.FindElementByAccessibilityId("CalculateButtonId");
               element.Click();

               // autotest get text from wpf application
               element = session.FindElementByAccessibilityId("LifeTimeTextId");

               // result
               Assert.AreEqual("16 years", element.Text);

               // close wpf application
               session.Quit();
          }
     }
}