Avalonia/samples/IntegrationTestApp/Pages/AutomationPage.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             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"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="IntegrationTestApp.Pages.AutomationPage">
  <StackPanel>
    <TextBlock Name="TextBlockWithName">TextBlockWithName</TextBlock>
    <TextBlock Name="NotTheAutomationId" AutomationProperties.AutomationId="TextBlockWithNameAndAutomationId">
      TextBlockWithNameAndAutomationId
    </TextBlock>
    <TextBlock Name="TextBlockAsLabel">Label for TextBox</TextBlock>
    <TextBox Name="LabeledByTextBox" AutomationProperties.LabeledBy="{Binding #TextBlockAsLabel}">
      Foo
    </TextBox>
  </StackPanel>
</UserControl>