Can you give an example of conducting unit testing for a graphical user interface?

For unit testing graphical user interfaces (GUI) in C#, frameworks are often used that allow simulating user interaction with interface elements and checking their behavior.

An example using NUnit and the NUnit.Forms library for testing Windows Forms:

using NUnit.Framework;
using NUnit.Extensions.Forms;

public class MyFormTests : NUnitFormTest
{
    private MyForm form;

    [SetUp]
    public void SetUp()
    {
        form = new MyForm();
        form.Show();
    }

    [TearDown]
    public void TearDown()
    {
        form.Close();
    }

    [Test]
    public void ButtonClick_ShouldChangeLabelText()
    {
        // Find button by name
        ButtonTester button = new ButtonTester("myButton", form);
        LabelTester label = new LabelTester("myLabel", form);

        // Check initial text
        Assert.AreEqual("Initial text", label.Text);

        // Click the button
        button.Click();

        // Check that the text has changed
        Assert.AreEqual("Text after click", label.Text);
    }
}

In this example, we create a form, simulate a click on a button, and check the change in label text. This approach allows testing interaction logic in the UI without manual testing.