How to write Unit Tests for Web Applications and Controls

[Test]
public void TestExample()
{
   // First, instantiate "Tester" objects:
   LabelTester label = new LabelTester("textLabel");
   LinkButtonTester link = new LinkButtonTester("linkButton");

   // Second, visit the page being tested:
   Browser.GetPage("http://localhost/example/example.aspx");

   // Third, use tester objects to test the page:
   Assert.AreEqual("Not clicked.", label.Text);
   link.Click();
   Assert.AreEqual("Clicked once.", label.Text);
   link.Click();
   Assert.AreEqual("Clicked twice.", label.Text);
}