gistfile1.cs

[TestMethod]
[HostType("Asp.Net")]
[UrlToTest("http://localhost/ourwebapplication")]
public void TestMethod(){
  Page page = TestContext.RequestedPage;
  
  PrivateObject privateObject = new PrivateObject(page);
  
  Button button = (Button)page.FindControl("Button1");
  privateObject.Invoke("Button1_Click", button, EventArgs.Empty);
  
  Label label = (Label)page.FindControl("Label1");
  
  Assert.AreEqual<string>("Hello World !!!!", label.Text);
}