How to wait for SHDocVw InternetExplorerClass.DocumentComplete event in a C# unit test?

In order to wait for the DocumentComplete event of the SHDocVw.InternetExplorerClass in a C# unit test, you can use a ManualResetEvent to block the test execution until the event is raised. Here's a step-by-step guide:

1. First, make sure you have added a reference to the Microsoft Internet Controls COM component, which includes the SHDocVw namespace.

2. Create a ManualResetEvent in your test class to signal when the DocumentComplete event is raised:

csharpCopy code
using System.Threading;



public class WebBrowserTest

{

    private readonly ManualResetEvent documentCompleteEvent = new ManualResetEvent(false);



    // Your test method here

    // ...

}

1. In your test method, create an instance of SHDocVw.InternetExplorerClass and subscribe to the DocumentComplete event:

csharpCopy code
using SHDocVw;



public void YourTestMethod()

{

    // Create an instance of InternetExplorerClass

    var internetExplorer = new InternetExplorerClass();



    // Subscribe to the DocumentComplete event

    internetExplorer.DocumentComplete += InternetExplorer_DocumentComplete;



    // Navigate to your URL

    internetExplorer.Navigate("https://www.example.com");



    // Wait for the DocumentComplete event to be raised

    documentCompleteEvent.WaitOne();



    // Test assertions or other logic after the document is fully loaded

    // ...



    // Close the InternetExplorer instance (optional)

    internetExplorer.Quit();

}

1. Define the event handler for the DocumentComplete event. In this handler, you can set the documentCompleteEvent to signaled, indicating that the document has finished loading:

csharpCopy code
private void InternetExplorer_DocumentComplete(object pDisp, ref object URL)

{

    // Check if the event was triggered by the main frame (not an iframe)

    if (pDisp == internetExplorer)

    {

        // Set the event to signaled

        documentCompleteEvent.Set();

    }

}

With this setup, your test method will block at documentCompleteEvent.WaitOne() until the DocumentComplete event is raised and the event handler sets the documentCompleteEvent to signaled. This ensures that your test method waits for the document to be fully loaded before proceeding with any further test logic or assertions.