public void Should_create_a_filestream()
 {
 	var captureWebPage = new CaptureWebPage(Ie);
 	try
 	{
 		var stream = captureWebPage.CreateFileStream(@"c:\capture_image_test.jpg");
 		Assert.That(stream, Is.Not.Null, "Expected a return value");
 		Assert.That(stream as FileStream, Is.Not.Null, "Expected a FileStream instance");
 		Assert.That(((FileStream)stream).Name, Is.EqualTo(@"c:\capture_image_test.jpg"));
 		
 	}
 	catch(UnauthorizedAccessException ex)
 	{
 		Assert.That(ex.Message, Text.Contains(@"c:\capture_image_test.jpg"));
 	}
 	
 }
        private void CaptureWebPageToFileAndAssert(string imageFileName, CaptureWebPage.ImageCodecs expectedImageType)
        {
            // GIVEN
            var captureWebPage = new CaptureWebPageMock(Ie.DomContainer) { CallBaseCaptureWebPageToFile = false };

            // WHEN
            captureWebPage.CaptureWebPageToFile(imageFileName, true, true, 100, 100);

            // THEN
            Assert.That(captureWebPage.ImageType, Is.EqualTo(expectedImageType), "Unexpected imagetype");
        }