public void AddVersionInfo(string productName, string productVersion)
{
var dataSender = new SpanDataSender(new TelemetryConfiguration().WithApiKey("123456"));
var fieldInfo = dataSender.GetType().GetField("_userAgent", BindingFlags.NonPublic | BindingFlags.Instance);
var userAgentValueBefore = fieldInfo.GetValue(dataSender);
var expectedUserAgentValue = userAgentValueBefore?.ToString();
if (!string.IsNullOrEmpty(productName) && !string.IsNullOrEmpty(productVersion))
{
expectedUserAgentValue = userAgentValueBefore + " " + $@"{productName}/{productVersion}";
}
dataSender.AddVersionInfo(productName, productVersion);
var userAgentValueAfter = fieldInfo.GetValue(dataSender);
Assert.AreEqual(expectedUserAgentValue, userAgentValueAfter);
}