/// <summary>
/// Get value for "appSettings" key.
/// </summary>
/// <param name="xmlTester"><see cref="XmlTester"/>.</param>
/// <param name="key">The key.</param>
/// <returns>The value.</returns>
public static string GetAppSettingsValue(this XmlTester xmlTester, string key)
{
return(xmlTester.GetAttributeValue(xmlTester.GetAppSettingsElement(key), "value"));
}