public void Should_ThrowException_WhenCalledGetSenderWithNoEmailAddressInBody()
{
//arrange
var mailMessage = new MailMessage
{
Body = "No email addresses there"
};
var mailMessageParser = new MailMessageParserThunderbird();
//act
Action action = () => mailMessageParser.GetSender(mailMessage);
//assert
action
.ShouldThrow<ApplicationException>()
.WithMessage("Forwarded message has illegal format");
}