public void WhenContextIsNullThenEmptyInstanceOfMailContextIsReturned()
{
MailService mailService = new MailService(Mock.Of <IClient>(), Mock.Of <IMessageBuilderFactory>());
MailContext mailContext = mailService.BuildMessage(null);
mailContext.Should().NotBeNull();
mailContext.EmailContent.Should().NotBeNull();
mailContext.EmailContent.MessageType.Should().Be(MailMessageType.Empty);
}