BinaryStudio.ClientManager.DomainModel.Input.MailMessageParserFactory.GetMailMessageParser C# (CSharp) Method

        public IMailMessageParser GetMailMessageParser(string userAgent)
        {
            if (userAgent.ToLower().Contains("thunderbird"))
                return new MailMessageParserThunderbird();
            //default
            return new MailMessageParserThunderbird();
        }

        public void Should_ReturnMailMessageThunderbirdParser_WhenUserAgentContainsThunderBird()
        {
            //arrange
            var userAgent = "\r\nUser-Agent: Mozilla/5.0 (Windows NT 6.1; rv:14.0) Gecko/20120713 Thunderbird/14.0\r\n";
            var mailMessageParserFactory = new MailMessageParserFactory();

            //act
            var result=mailMessageParserFactory.GetMailMessageParser(userAgent) as MailMessageParserThunderbird;

            //assert
            result.Should().NotBeNull();
        }