public void SearchAndReplaceFilename(string text, string expected) { var dataItem = new { Name = "John", SenderAddr = "*****@*****.**", }; using var mmm = new MailMergeMessage(); mmm.Config.SmartFormatterConfig.FormatErrorAction = ErrorAction.ThrowError; mmm.Config.SmartFormatterConfig.ParseErrorAction = ErrorAction.ThrowError; var result = mmm.SearchAndReplaceVarsInFilename(text, dataItem); Assert.AreEqual(expected, result); }