Hi,

how to write a test class single email message

public class emailclass1
{
public String error{get;set;}
public String successMsg{get;set;}
public List<String> addresses {get;set;}
public boolean flagToSendMail;
public string plainbody{get;set;}
public string Email{get;set;}
public string Cc{get;set;}
public string BCc{get;set;}
public string subject{get;set;}
public attachment attach{get;set;}
public string Richtext{get;set;}
public emailclass1()
{
system.debug('^^^^^^'+attach);
attach=new attachment();
}
public String message {get;set;}

public pagereference send()
{
if(Email==null|| Email=='' || attach==null)
{
ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.FATAL, 'Please check your uasername and email id');
ApexPages.addMessage(myMsg);
return null;
}
else
{

if(Email != '' || cc != '' || bcc != '' || attach!=null)
{
List<String> toAddresses = new List<String>();
List<String> ccAddresses = new List<String>();
List<String> bccAddresses = new List<String>();

List<String> tmpAddr = new List<String>();
if(Email.contains(','))
{
toAddresses = Email.split(',');
for(String tmp:toAddresses)
{
tmpAddr.add(tmp);
}
}
else if(Email != '')
{
toAddresses.add(Email );
tmpAddr.add(Email);
}
if(cc.contains(','))
{
ccAddresses = cc.split(',');
for(String tmp:ccAddresses)
{
tmpAddr.add(tmp);
}
}
else if(cc != '')
{
ccAddresses.add(cc);
tmpAddr.add(cc);
}
if(bcc.contains(','))
{
bccAddresses = bcc.split(',');
for(String tmp:bccAddresses)
{
tmpAddr.add(tmp);
}
}
else if(bcc != '')
{
bccAddresses.add(bcc);
tmpAddr.add(bcc);
}

addresses = tmpAddr;
for(String tempStr:addresses)
{
if(!Pattern.matches('[a-zA-Z0-9._-]+@[a-zA-Z]+.[a-zA-Z]{2,4}', tempStr))
{
error = 'Check To, CC and BCC addresses';
successMsg = '';
flagToSendMail = false;
break;
}
else
{
flagToSendMail = true;
}
}


if(flagToSendMail == true)
{
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
if(toAddresses != null)
{
mail.setToAddresses(toAddresses);
}
if(toAddresses != null)
{
mail.setccAddresses(ccAddresses);
}
if(toAddresses != null)
{
mail.setbccAddresses(bccAddresses);
}
Messaging.EmailFileAttachment[] fileAttachments = new Messaging.EmailFileAttachment[]{};
Messaging.EmailFileAttachment pdfFileAttachment = new Messaging.EmailFileAttachment();
pdfFileAttachment.setBody(attach.body);
pdfFileAttachment.setFileName('file xlsx');
fileAttachments.add(pdfFileAttachment);


mail.setToAddresses(toAddresses);
mail.setCcAddresses(CcAddresses );
mail.setBCcAddresses(BCcAddresses );
mail.setSubject(subject);
mail.setPlainTextBody(plainbody);
//mail.setFileAttachments(new Messaging.EmailFileAttachment{attach});
mail.setFileAttachments(fileAttachments );

Messaging.SendEmailResult[] sendResult = Messaging.sendEmail(new Messaging.SingleEmailMessage[]{mail});


}
}

//ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.FATAL, 'Email sent successfully');
//ApexPages.addMessage(myMsg);
Email='';
subject='';
plainbody='';
cc='';
bcc='';

}
return null;
}

}

My test class

@istest
private class emailtestclass
{
static testmethod void test()
{


Attachment attach=new Attachment();



Messaging.EmailFileAttachment pdfFileAttachment = new Messaging.EmailFileAttachment();
Messaging.SingleEmailMessage mail1 = new Messaging.SingleEmailMessage();
mail1.setPlainTextBody('plainbody');
emailclass1 mail=new emailclass1();

pdfFileAttachment.setBody(attach.body);
pdfFileAttachment.setFileName('file xlsx');

mail.Email='suresh@gmail.com,suresh.a@gmail.com';
mail.cc='suresh.p@gmail.com,suresh.ar@gmail.com';
mail.bcc='suresh@gmail.com,suresh.ad@gmail.com';
mail.send();

mail.Email='suresh.a@gmail.com';
mail.cc='';
mail.bcc='';
mail.send();

}
static testmethod void test1()
{

}
}

i got an error like

Please help me