Test Class Example For Messaging.IndboundEmail Class

Apex Class:

 global class inBoundEmail implements Messaging.InboundEmailHandler
{
   global Messaging.InboundEmailResult handleInboundEmail(Messaging.InboundEmail email,                 Messaging.InboundEnvelope envelope)
   {
        Messaging.InboundEmailResult result = new Messaging.InboundEmailresult();
        String subToCompare = 'Create Contact';

       if(email.subject.equalsIgnoreCase(subToCompare))
        {
            Contact c = new Contact();
            c.Email=email.fromAddress;
           
            // capture phone number and city also from incoming email.
            // Splits each line by the terminating newline character
            // and looks for the position of the phone number and city
            String[] emailBody = email.plainTextBody.split('\n', 0);
            c.LastName=emailBody[0].substring(0);
            c.Phone = emailBody[1].substring(0);
            c.Title = emailBody[2].substring(0);
                     
            insert c;
           
            // Save attachments, if any
            if (email.textAttachments != null)
            {
            for(Messaging.Inboundemail.TextAttachment tAttachment : email.textAttachments)
            {
            Attachment attachment = new Attachment();

            attachment.Name = tAttachment.fileName;
            attachment.Body = Blob.valueOf(tAttachment.body);
            attachment.ParentId = c.Id;
            insert attachment;
            }
           
            }

            //Save any Binary Attachment
           
            if (email.binaryAttachments != null)
            {
            for(Messaging.Inboundemail.BinaryAttachment bAttachment : email.binaryAttachments) {
            Attachment attachment = new Attachment();

            attachment.Name = bAttachment.fileName;
            attachment.Body = bAttachment.body;
            attachment.ParentId = c.Id;
            insert attachment;
            }
           }
        }

        result.success = true;
        return result;
           
   }
}

Test Class For Above Class:

   @isTest(seeAllData=true);
Private Class InBoundEmailTest()
{
//Test Method for main class
     static testMethod void TestinBoundEmail()
    {
       Test.startTest();
      // create a new email and envelope object
       Messaging.InboundEmail email = new Messaging.InboundEmail() ;
       Messaging.InboundEnvelope env = new Messaging.InboundEnvelope();
     
       // setup the data for the email
      email.subject = 'Create Contact';
      email.fromAddress = 'someaddress@email.com';
      email.plainTextBody = 'email body\n2225256325\nTitle';
     
      // add an Binary attachment

      Messaging.InboundEmail.BinaryAttachment attachment = new Messaging.InboundEmail.BinaryAttachment();
      attachment.body = blob.valueOf('my attachment text');
      attachment.fileName = 'textfileone.txt';
      attachment.mimeTypeSubType = 'text/plain';
      email.binaryAttachments = new Messaging.inboundEmail.BinaryAttachment[] { attachment };

 
      // add an Text atatchment
 
      Messaging.InboundEmail.TextAttachment attachmenttext = new Messaging.InboundEmail.TextAttachment();
      attachmenttext.body = 'my attachment text';
      attachmenttext.fileName = 'textfiletwo3.txt';
      attachmenttext.mimeTypeSubType = 'texttwo/plain';
      email.textAttachments =   new Messaging.inboundEmail.TextAttachment[] { attachmenttext };
     
     
      // call the email service class and test it with the data in the testMethod
      inBoundEmail  testInbound=new inBoundEmail ();
      testInbound.handleInboundEmail(email, env);
       

   }
}