New at this, so, I create a trigger to send email if certain Contact fields have been updated.  To my surprise, I find I cannot deploy or create the trigger in the production company, I need to create a trigger test.  So I find an example and experiment but I'm not getting it.  Could someone help with how I can create an APEX Class test for this trigger, just enought so I get the idea to finish it?

Thanks if you can.

Kevin

This is the begginging of may last attempt at writing an APEX test.

@isTest
private class ContactChangeCodeCoverageTestTest
 {


    //this section of the test should send no email because the field values 
    //have not changed.    
    static TestMethod void Test0_TestNoFieldChanges()
    {
        string OldEmail = 'OldEmail@test.com';
        sendContactEmailAlertValue(OldEmail);    
        

                 
    }


    //this section of the test should send email because the field values 
    //have changed.    
    static TestMethod void Test1_TestWithFieldChanges()
    {
        string NewEmail = 'NewEmail@test.com';
        sendContactEmailAlertValue(NewEmail);  
    }

    private static void sendContactEmailAlertValue(String EmailValue)
    {
    
        if (EmailValue == 'OldEmail@test.com')
            {
                //don't send email            
            } 
            else 
                {    
                    //send email      
                }             
                
    }
        


}

trigger ContactChangeCodeCoverageTest on Contact (after update) {


try {
// Your code here

    //holds value before change
    date OldBirthdate;
    String OldEmail;
    String OldHomePhone;
    String OldMobilePhone;
    String OldPhone;
    String OldTitle;
    string OldMailingAddress;
    string OldOtherAddress;
    
    date NewBirthdate;
    String NewEmail;
    String NewHomePhone;
    String NewMobilePhone;
    String NewPhone;
    String NewTitle;
    string NewMailingAddress;
    string NewOtherAddress;
    
    String oldAccountName;
    String newAccountName;
    
    string GraduationYear;
    string FieldChanges;
    string ContactName;
    Boolean SendEmail;
    
    //I don't want to send the email unless the fields I'm checking for have changed.    
    //In other words, non-significant Contact fields can change and I won't send Contact Changed spam.    
    SendEmail = False;    
    
    //create a set to hold all of the parent account ids that we need to get names for
    Set<Id> accIds=new Set<id>();
    //create a set for contacts that need checked so we don't have to go through the whole list again
    List<Contact> checkMe = new List<Contact>();
    
    
    //look at the data
    for (Contact con : trigger.new)
    {
    
        NewBirthdate = con.Birthdate;
        NewEmail = con.Email;
        NewHomePhone = con.HomePhone;
        NewMobilePhone = con.MobilePhone;
        NewPhone = con.Phone;
        NewTitle = con.Title;   
        GraduationYear = con.Graduation_Year__c;
        ContactName = con.FirstName;
        ContactName = ContactName + ' ' + con.LastName;
        NewMailingAddress = con.MailingStreet + ', ' + con.MailingCity + ', ' + con.MailingState  + ', ' + con.MailingCountry;
        NewOtherAddress = con.OtherStreet + ', ' + con.OtherCity + ', ' + con.OtherState  + ', ' + con.OtherCountry;        
    
    
        //This looks to see if the current Account ID matches the 
        //previous Account ID    
        if(con.AccountId != trigger.oldMap.get(con.Id).AccountId){
              
            //add the new account to the set
            accIds.add(con.accountId);
                
            //add the old account to the set
            accIds.add(trigger.oldMap.get(con.Id).AccountId);
                
            //add this contact with a changed account to the list to be checked later on
            checkMe.add(con);
            
            //go get the accounts that we need names for and put them in a map that that is keyed by the accountID
            Map<Id, Account> accMap = new Map<Id,Account>([select id, Name from Account where id in :accIds]);    
    
                 for (Contact c : checkMe) {
                    
                    //get the old account id
                    Id oldAcctID = trigger.oldMap.get(con.Id).AccountId;
                    
                    //get the name of the old account
                     oldAccountName = accMap.get(oldAcctID).Name;
                     
                     //get the new account id
                     Id newAcctID = c.AccountId;
                     
                     //get the new Account name
                     newAccountName = accMap.get(newAcctID).Name;
                     
                     //do you comparison from here 
    
                }
        }
    }
    
    for (Contact c : Trigger.old) {
    
            OldBirthdate = c.Birthdate;
            OldEmail = c.Email;
            OldHomePhone = c.HomePhone;
            OldMobilePhone = c.MobilePhone;
            OldPhone = c.Phone;
            OldTitle = c.Title;
            OldMailingAddress = c.MailingStreet + ', ' + c.MailingCity + ', ' + c.MailingState + ', ' + c.MailingCountry;       
            OldOtherAddress = c.OtherStreet + ', ' + c.OtherCity + ', ' + c.OtherState  + ', ' + c.OtherCountry;                
    }
    
    FieldChanges = 'Alumni Contact Information for ' + ContactName + ' has changed:' + '<br>';
    
    FieldChanges = FieldChanges + '<br>';
    
    if (OldMailingAddress != NewMailingAddress) {
    FieldChanges = FieldChanges + 'Mailing Address: ' + OldMailingAddress + ' --> ' + NewMailingAddress + '<br>';
    SendEmail = True;    
    }
    
    if (OldOtherAddress != NewOtherAddress) {
    FieldChanges = FieldChanges + 'Other Address: ' + OldOtherAddress + ' --> ' + NewOtherAddress + '<br>';
    SendEmail = True;    
    }
    
    if (oldAccountName != newAccountName) {
    FieldChanges = FieldChanges + 'Account: ' + oldAccountName + ' --> ' + newAccountName + '<br>';
    SendEmail = True;
    }
    
    if (OldTitle != NewTitle) {
    FieldChanges = FieldChanges + 'Title: ' + OldTitle + ' --> ' + NewTitle + '<br>';
    SendEmail = True;
    }
    
    if (OldEmail != NewEmail) {
    FieldChanges = FieldChanges + 'Email: ' + OldEmail + ' --> ' + NewEmail + '<br>';
    SendEmail = True;
    }
    
    if (OldPhone != NewPhone) {
    FieldChanges = FieldChanges + 'Phone: ' + OldPhone + ' --> ' + NewPhone + '<br>';
    SendEmail = True;
    }
    
    if (OldBirthdate != NewBirthdate) {
    FieldChanges = FieldChanges + 'Birthdate: ' + OldBirthdate + ' --> ' + NewBirthdate + '<br>';
    SendEmail = True;
    }
    
    if (OldHomePhone != NewHomePhone) {
    FieldChanges = FieldChanges + 'Home Phone: ' + OldHomePhone + ' --> ' + NewHomePhone + '<br>';
    SendEmail = True;
    }
    
    if (OldMobilePhone != NewMobilePhone) {
    FieldChanges = FieldChanges + 'Mobile Phone: ' + OldMobilePhone + ' --> ' + NewMobilePhone + '<br>';
    SendEmail = True;
    }
    
    
    if (GraduationYear <> null && SendEmail ) {
      
        // Send Email Notification
            
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[] {'testaddress@testaddress.com'};
        mail.setToAddresses(toAddresses);
        mail.setReplyTo('emailaddress@test.com');
        mail.setSenderDisplayName('My Name');
        mail.setSubject('Alumn: ' + ContactName + ' Contact Information changed.');
        mail.setBccSender(false);
        mail.setUseSignature(false);
        mail.setHtmlBody(FieldChanges);            
        //Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });       
                
        }
    
    } catch (Exception e) {
    // Generic exception handling code here

    }

}