Nonprofit Year End Donation Receipt

COMPARISON V 1

public class yearEndCampaignTable implements
Database.Batchable<sObject>,Database.Stateful {
    //instance member to retain state across transactions
    public static Integer emailLimits;
    public Integer recordsProcessed =0;
    
  public Database.QueryLocator start(Database.BatchableContext bc) {
        Integer year = Date.Today().year()-1; 
        return Database.getQueryLocator([SELECT LastName, id,Gifts_Last_Year__c, (SELECT Id, CloseDate, Amount, Campaign.Name FROM Opportunities 
                                                                                  WHERE CALENDAR_YEAR(CloseDate) =:year AND IsWon = True ORDER 
                                                                                  BY CloseDate) FROM Contact WHERE npo02__OppAmountLastYear__c > 0 WITH SECURITY_ENFORCED]);          
    }
    
    public void execute(Database.BatchableContext bc, List<Contact> scope) {
        //process each batch of records
        List<Contact> contactsForUpdate = new List<Contact>();
        String loopString;
        String longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;">Date</th>   <th style="border: 1px solid black;">Amount</th><th style="border: 1px solid black;">Campaign Name</th> </tr>';
        String dateFormatString = 'MMMM d, yyyy';
        String finalString;
        for (Contact con : scope) {
            for (Opportunity opp : con.opportunities) {
                Date d = opp.CloseDate;
                Datetime dt = Datetime.newInstance(d.year(), d.month(),d.day());
                String dateString = dt.format(dateFormatString);
                String cleanAmt = String.valueOf(opp.Amount);
                
                loopString =
                    '<tr> <td style="border: 1px solid black; padding: 15px;">' + dateString +
                    '</th> <td style="border: 1px solid black; padding: 15px;"> $' + cleanAmt + 
                   '</th> <td style="border: 1px solid black; padding: 15px;">' + opp.Campaign.Name + 
                    '</th> </tr>';
                longestString = longestString + loopString;
            }
            finalstring = longestString + '</table>';
            con.Gifts_Last_Year__c = String.escapeSingleQuotes(finalstring);
            contactsForUpdate.add(con);
            longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th> <th style="border: 1px solid black;">Campaign</th></tr>';
            recordsProcessed = recordsProcessed + 1;
            system.debug('Final String' + finalstring);
        }
        update contactsForUpdate;
    }
    public void finish(Database.BatchableContext bc){
        AsyncApexJob job = [SELECT Id, Status, NumberOfErrors,
                            JobItemsProcessed,
                            TotalJobItems, CreatedBy.Email
                            FROM AsyncApexJob
                            WHERE Id = :bc.getJobId()];
        
        String subject = 'Year End Gift Batches complete';
        String body = 'records processed ' + recordsProcessed.format() + '. The batch apex processed '+ job.TotalJobItems;
        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        // Now sets the below paramaters of the email object
        email.setSubject( subject );
        // Here I am accessing current user email id to whom we are sending email
        email.setToAddresses( new String[] {UserInfo.getUserEmail()} );
        email.setPlainTextBody( body );
        // Sends the email
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});  
        system.debug('records processed: ' + recordsProcessed);
        emailLimits = Limits.getEmailInvocations();
        system.debug ('emaillimits:' + emailLimits);
        if (r[0].success) {
            System.debug('The email was sent successfully to ' + UserInfo.getUserEmail());
        } else {
            System.debug('The email failed to send: '+ r[0].errors[0].message);
            FeedItem post = new FeedItem();
            post.ParentId = UserInfo.getUserId(); 
            post.Body = body;
            List<FeedItem> postList= new List<FeedItem>();
            postList.add(post);
            Insert postList;
        }  
    }
    
    
}

COMPARISON V2

public class yearEndGiftBatch implements 
Database.Batchable<sObject>,Database.Stateful {
    //instance member to retain state across transactions
    public static Integer emailLimits;
    public Integer recordsProcessed =0;
    
  public Database.QueryLocator start(Database.BatchableContext bc) {
        Integer year = Date.Today().year()-1; 
        return Database.getQueryLocator([SELECT LastName, id,Gifts_Last_Year__c, (SELECT Id, CloseDate, Amount FROM Opportunities 
                                                                                  WHERE CALENDAR_YEAR(CloseDate) =:year AND IsWon = True ORDER 
                                                                                  BY CloseDate) FROM Contact WHERE npo02__OppAmountLastYear__c > 0 WITH SECURITY_ENFORCED]);          
    }
    
    public void execute(Database.BatchableContext bc, List<Contact> scope) {
        //process each batch of records
        List<Contact> contactsForUpdate = new List<Contact>();
        String loopString;
        String longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th></tr>';
        String dateFormatString = 'MMMM d, yyyy';
        String finalString;
        for (Contact con : scope) {
            for (Opportunity opp : con.opportunities) {
                Date d = opp.CloseDate;
                Datetime dt = Datetime.newInstance(d.year(), d.month(),d.day());
                String dateString = dt.format(dateFormatString);
                String cleanAmt = String.valueOf(opp.Amount);
                
                loopString =
                    '<tr> <td style="border: 1px solid black; padding: 15px;">' + dateString +
                    '</th> <td style="border: 1px solid black; padding: 15px;"> $' + cleanAmt + '</th> </tr>'; 
                longestString = longestString + loopString;
            }
            finalstring = longestString + '</table>';
            con.Gifts_Last_Year__c = String.escapeSingleQuotes(finalstring);
            contactsForUpdate.add(con);
			longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th></tr>';
            recordsProcessed = recordsProcessed + 1;
            system.debug('Final String' + finalstring);
        }
        update contactsForUpdate;
    }
    public void finish(Database.BatchableContext bc){
        AsyncApexJob job = [SELECT Id, Status, NumberOfErrors,
                            JobItemsProcessed,
                            TotalJobItems, CreatedBy.Email
                            FROM AsyncApexJob
                            WHERE Id = :bc.getJobId()];
        
        String subject = 'Year End Gift Batches complete';
        String body = 'records processed ' + recordsProcessed.format() + '. The batch apex processed '+ job.TotalJobItems;
        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        // Now sets the below paramaters of the email object
        email.setSubject( subject );
        // Here I am accessing current user email id to whom we are sending email
        email.setToAddresses( new String[] {UserInfo.getUserEmail()} );
        email.setPlainTextBody( body );
        // Sends the email
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});  
        system.debug('records processed: ' + recordsProcessed);
        emailLimits = Limits.getEmailInvocations();
        system.debug ('emaillimits:' + emailLimits);
        if (r[0].success) {
            System.debug('The email was sent successfully to ' + UserInfo.getUserEmail());
        } else {
            System.debug('The email failed to send: '+ r[0].errors[0].message);
            FeedItem post = new FeedItem();
            post.ParentId = UserInfo.getUserId(); 
            post.Body = body;
            List<FeedItem> postList= new List<FeedItem>();
            postList.add(post);
            Insert postList;
        }  
    }
    
    
}

Fiscal Year Tax Receipt

//run this class to implement for Fiscal Years instead of calendar year
//Change your NPSP roll-up for Total Gifts Last Year to use Fiscal Year instead of calendar
//launch in execute anonymous by pasting in the next line without the two //
//Id batchJobId = Database.executeBatch(new fiscalYearEndGiftBatch());

public class fiscalYearEndGiftBatch implements 
Database.Batchable<sObject>,Database.Stateful {
    //instance member to retain state across transactions
    public static Integer emailLimits;
    public Integer recordsProcessed =0;
    
    public Database.QueryLocator start(Database.BatchableContext bc) {
        String currentFiscalYear = [SELECT FiscalYearSettings.Name FROM Period WHERE Type = 'Year' AND StartDate <= TODAY AND EndDate >= TODAY].FiscalYearSettings.Name;  
        Integer i = Integer.valueOf(currentFiscalYear);
        Integer year = i - 1; 
        return Database.getQueryLocator([SELECT LastName, id,Gifts_Last_Year__c, (SELECT Id, CloseDate, Amount FROM Opportunities 
                                                                                  WHERE FISCAL_YEAR(CloseDate) =:year AND IsWon = True ORDER 
                                                                                  BY CloseDate) FROM Contact WHERE npo02__OppAmountLastYear__c > 0 WITH SECURITY_ENFORCED]);          
    }
    
    public void execute(Database.BatchableContext bc, List<Contact> scope) {
        //process each batch of records
        List<Contact> contactsForUpdate = new List<Contact>();
        String loopString;
        String longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th></tr>';
        String dateFormatString = 'MMMM d, yyyy';
        String finalString;
        for (Contact con : scope) {
            for (Opportunity opp : con.opportunities) {
                Date d = opp.CloseDate;
                Datetime dt = Datetime.newInstance(d.year(), d.month(),d.day());
                String dateString = dt.format(dateFormatString);
                String cleanAmt = String.valueOf(opp.Amount);
                
                loopString =
                    '<tr> <td style="border: 1px solid black; padding: 15px;">' + dateString +
                    '</th> <td style="border: 1px solid black; padding: 15px;"> $' + cleanAmt + '</th> </tr>'; 
                longestString = longestString + loopString;
            }
            finalstring = longestString + '</table>';
            con.Gifts_Last_Year__c = String.escapeSingleQuotes(finalstring);
            contactsForUpdate.add(con);
			longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th></tr>';
            recordsProcessed = recordsProcessed + 1;
            system.debug('Final String' + finalstring);
        }
        update contactsForUpdate;
 }
    public void finish(Database.BatchableContext bc){
        AsyncApexJob job = [SELECT Id, Status, NumberOfErrors,
                            JobItemsProcessed,
                            TotalJobItems, CreatedBy.Email
                            FROM AsyncApexJob
                            WHERE Id = :bc.getJobId()];
        
        String subject = 'Year End Gift Batches complete';
        String body = 'records processed ' + recordsProcessed.format() + '. The batch apex processed '+ job.TotalJobItems;
        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        // Now sets the below paramaters of the email object
        email.setSubject( subject );
        // Here I am accessing current user email id to whom we are sending email
        email.setToAddresses( new String[] {UserInfo.getUserEmail()} );
        email.setPlainTextBody( body );
        // Sends the email
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});  
        system.debug('records processed: ' + recordsProcessed);
        emailLimits = Limits.getEmailInvocations();
        system.debug ('emaillimits:' + emailLimits);
        if (r[0].success) {
            System.debug('The email was sent successfully to ' + UserInfo.getUserEmail());
        } else {
            System.debug('The email failed to send: '+ r[0].errors[0].message);
            FeedItem post = new FeedItem();
            post.ParentId = UserInfo.getUserId(); 
            post.Body = body;
            List<FeedItem> postList= new List<FeedItem>();
            postList.add(post);
            Insert postList;
        }  
    }
    
    
}

yearEndCampaignTable.apxc

//Code by Jessie Rymph
//December 30, 2021
//launch in execute anonymous by pasting in the next line without the two //
//Id batchJobId = Database.executeBatch(new yearEndCampaignTable());
//https://wp.me/p9qPLI-1q8
//Instructions on how to add additional fields are found in rows 15, 16, 26, 41, 42.
//Compare this class with YearEndGiftBatch to see how I added the Campaign Name field to this version. 

public class yearEndCampaignTable implements
Database.Batchable<sObject>,Database.Stateful {
    //instance member to retain state across transactions
    public static Integer emailLimits;
    public Integer recordsProcessed =0;
    public Database.QueryLocator start(Database.BatchableContext bc) {
        Integer year = Date.Today().year()-1; 
        //******To add in additional fields from the Contact add them in the list with LastName, id, Gifts_Last_Year__c
        //******To add in additional fields from the Opportunity add them in the list with id, CloseDate, Amount, Campaign.Name
        return Database.getQueryLocator([SELECT LastName, id,Gifts_Last_Year__c, (SELECT Id, CloseDate, Amount, Campaign.Name FROM Opportunities 
                                                                                  WHERE CALENDAR_YEAR(CloseDate) =:year AND IsWon = True ORDER 
                                                                                  BY CloseDate) FROM Contact WHERE npo02__OppAmountLastYear__c > 0 WITH SECURITY_ENFORCED]);          
    }
    
    public void execute(Database.BatchableContext bc, List<Contact> scope) {
        //process each batch of records
        List<Contact> contactsForUpdate = new List<Contact>();
        String loopString;
        //******To add another column to the table, add another section to longestString. <th style="border: 1px solid black;">Name of Column </th>
        String longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;">Date</th>   <th style="border: 1px solid black;">Amount</th><th style="border: 1px solid black;">Campaign Name</th> </tr>';
        String dateFormatString = 'MMMM d, yyyy';
        String finalString;
        for (Contact con : scope) {
            for (Opportunity opp : con.opportunities) {
                //system.debug(con.LastName);
                Date d = opp.CloseDate;
                Datetime dt = Datetime.newInstance(d.year(), d.month(),d.day());
                String dateString = dt.format(dateFormatString);
                String cleanAmt = String.valueOf(opp.Amount);
                
                loopString =
                    '<tr> <td style="border: 1px solid black; padding: 15px;">' + dateString +
                    '</th> <td style="border: 1px solid black; padding: 15px;"> $' + cleanAmt + 
                    //******To add another field to the table, from the opportunity, follow the pattern of row 41, and replace "Campaign.Name" with the field name.   
                    //******To add the ID for example, '</th> <td style="border: 1px solid black; padding: 15px;">' + opp.Id + 
                    '</th> <td style="border: 1px solid black; padding: 15px;">' + opp.Campaign.Name + 
                    '</th> </tr>';
                longestString = longestString + loopString;
            }
            finalstring = longestString + '</table>';
            con.Gifts_Last_Year__c = String.escapeSingleQuotes(finalstring);
            contactsForUpdate.add(con);
            longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th> <th style="border: 1px solid black;">Campaign</th></tr>';
            recordsProcessed = recordsProcessed + 1;
            system.debug('Final String' + finalstring);
            
        }
        update contactsForUpdate;
    }
    public void finish(Database.BatchableContext bc){
        AsyncApexJob job = [SELECT Id, Status, NumberOfErrors,
                            JobItemsProcessed,
                            TotalJobItems, CreatedBy.Email
                            FROM AsyncApexJob
                            WHERE Id = :bc.getJobId()];
        
        String subject = 'Year End Gift Batches complete';
        String body = 'records processed ' + recordsProcessed.format() + '. The batch apex processed '+ job.TotalJobItems;
        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        // Now sets the below paramaters of the email object
        email.setSubject( subject );
        // Here I am accessing current user email id to whom we are sending email
        email.setToAddresses( new String[] {UserInfo.getUserEmail()} );
        email.setPlainTextBody( body );
        // Sends the email
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});  
        system.debug('records processed: ' + recordsProcessed);
        emailLimits = Limits.getEmailInvocations();
        system.debug ('emaillimits:' + emailLimits);
        if (r[0].success) {
            System.debug('The email was sent successfully to ' + UserInfo.getUserEmail());
        } else {
            System.debug('The email failed to send: '+ r[0].errors[0].message);
            FeedItem post = new FeedItem();
            post.ParentId = UserInfo.getUserId(); 
            post.Body = body;
            List<FeedItem> postList= new List<FeedItem>();
            postList.add(post);
            Insert postList;
        }  
    }
    
    
}

yearEndCampaignTest.apxc

//Code by Jessie Rymph
//December 30, 2021
//Tests the Year End Gift Campaign process using the YearEndtestDataFactory class
//https://wp.me/p9qPLI-1q8

@isTest
public class yearEndCampaignTest {
    @isTest static void positiveTest() {
        // Test data setup
        // Create contacts with opps through test utility
        Integer testNumC= 20;
        Integer testNumO = 20;
        contact[] cons = YearEndTestDataFactory.createContactsWithOpps(testNumC,testNumO);
        
        Test.startTest();
        	yearEndCampaignTable yEGB = new yearEndCampaignTable();
        	Id batchId = Database.executeBatch(yEGB);
        Test.stopTest();        
        List<Contact> contacts = new List<Contact>();

        for(Contact person : [SELECT Id, Gifts_Last_Year__c FROM Contact]) {
            if(person.Gifts_Last_Year__c.contains('Campaign')) {
                contacts.add(person);
            }
        }
        System.assertEquals(testNumC,contacts.size(),testNumC +' ');
       
    }
    
    @isTest static void negativeTest() {
        // Test data setup
        // Create contacts with opps through test utility
        Integer testNumC=10;
        Integer testNumO = 5;
        contact[] cons = YearEndTestDataFactory.wrongYearOpps(testNumC,testNumO);
        
        Test.startTest();
        	yearEndCampaignTable yEGB = new yearEndCampaignTable();
        	Id batchId = Database.executeBatch(yEGB);
        Test.stopTest();        
        List<Contact> contacts = new List<Contact>();

        for(Contact person : [SELECT Id, Gifts_Last_Year__c FROM Contact]) {
           
            IF(person.Gifts_Last_Year__c != null) { 
                contacts.add(person);
            }
            
        }
        System.assertEquals(0,contacts.size(),'Expected none, got' + contacts.size());

    }
    

    @IsTest
    static void testThatEmailWasSent(){
        Integer testNumC= 20;
        Integer testNumO = 20;
        contact[] cons = YearEndTestDataFactory.createContactsWithOpps(testNumC,testNumO);
        
        Test.startTest();
        //System.assertEquals(0, Limits.getEmailInvocations(), 'No emails should be sent');
        yearEndCampaignTable yEGB = new yearEndCampaignTable();  	
        Id batchId = Database.executeBatch(yEGB);
        Test.stopTest();
		System.assertEquals(1,yearendCampaignTable.emaillimits);
    }
}

YearEndGiftBatch.apxc

//Code by Jessie Rymph
//December 30, 2021
//
//launch in execute anonymous by pasting in the next line without the two //
//Id batchJobId = Database.executeBatch(new yearEndGiftBatch());
//https://wp.me/p9qPLI-1q8

public class yearEndGiftBatch implements Database.Batchable<sObject>,Database.Stateful {
    //instance member to retain state across transactions
    public static Integer emailLimits;
    public Integer recordsProcessed =0;
    
    public Database.QueryLocator start(Database.BatchableContext bc) {
        Integer year = Date.Today().year()-1; 

        return Database.getQueryLocator([SELECT LastName, id,Gifts_Last_Year__c, (SELECT Id, CloseDate, Amount FROM Opportunities 
                                                                                  WHERE CALENDAR_YEAR(CloseDate) =:year AND IsWon = True ORDER 
                                                                                  BY CloseDate) FROM Contact WHERE npo02__OppAmountLastYear__c > 0 WITH SECURITY_ENFORCED]);          
    }
    
    public void execute(Database.BatchableContext bc, List<Contact> scope) {
        //process each batch of records
        List<Contact> contactsForUpdate = new List<Contact>();
        String loopString;
        String longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th></tr>';
        String dateFormatString = 'MMMM d, yyyy';
        String finalString;
        for (Contact con : scope) {
            for (Opportunity opp : con.opportunities) {
                Date d = opp.CloseDate;
                Datetime dt = Datetime.newInstance(d.year(), d.month(),d.day());
                String dateString = dt.format(dateFormatString);
                String cleanAmt = String.valueOf(opp.Amount);
                
                loopString =
                    '<tr> <td style="border: 1px solid black; padding: 15px;">' + dateString +
                    '</th> <td style="border: 1px solid black; padding: 15px;"> $' + cleanAmt + '</th> </tr>' 
                longestString = longestString + loopString;
            }
            finalstring = longestString + '</table>';
            con.Gifts_Last_Year__c = String.escapeSingleQuotes(finalstring);
            contactsForUpdate.add(con);
            //reset the value of longestString to the start. otherwise it's going to add everyone's gifts to the list and keep growing. 
			longestString = '<table style="width:100%; border: 1px solid black;"><tr><th style="border: 1px solid black; padding: 15px;"> Date</th>   <th style="border: 1px solid black;">Amount</th></tr>';
            recordsProcessed = recordsProcessed + 1;
             system.debug('Final String' + finalstring);
        }
        update contactsForUpdate;
    }
    public void finish(Database.BatchableContext bc){
        AsyncApexJob job = [SELECT Id, Status, NumberOfErrors,
                            JobItemsProcessed,
                            TotalJobItems, CreatedBy.Email
                            FROM AsyncApexJob
                            WHERE Id = :bc.getJobId()];
        
        String subject = 'Year End Gift Batches complete';
        String body = 'records processed ' + recordsProcessed.format() + '. The batch apex processed '+ job.TotalJobItems;
        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        // Now sets the below paramaters of the email object
        email.setSubject( subject );
        // Here I am accessing current user email id to whom we are sending email
        email.setToAddresses( new String[] {UserInfo.getUserEmail()} );
        email.setPlainTextBody( body );
        // Sends the email
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});  
        system.debug('records processed: ' + recordsProcessed);
        emailLimits = Limits.getEmailInvocations();
        system.debug ('emaillimits:' + emailLimits);
        if (r[0].success) {
            System.debug('The email was sent successfully to ' + UserInfo.getUserEmail());
        } else {
            System.debug('The email failed to send: '+ r[0].errors[0].message);
            FeedItem post = new FeedItem();
            post.ParentId = UserInfo.getUserId(); 
            post.Body = body;
            List<FeedItem> postList= new List<FeedItem>();
            postList.add(post);
            Insert postList;
        }  
    }
    
    
}

yearEndGiftBatchTest.apxc

//Code by Jessie Rymph
//December 30, 2021
//Tests the Year End Gift Batch process using the YearEndtestDataFactory class
//https://wp.me/p9qPLI-1q8

@isTest
public class yearEndGiftBatchTest {
    @isTest static void positiveTest() {
        // Test data setup
        // Create contacts with opps through test utility
        Integer testNumC= 20;
        Integer testNumO = 20;
        contact[] cons = YearEndTestDataFactory.createContactsWithOpps(testNumC,testNumO);
        
        Test.startTest();
        	yearEndGiftBatch yEGB = new yearEndGiftBatch();
        	Id batchId = Database.executeBatch(yEGB);
        Test.stopTest();        
        List<Contact> contacts = new List<Contact>();

        for(Contact person : [SELECT Id, Gifts_Last_Year__c FROM Contact]) {
            if(person.Gifts_Last_Year__c.contains('Date')) {
                contacts.add(person);
            }
        }
        System.assertEquals(testNumC,contacts.size(),testNumC +' ');
       
    }
    
    @isTest static void negativeTest() {
        // Test data setup
        // Create contacts with opps through test utility
        Integer testNumC=10;
        Integer testNumO = 12;
        contact[] cons = YearEndTestDataFactory.wrongYearOpps(testNumC,testNumO);
        
        Test.startTest();
        	yearEndGiftBatch yEGB = new yearEndGiftBatch();
        	Id batchId = Database.executeBatch(yEGB);
        Test.stopTest();        
        List<Contact> contacts = new List<Contact>();

        for(Contact person : [SELECT Id, Gifts_Last_Year__c FROM Contact]) {
           
            IF(person.Gifts_Last_Year__c != null) { 
                contacts.add(person);
            }
            
        }
        System.assertEquals(0,contacts.size(),'Expected none, got' + contacts.size());

    }
    

    @IsTest
    static void testThatEmailWasSent(){
        Integer testNumC= 20;
        Integer testNumO = 20;
        contact[] cons = YearEndTestDataFactory.createContactsWithOpps(testNumC,testNumO);
        
        Test.startTest();
        yearEndGiftBatch yEGB = new yearEndGiftBatch();  	
        Id batchId = Database.executeBatch(yEGB);
        Test.stopTest();
		System.assertEquals(1,yearendGiftbatch.emaillimits);
    }
}

yearEndtestDataFactory.apxc

//Code by Jessie Rymph
//December 30, 2021

//https://wp.me/p9qPLI-1q8

@isTest 
public class yearEndtestDataFactory {
    
    public static Id devRecordTypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('Donation').getRecordTypeId();
    
    //positive test
    public static List<Contact> createContactsWithOpps(Integer numCts, Integer numOppsPerCt){
        //create Test Data
        Campaign camp = new Campaign (Name = 'Annual Fund');
        insert camp;
        
        List<Contact> cons = new List<Contact>();
        
        for(Integer i=0;i<numCts;i++) {
            Contact a = new Contact(LastName='Test'+i,Email='basket@gmail.com',npo02__OppAmountLastYear__c=40);
            Cons.add(a);
        }
        insert Cons;
        system.debug('insert' + cons);
        
        List<Opportunity> opps = new List<Opportunity>();
        
        for (Integer j=0;j<numCts;j++) {
            Contact connie = Cons[j];
            //get the year of last year. start by getting today's date.
            Date myDate = system.today();
            //get the year from the date
            Integer thisYear = myDate.year();
            //subtract one to make it last year
            Integer lastYear = thisYear - 1;
            //set a date variable for January 1 of last year. This will be the first gift date.
            Date janDate = Date.newInstance(lastyear, 1, 1);
            // For each contact just inserted, add opportunities
            for (Integer k=0;k<numOppsPerCt;k++) {
                opps.add(new Opportunity(Name=connie.Name + ' Opportunity ' + k,
                                         recordTypeid= devRecordTypeId,
                                         AccountId=connie.AccountId,
                                         StageName='Closed Won',
                                         CampaignId = camp.Id,
                                         //for each opp created use the JanDate variable, one month later
                                         CloseDate=janDate.addmonths(k),
                                         Amount=k+990,
                                         npsp__Primary_Contact__c=connie.Id));
            }
        }
        // Insert all opportunities for all accounts.
        insert opps;
        system.debug('all Test Opps created');
        return cons;
        
    }
    public static List<Contact> wrongYearOpps(Integer numCts, Integer numOppsPerCt){
        //Id devRecordTypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('Donation').getRecordTypeId();    
        //create Test Data with gifts that are not last year
        Campaign camp = new Campaign (Name = 'Annual Fund');
        insert camp;
        
        List<Contact> cons = new List<Contact>();
        for(Integer i=0;i<numCts;i++) {
            Contact a = new Contact(LastName='Test'+i,Email='basket@gmail.com',npo02__OppAmountLastYear__c=40);
            Cons.add(a);
        }
        insert Cons;
        system.debug('insert' + cons);
        
        List<Opportunity> opps = new List<Opportunity>();
        
        for (Integer j=0;j<numCts;j++) {
            Contact connie = Cons[j];
            //get today's date
            Date myDate = system.today();
            //get the year from the date
            Integer thisYear = myDate.year();
            //set a date variable for January 1 of this year. This will be the first gift date.
            Date janDate = Date.newInstance(thisyear, 1, 1);
            // For each contact just inserted, add opportunities
            for (Integer k=0;k<numOppsPerCt;k++) {
                opps.add(new Opportunity(Name=connie.Name + ' Opportunity ' + k,
                                         recordTypeid=devRecordTypeId,
                                         AccountId=connie.AccountId,
                                         StageName='Closed Won',
                                         CampaignId = camp.id,
                                         //for each opp created use the JanDate variable and add one year
                                         CloseDate=janDate.addyears(k),
                                         Amount=k+990,
                                         npsp__Primary_Contact__c=connie.Id));
            }
        }
        // Insert all opportunities for all accounts.
        insert opps;
        system.debug('all Test Opps created');
        return cons;
        
    }
}

This code goes with the AppExchange package for Nonprofit Donation Receipt. https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3u00000Pu8bOEAR