public void updateLastActivityDate(){

    Map<Id, Application__c> applicationMap = new Map<Id, Application__c>();

    if (Trigger.isAfter && (Trigger.isUpdate)){
        System.debug(LoggingLevel.INFO, 'Test 1');
        for (Application__c application : (List<Application__c>) Trigger.new){
            System.debug(LoggingLevel.INFO, application);
            System.debug(LoggingLevel.INFO, 'Test 1.1');
            if (Utils.isFieldChanging('Follow_Up_Date__c', application, Trigger.oldMap)){
                System.debug(LoggingLevel.INFO, 'Test 1.2');
                applicationMap.put(application.Id, application);
                System.debug(LoggingLevel.INFO, applicationMap);
            }
        }
    }



    System.debug(LoggingLevel.INFO, 'Task 1.3');
    if (applicationMap.size() > 0){

        System.debug(LoggingLevel.INFO, 'Task 1.4');
        List<Task> tasks = [SELECT Id, CreatedDate, WhatId FROM Task WHERE WhatId IN :applicationMap.keySet() AND CreatedDate = TODAY];

        List<Application__c> applicationsToUpdate = new List<Application__c>();
        System.debug(LoggingLevel.INFO, 'Task 1.5');
        if (tasks.isEmpty()){
            for (Application__c application : (List<Application__c>) Trigger.new){
                    System.debug(LoggingLevel.INFO, 'Test error message');
                    application.addError('An activity must be logged today to change the Follow-Up Date');
            }
        System.debug(LoggingLevel.INFO, 'Test 1.6');
        if (tasks.size() > 0){
            for (Id applicationId : applicationMap.keySet()){
                Application__c app = applicationMap.get(applicationId);
                if (app != null){
                    Application__c a = new Application__c(
                    Id=applicationId,
                    Last_Activity_Date__c = System.TODAY()
                    );
                    applicationsToUpdate.add(a);
                    System.debug(LoggingLevel.INFO, applicationsToUpdate);
                }
            }

            if (applicationsToUpdate.size() > 0){
                update applicationsToUpdate;
                System.debug(LoggingLevel.INFO, applicationsToUpdate);
            }
        }
    }
}
}

static testMethod void updateLastActivityDate(){
    //CaseShareDelete.doChainJob = false;
    TestFuel fuel = new TestFuel();
    Utils u = new Utils();

    User thisUser = [SELECT Id FROM User WHERE Id = :UserInfo.getUserId()];

    Profile p = [SELECT Id, Name FROM Profile WHERE Name = 'WV Operations Users'];
    User u1 = fuel.newOperationsUser();
    insert u1;

        System.runAs(u1){
            Account account = fuel.newAccount();
            Account carrier = fuel.newCarrierAccount();
            Account brokerDealer = fuel.newBrokerDealerAccount();
        insert new List<Account>{account, carrier, brokerDealer};

        Contract contract = fuel.newContract();
        contract.RecordTypeId = '01236000000SBRzAAO';
        contract.AccountId = account.Id;
        contract.Status = 'Draft';
        insert contract;

        Territory__c territory = fuel.newTerritory();
        insert territory;

        Contact contact = fuel.newContact();
        contact.RecordTypeId = '012360000008QLxAAM';
        contact.AccountId = account.Id;
        contact.Broker_Dealer__c = brokerDealer.Id;
        contact.Wealthvest_Producer_ID__c = contract.Id;
        contact.Contact_Stage__c = '6 - Contracted Producer';
        contact.Territory__c = territory.Id;
        insert contact;

        Appointment__c appointment = fuel.newCarrierAppointment();
        appointment.Producer_Contact__c = contact.Id;
            appointment.Carrier__c = carrier.Id;
            appointment.WV_Producer_Contract__c = contract.Id;
            //appointment.Status__c = null;
            appointment.Carrier_Appointment_Stage__c = '4-Pending with Carrier';
            insert appointment;

        CarrierLine__c carrierLine = fuel.newCarrierLine();
        carrierLine.Carrier__c = carrier.Id;
        insert carrierLine;

        CarrierLineProduct__c product = fuel.newProduct();
        product.Carrier__c = carrier.Id;
        product.CarrierLine__c = carrierLine.Id;
        insert product;

            Application__c application = fuel.newApplication();
            application.RecordTypeId = '01236000000SKvhAAG';
            application.Policy_Number__c = 'W92745100';
            application.Tax_Status__c = 'Qualified';
            application.Gender__c = 'Male';
            application.Age__c = 43;
            application.Application_Stage__c = '00 - WV Preliminary App Review';
            application.Status__c = 'Reviewed by WV, App Not Submitted to Carrier';
            application.Investor__c = 'Sam Test';
        application.Carrier__c = carrier.Id;
            application.Product_Carrier__c = product.Id;
            application.Submitted_Premium__c = 100000;
            application.Sign_Date__c = System.today() - 7;
            application.Signed_State__c = 'CA';
            application.Application_Sent_To__c = 'WealthVest';
            application.Issue_Status_Only__c = 'Full Case Management';
            application.DOB__c = Date.newInstance(1975, 12, 9);
            application.Received_Date__c = System.today() - 2;
            application.Submitted__c = System.today();
            application.Submitted_Premium__c = 100000;
            application.Investor_SSN__c = '756342132';
            application.Carrier_Appointment__c = appointment.Id;
        insert application;

            Application_Line_Item__c ali = fuel.newApplicationLine();
            ali.Application__c = application.Id;
            insert ali;

            Producer_Application_Line_Item__c pali = fuel.newProducerApplicationLineItem();
        pali.Application_Line_Item__c = ali.Id;
        pali.Producer__c = contact.Id;
        pali.Split_pct__c = 100.00;
        insert pali;

        List<Application__c> applicationList = [SELECT Id FROM Application__c WHERE Id = :application.Id];
        System.assertEquals(1, applicationList.size());

        Test.startTest();

        List<Task> taskList = [SELECT Id, WhatId, CreatedDate FROM Task WHERE WhatId = :application.Id];
        System.assertEquals(true, taskList.isEmpty());

        try{
                application.Follow_Up_Date__c = System.today() + 2;
                update application;
            } catch(Exception e) {
            System.Assert(e.getMessage().contains('An activity must be logged today to change the Follow-Up Date'));
        }

        applicationList = [SELECT Id, Follow_Up_Date__c, Last_Activity_Date__c FROM Application__c WHERE Id = :application.Id];
            System.assertEquals(null, applicationList[0].Last_Activity_Date__c);
            System.assertNotEquals(System.today(), applicationList[0].Follow_Up_Date__c);

        Task task = new Task();
            task.recordTypeId = '01236000000OkDPAA0';
            task.ActivityDate = System.today();
        task.WhatId = application.Id;
        task.Type = 'OutBound Phone Call';
            task.Subject = 'Call';
            task.Status = 'Completed';
            task.CreatedDate = System.now() -1;
            task.LastModifiedDate = System.now() -1;
            Task task2 = new Task();
            task2.recordTypeId = '01236000000OkDPAA0';
            task2.ActivityDate = System.today() + 2;
        task2.WhatId = application.Id;
        task2.Type = 'Email';
            task2.Subject = 'Email';
            task2.Status = 'Completed';
            task2.CreatedDate = System.now();
            task2.LastModifiedDate = System.now();
            insert new List<Task>{task, task2};

        taskList = [SELECT Id, WhatId, CreatedDate FROM Task WHERE WhatId = :application.Id];
        System.assertEquals(2, taskList.size());

        application.Follow_Up_Date__c = System.today();
        update application;

        applicationList = [SELECT Id, Follow_Up_Date__c, Last_Activity_Date__c FROM Application__c WHERE Id = :application.Id];
            System.assertEquals(System.today(), applicationList[0].Last_Activity_Date__c);
            System.assertEquals(System.today(), applicationList[0].Follow_Up_Date__c);
Test.stopTest();
        }
}

if (Trigger.isAfter && (Trigger.isUpdate || Trigger.isInsert)){
        if (ApplicationHandler.firstRun){
            handler.firstApplicationRun();
            handler.updateLastActivityDate();