trigger setOnlineDocket on Opportunity (before insert, before update) {
    
    List<Campaign> lstCampaign=[Select Id from Campaign where Name='Online Campaign'];
    if(!lstCampaign.isEmpty()){
        for(Opportunity opp:Trigger.New){
            if(opp.StageName=='Review' && opp.CampaignId!=lstCampaign[0].Id){
                opp.CampaignId=lstCampaign[0].Id;
            }
        }
    }
}




@isTest
private class setOnlineDocketTestClass {
	static testMethod void validatesetOnlineDocket() {
		// Create Test Campaign
		List<Campaign> campNew = new List<Campaign>();
		campNew.add(new Campaign(Name = 'Test Online Campaign', IsActive = True, Type = 'Online Campaign', Meeting_Date__c = System.now()));
		insert campNew;
        
        // Verify campaign inserted successfully
		List<Campaign> newCampaign = [SELECT Name FROM Campaign WHERE Id IN :campNew];
        System.assertEquals('Test Online Campaign', newCampaign.Name);
        System.Debug('Campaign Created: ' + newCampaign.Name);
		
		// Create Test Account
		Account accNew = new Account(Name='M Test Account', Letter__c = True);
		insert accNew;
		
		// Verify that the initial state is as expected.
		accNew = [SELECT Name FROM Account WHERE Id = :accNew.Id];
		System.assertEquals('M Test Account', accNew.Name);
        System.Debug('Account Created: ' + accNew.Name);
		
		// Create Test Contact
		Contact conNew = new Contact(AccountId = accNew.Id, lastname = 'Testing', firstname = 'Apex');
		insert conNew;
		
		// Verify contact inserted successfully
		conNew = [SELECT lastname FROM Contact WHERE Id = :conNew.Id];
		System.assertEquals('Testing', conNew.lastname);
        System.Debug('Contact Created: ' + conNew.Name);
		
		// Create Test Opportunity
		Opportunity oppNew = new Opportunity(RecordTypeId = '012A0000000d8jR', AccountId = accNew.Id, Name = 'Maclellan Trigger Test Audit', StageName = 'Committee Review', CloseDate = System.today(), CampaignId = null);
		
        System.Debug('Record Type: ' + oppNew.RecordType + ', AccountId: ' + oppNew.AccountId + ', Opportunity name: ' + oppNew.Name + ', Stage: ' + oppNew.StageName + ', Close Date: ' + oppNew.CloseDate + ', Campaign Id: ' + oppNew.CampaignId);
        insert oppNew;
                
        // Retrieve New Opportunity
        Opportunity oppCreated = [SELECT Name FROM Opportunity WHERE Id = :oppNew.Id];
        System.assertEquals('M Trigger Test Audit', oppCreated.Name);
        System.Debug('Opportunity Created: ' + oppNew.Name);
        
		// Update Opportunity
		oppNew.CampaignId='701G0000000vw7M';
		update oppNew;
		
		// Retrieve Updated Opportunity
		Opportunity oppUpdated = [SELECT CampaignId FROM Opportunity WHERE Id = :oppNew.Id];
		 
		// Test that the trigger updated campaign
		System.assertEquals('701G0000000vw7M', oppUpdated.CampaignId);
		System.Debug('Opportunity Updated with CampaignId: ' + oppUpdated.CampaignId);	
    }
}