It appears that I have code that works perfectly in both a production and a sandbox environment, but does not work when called from a unit test that performs the same operations that work just fine using the GUI.

I've modified the CampaignCallDownController to have filters and a search box.  The below test adds one Contact and one Lead to a Campaign, then invokes the CampaignCallDown VF page and controller.  When I do those steps using the GUI in production or the sandbox, the call list shows two records, one Contact and one Lead.  But when I run this unit test, it says there are zero records in the call list.  I've tracked the problem down to this query in the CampaignCallDownController...

members = [select Id, ContactId, LeadId, Status, CampaignId, Level_of_Interest__c, 

                    Last_Action__c, Next_Action__c, Campaign.Name,

                    Lead.Id, Lead.Salutation, Lead.Title, Lead.Name, Lead.Company, Lead.Phone, 

                    Lead.Street, Lead.State, Lead.Email,

                    Contact.ID, Contact.AccountId, Contact.Salutation, Contact.Title, Contact.Name, 

                    Contact.Phone, Contact.MailingState, Contact.Email, Contact.Account.name

                    from CampaignMember where CampaignId = :camp AND Next_Action__c LIKE :desiredNA AND 

                    (NOT Next_Action__c LIKE :excludedNA) AND Level_of_Interest__c LIKE :desiredLI AND 

                    (NOT Level_of_Interest__c LIKE :excludedLI) AND

                    (Contact.Account.Name LIKE :searchFilter OR Contact.Name LIKE :searchFilter

ORContact.Email LIKE :searchFilter 

                    OR Contact.Title LIKE :searchFilter OR Contact.MailingState LIKE :searchFilter OR 

                    Lead.Name LIKE :searchFilter OR Lead.Company LIKE :searchFilter  OR 

                    Lead.Email LIKE :searchFilter OR Lead.Title LIKE :searchFilter OR Lead.State LIKE :searchFilter) 

                    ORDER BY Contact.Account.name LIMIT :recordsPerPage OFFSET :offset ];

I've highlighted the part of the query that performs the search function because that's where the problem is.  When that query gets called from the GUI, it will return all Leads *and* Contacts that match the searchFilter criteria.  But when called from the test, it will only return an empty list, not matter what search or filter criteria are input.  I've stripped the query criteria down to just the red and blue parts and found that if I remove one or the other (the Contact field matching or the Lead field matching criteria) it will return records when called from the below test.  In other words, if I remove the red part it will return 1 Lead in the test below.  Or, if I leave in the red part and remove the blue part, it will return 1 Contact in the test below.  But, if I leave both in, it will return zero leads and zero contacts.  When the same operations are performed in the GUI, it returns two records - both the Lead and the Contact.

Anybody know what's going  on?  Have I hit a bug in the way tests are executed by SFDC?  I'm about to pull my hair out - or write a unit test that is really a non-test!! :(

@isTest
private class CampaignCallDownControllerTest {

     static testMethod void testNormalFlow(){
     	
     	//get campaign member record type ID
     	RecordType rt = [select id,Name from RecordType where SobjectType='CampaignMember' and Name='Email Campaign Member' Limit 1];
     	
        //campaign
        Campaign testCampaign       = new Campaign();
        testCampaign.name           = 'TestCampaign';
        testCampaign.CampaignMemberRecordTypeId = rt.ID;
        insert testCampaign;
        
        Account testAccount		= new Account();
        testAccount.name		= 'TestAccount';
        insert testAccount;  
                
        //Lead
        Lead testLead1          = new Lead();
        testLead1.FirstName     = 'LeadFirstName1';
        testLead1.LastName      = 'LeadLastName1';
        testLead1.Company       = 'Test1';
        insert testLead1;
        
        //Contact
        Contact testContact1         = new Contact();
        testContact1.FirstName       = 'ContactFirstName';
        testContact1.LastName        ='ContactLastName';
        testContact1.Email           = 'Adress1@Adress.com';
        testContact1.Title           = 'ContactTitle';
        testContact1.AccountID 		 = testAccount.ID;
        insert testContact1;
        
        //make campaign members
        CampaignMember testCM1       = new CampaignMember();
        testCM1.leadID               = testLead1.Id;
        testCM1.contactID			 = null;
        testCM1.campaignID           = testCampaign.Id;
        testCM1.Status               = 'Sent';
        testCM1.Level_of_Interest__c = 'Interested';
        testCM1.Next_Action__c 		 = 'contact now';
        insert testCM1;
        
        CampaignMember testCM3      = new CampaignMember();
        testCM3.ContactId           = testContact1.Id;
        testCM3.LeadID			 	= null;
        testCM3.CampaignId          = testCampaign.Id;
        testCM3.Status              = 'Sent';
        testCM3.Level_of_Interest__c= 'Interested';        
        testCM3.Next_Action__c 		= 'contact now';
        insert testCM3;
        
		// Check to make sure the contacts and leads made it into the campaign        
        testCampaign = [SELECT ID, NumberofContacts, NumberOfLeads FROM Campaign WHERE ID = :testCampaign.ID];       
        System.assertEquals(1,testCampaign.NumberofContacts);
        System.assertEquals(1,testCampaign.NumberofLeads);
                
        //begin tests
 		// instantiate page
 		PageReference pageRef = Page.CampaignCallDown;
 		Test.setCurrentPage(pageRef);
 		ApexPages.currentPage().getParameters().put('camp',testCampaign.Id);

        CampaignCallDownController ccdc1 = new CampaignCallDownController();
	System.assert(ccdc1.getHasCampaignID() == TRUE);
	System.assertequals(2, ccdc1.getLeadPlusTasks().size()); // FAILS HERE
		 		
 	}