test coverage for page reference

public with sharing class SL_CallLogContact_new {
    public String callLogId {get; set;}
    public Call_Log__c callLog {get; set;}
    public Call_Log_Contact__c callLogContact {get; set;}
    private Boolean isError = false;
    public SL_CallLogContact_new()
    {
        callLogId = ApexPages.currentPage().getParameters().get('clid');
        if(callLogId != null)  {
            callLog = [SELECT ID,Company__c FROM Call_Log__c WHERE ID= : callLogId];
            callLogContact = new Call_Log_Contact__c(Call_Log__c = this.callLogId);
        }
    }
    public SL_CallLogContact_new(Boolean myError)
    {        
        callLogId = ApexPages.currentPage().getParameters().get('clid');        
        if(callLogId != null)  {
            callLog = [SELECT ID,Company__c FROM Call_Log__c WHERE ID= : callLogId];
            callLogContact = new Call_Log_Contact__c(Call_Log__c = this.callLogId);
        }
        this.isError = myError;
    }
    public Boolean doSave()
    {
        if (String.valueOf(callLogContact.Contact__c)=='') 
        {
            ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Contact is empty.'));
            return false;
        }
        try
        {
            if (this.isError) {
                Integer I = 100/0;
            }
            ID testID = (ID) String.valueOf(callLogContact.Contact__c);
        }
        catch(Exception ex)
        {
            String contName = String.valueOf(callLogContact.Contact__c);
            callLogContact.Contact__c = null;
            System.debug('#4############################ --------' + String.escapeSingleQuotes(contName));//<-- null???
            for(Contact item : Database.query('select Id,Name from Contact where Name like \''+String.escapeSingleQuotes(contName)+'%\' limit 1'))
            {
                callLogContact.Contact__c = item.id;
            }
            if(callLogContact.Contact__c==null)
            {               
                ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Contact is incorrect.'));
                return false;
            }
        }
        if(callLogContact != null) 
        {
            try {
                insert callLogContact;
                return true;
            } catch (Exception e) {
                if(e.getMessage().contains('INSUFFICIENT')) ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Insufficient Privileges. You do not have the level of access necessary to perform the operation you requested.'));
                else if(e.getMessage().contains('Contacts cannot be duplicated')){}
                else ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, e.getMessage()));
            }
        }
        return false;
    }
    public PageReference save()
    {
        if(this.doSave())
        {
            PageReference res = new PageReference('/'+callLogId);
            res.setRedirect(true);
            return res;
        }
        return null;
    }
    public PageReference saveAndNew()
    {
        if(this.doSave())
        {
            PageReference res = new PageReference('/apex/SL_CallLogContact_new?clid='+callLogId);
            res.setRedirect(true);
            return res;
        }
        return null;
    }
    public PageReference cancel()
    {
        PageReference res = new PageReference('/'+callLogId);
        res.setRedirect(true);
        return res;
    }
}

@isTest(SeeAllData=true)
public class Test_SL_CallLogContact_new {
    static testMethod void cover_SL_CallLogContact_new() 
    {
        ID InvestmentFirm = [SELECT ID FROM RecordType WHERE DeveloperName = 'Investment_Firm' limit 1].ID;
        Account newAccount = new Account(Name = 'Company 3',
                                         BillingCity = 'New York',
                                         BillingState = 'Illinois',
                                         BillingPostalCode = '53200',
                                         WebSite = 'youtube.com',
                                         Phone = '1112123',
                                         RecordTypeId = InvestmentFirm, 
                                         type='Private Equity',
                                         Fax = '123231');
        insert newAccount;
        contact c = new contact( accountid= newAccount.Id, lastname ='xyz', firstname ='abc', email ='abc@xytest.com');
        insert c;
        Project__c newProject = new Project__c(Company__c = newAccount.Id, Name='Test');
        insert newProject;
        Call_Log__c oCallLog = new Call_Log__c(Project__c = newProject.Id, Company__c = newAccount.Id);
        insert oCallLog;
        Call_Log_Contact__c oCallLogContact = new Call_Log_Contact__c(Call_Log__c=oCallLog.Id,contact__c = c.Id);
        insert oCallLogContact;
        ApexPages.currentPage().getParameters().put('clid',oCallLog.Id);
        SL_CallLogContact_new controller = new SL_CallLogContact_new();
        controller.save(); 
        controller.saveAndNew();
        controller.cancel();
    }
    static testMethod void cover_SL_CallLogContact_new_error() 
    {
        ID InvestmentFirm = [SELECT ID FROM RecordType WHERE DeveloperName = 'Investment_Firm' limit 1].ID;
        Account newAccount = new Account(Name = 'Company 3',
                                         BillingCity = 'New York',
                                         BillingState = 'Illinois',
                                         BillingPostalCode = '53200',
                                         WebSite = 'youtube.com',
                                         Phone = '1112123',
                                         RecordTypeId = InvestmentFirm,
                                         type='Private Equity',
                                         Fax = '123231');
        insert newAccount;
        contact c = new contact( accountid= newAccount.Id, lastname ='xyz', firstname ='abc', email ='abc@xytest.com');
        insert c;
        Project__c newProject = new Project__c(Company__c = newAccount.Id, Name='Test');
        insert newProject;
        Call_Log__c oCallLog = new Call_Log__c(Project__c = newProject.Id, Company__c = newAccount.Id);
        insert oCallLog;
        Call_Log_Contact__c oCallLogContact = new Call_Log_Contact__c(Call_Log__c=oCallLog.Id,contact__c = c.Id);
        insert oCallLogContact;
        ApexPages.currentPage().getParameters().put('clid',oCallLog.Id);
        SL_CallLogContact_new controller = new SL_CallLogContact_new(true);
        controller.save(); 
        controller.saveAndNew();
        controller.cancel();
    }
}