I'm fairly new to Apex development and am trying to get the hang of how to write these tests for triggers, but am having a tough time with this.  Any help is appreciated.

Here is the trigger:

trigger updOpportunityFromLeadConvert on Lead (before update) {

    Map<Id,String> leadIndustry     = new Map<Id,String>(); 
    Map<Id,String> leadHowHear      = new Map<Id,String>(); 
    Map<Id,String> leadOther        = new Map<Id,String>(); 
    Map<Id,String> leadDescription  = new Map<Id,String>();
    Map<Id,String> leadSource       = new Map<Id,String>();
    Map<Id,String> iiSolution       = new Map<Id,String>(); 
    
    date myDate = date.today();
    date trialCloseDate = myDate.addDays(30);
    
    for(Lead lead : Trigger.new) {
        if (lead.IsConverted) {
            leadIndustry.put(lead.ConvertedOpportunityId,lead.Industry);
            leadHowHear.put(lead.ConvertedOpportunityId,lead.How_did_you_hear_about_us__c);
            leadOther.put(lead.ConvertedOpportunityId,lead.Other__c);
            leadDescription.put(lead.ConvertedOpportunityId,lead.Description);
            if(lead.LeadSource=='Web Trial'){
                leadSource.put(lead.ConvertedOpportunityId,'In Trial');
            }else{
                leadSource.put(lead.ConvertedOpportunityId,'Targeted Leads');
            }
            if(lead.LeadSource=='Web Trial'){
                iiSolution.put(lead.ConvertedOpportunityId,'i2Dashboard');
            }
        }
    }
    
    List<Opportunity> conOpp = [Select  Id  From Opportunity  WHERE Opportunity.Id IN :leadIndustry.keySet()];
    
    for ( Opportunity o : conOpp) {
        o.Industry_Sector__c = leadIndustry.get(o.Id);
        o.How_did_you_hear_about_us__c = leadHowHear.get(o.Id);
        o.Other__c = leadOther.get(o.Id);
        o.Description = leadDescription.get(o.Id);
        o.StageName = leadSource.get(o.Id);
        o.iiSolution__c = iiSolution.get(o.Id);
        o.Type = 'New (N)';
        o.CloseDate = trialCloseDate;
        
    }
    update conOpp;
}

Here is the test I've written so far (with a few errors in the code already that I'm aware of).  I'm just stuck on this.

@isTest
private class updOpportunityFromLeadConvertTest {

    static testMethod void testUpdOpportunityFromLeadConvert(){
    	
    	// set 30 days from now
        date myDate = date.today();
    	date trialCloseDate = myDate.addDays(30);
    	
    	// create list to hold leads
    	List<Lead> leads = new List<Lead>{};
    	converts = new List[];
    	
    	// loop 200 times to make 200 leads, add to list
        for(Integer i=0; i < 200; i++){
        	Lead ld = new Lead(
        		Company='TestCo' + i, 
        		Description='Refer/Browser/Ip Info', 
        		Email='user@testco.com', 
        		Industry='Alternative Energy', 
        		LeadSource='Web Trial', 
        		Status='Incomplete Registration', 
        		FirstName='Joe', 
        		LastName='Blow', 
        		Phone='310-555-1212', 
        		Title='Senior Janitor', 
        		How_did_you_hear_about_us__c='i2live event', 
        		Other__c='beetlemania', 
        		Type__c='Lead');
        	leads.add(ld);	
       }
        
        // start test
        test.startTest();
       
        // insert lead        
        insert leads;

        
        for(Lead l : leads){
	        //Convert the lead
	        Database.LeadConvert lc = new database.LeadConvert();
	        lc.setLeadId(l.Id);
	        
	        
	        //Set the converted status
	        LeadStatus convertStatus = [Select Id, MasterLabel from LeadStatus where IsConverted=true limit 1];
			lc.setConvertedStatus(convertStatus.MasterLabel);
	        
	        // Commit the converted lead
	        Database.Leadconvertresult lcr = Database.convertLead(lc); 
	        
	        converts.add(lcr.getOpportunityId());
        }
        
        // stop test
        test.stopTest();
        
        // Query the db for Opportunities converted from Lead
        List<Opportunity> convertOpp = [Select Industry_Sector__c, How_did_you_hear_about_us__c, Other__c,
        									  Description, StageName, iiSolution__c, Type, CloseDate
        								from Opportunity
        								Where Id IN :leads.Id];

        // Assert fields have right values
        for(Opportunity o : convertOpp){
    		System.assertEquals('Alternative Energy', o.Industry_Sector__c); 
    		System.assertEquals('i2live event', o.How_did_you_hear_about_us__c); 
    		System.assertEquals('beetlemania', o.Other__c);
			System.assertEquals('Refer/Browser/Ip Info', o.Description); 
    		System.assertEquals('In Trial', o.StageName);
    		System.assertEquals('i2Dashboard', o.iiSolution__c);
    		System.assertEquals('New (N)', o.Type);
			System.assertEquals(trialCloseDate, o.CloseDate);
    		
        }
        
        
    
    }


}