need test covrage class for salesforce trigger - class

Question

I need to write test class for following trigger so that i can increase test covrage for to upload package on salesforce. I dont to how to write test class for triggers.
Trigger AutoActivityCreation on Account(after update)
{
List<Task> task = new List<Task>();
for (Integer i = 0; i < Trigger.new.size(); i++) {
List<String> techs = Trigger.new[i].Toolsberry_new_tech_installs__c.split(';');
Integer added_tech = techs.size();
if(Trigger.new[i].Toolsberry_new_tech_installs__c=='null'){
added_tech=0;
}
List<String> re_techs = Trigger.new[i].Toolsberry_removed_tech_installs__c.split(';');
Integer removed_tech = re_techs.size();
if(Trigger.new[i].Toolsberry_removed_tech_installs__c=='null'){
removed_tech=0;
}
task.add(new Task(
whatid=Trigger.new[i].Id,
OwnerId=Trigger.new[i].OwnerId,
Subject='Technologies Added '+added_tech+' , Removed '+removed_tech,
Status = 'Completed',
ActivityDate = system.today()
) ) ;
}
insert task;
}
can anybody help for this how to write test covrage class.
Thanks
Rajendra J.

Answer 1

Please check this if it works for you.
#isTest
private class TriggerTestClass {
static testMethod void autoTasktest() {
// TO DO: implement unit test
Account acc = new Account(
Name = 'Test Account 1',
Phone = '07123123123',
Toolsberry_new_tech_installs__c = 'null',
Toolsberry_removed_tech_installs__c = 'null');
insert acc;
acc.BillingCity = 'Test Area 2';
update acc;
}
}
and make sure you add the fields with values in your test method which are required in account object. It will give you best coverage.