Hi

I am bit confused inw riting a test class for the following trigger. Please help me out in this

trigger PerfMetricUpdate on Performance_Metric__c (after update) 
{
  Performance_Metric__c[] pm = Trigger.new;
  
  if(pm[0].Monthly_Recurring_Other_Quota__c != Trigger.oldMap.get(pm[0].Id).Monthly_Recurring_Other_Quota__c ||
  pm[0].Monthly_Recurring_Data_Quota__c != Trigger.oldMap.get(pm[0].Id).Monthly_Recurring_Data_Quota__c ||
  pm[0].Monthly_CPE_Revenue_Quota__c != Trigger.oldMap.get(pm[0].Id).Monthly_CPE_Revenue_Quota__c ||
  pm[0].Monthly_Recurring_Other_Amt_Attained__c != Trigger.oldMap.get(pm[0].Id).Monthly_Recurring_Other_Amt_Attained__c ||
  pm[0].Monthly_Recurring_Data_Amt_Attained__c != Trigger.oldMap.get(pm[0].Id).Monthly_Recurring_Data_Amt_Attained__c ||
  pm[0].Monthly_CPE_Revenue_Amt_Attained__c != Trigger.oldMap.get(pm[0].Id).Monthly_CPE_Revenue_Amt_Attained__c ||
  pm[0].Monthly_CPE_Margin_Quota__c != Trigger.oldMap.get(pm[0].Id).Monthly_CPE_Margin_Quota__c ||
  pm[0].Monthly_CPE_Margin_Amt_Attained__c != Trigger.oldMap.get(pm[0].Id).Monthly_CPE_Margin_Amt_Attained__c)    
  {
    //delete the existing Quota Reporting records for this performance metric
    Quota_Reporting__c[] deleteQR = [select id from Quota_Reporting__c where Performance_Metric__c = :pm[0].Id];
    delete deleteQR;
    
    //build the array
    Quota_Reporting__c[] insertQR = new Quota_Reporting__c[0];
      
    //start building the inserts of each type
    Quota_Reporting__c qr = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Rec Data', Amount__c = pm[0].Monthly_Recurring_Data_Amt_Attained__c);
    insertQR.add(qr);
      
    Quota_Reporting__c qr1 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Rec Data - Quota', Amount__c = pm[0].Monthly_Recurring_Data_Quota__c);
    insertQR.add(qr1);
    
    Quota_Reporting__c qr2 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Rec Other', Amount__c = pm[0].Monthly_Recurring_Other_Amt_Attained__c);
    insertQR.add(qr2);   
   
     Quota_Reporting__c qr3 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Rec Other - Quota', Amount__c = pm[0].Monthly_Recurring_Other_Quota__c);
    insertQR.add(qr3);  
  
     Quota_Reporting__c qr4 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Non Rec', Amount__c = pm[0].Monthly_CPE_Revenue_Amt_Attained__c);
    insertQR.add(qr4);  
  
     Quota_Reporting__c qr5 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Non Rec - Quota', Amount__c = pm[0].Monthly_CPE_Revenue_Quota__c);
    insertQR.add(qr5);  
  
     Quota_Reporting__c qr6 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Non Rec Margin', Amount__c = pm[0].Monthly_CPE_Margin_Amt_Attained__c);
    insertQR.add(qr6);  
   
      Quota_Reporting__c qr7 = new Quota_Reporting__c(Performance_Metric__c = pm[0].Id, Type__c='Non Rec Margin - Quota', Amount__c = pm[0].Monthly_CPE_Margin_Quota__c);
    insertQR.add(qr7);
   
     insert insertQR;
  }
}