HI , I have a trigger for which I am trying to write a test class

Business Scenario if the stage changes then chk/unchk the box and the stage should be checked for the Primary record

set < id > ids2 = new set < id > ();
 set < id > Checkids = new set < id > ();
        set < id > Uncheckids = new set < id > ();
        if (trigger.isinsert || trigger.isupdate) {
            for (Proposal__Proposal__c p: trigger.new) {
                if (p.Proposal__Primary__c == true && p.Proposal__Approval_Stage__c == 'Accepted') {
                    Checkids.add(p.Proposal__Opportunity__c);
                }
                if (p.Proposal__Primary__c == true && p.Proposal__Approval_Stage__c != 'Accepted') {
                    Uncheckids.add(p.Proposal__Opportunity__c);
                }
                if (p.Proposal__Primary__c == false && p.Proposal__Approval_Stage__c == 'Accepted') {
                    Uncheckids.add(p.Proposal__Opportunity__c);
                }
            }
        }
        list < opportunity > opptoupdate = new list < opportunity > ();
        for (opportunity o: [select id, Has_Primary_Accepted_Quote_Proposal__c from opportunity where id in : Checkids and Has_Primary_Accepted_Quote_Proposal__c = false]) {
            o.Has_Primary_Accepted_Quote_Proposal__c = true;
            opptoupdate.add(o);
        }
        for (opportunity o: [select id, Has_Primary_Accepted_Quote_Proposal__c from opportunity where id in : Uncheckids and Has_Primary_Accepted_Quote_Proposal__c = true]) {
            o.Has_Primary_Accepted_Quote_Proposal__c = false;
            opptoupdate.add(o);
        }
        if (opptoupdate.size() > 0) {
            update opptoupdate;
        }
} else {
        if (trigger.isdelete) {

            for (Proposal__Proposal__c p: trigger.old) {
                if (p.Proposal__Primary__c == true ) {
                    ids2.add(p.Proposal__Opportunity__c);
                }
            }
        }