Can someone help me in writing the test class for this Apex class..

public class ClsChatterfeed{

    public static void accountCreditCheck(Map<Id, Account> newAccountMap) {
        set<Id> AccountCreditCheckPendingIds = new set<Id>();
        for (Account acc : newAccountMap.values()) {
            if(acc.Please_do_Credit_Check__c == true) {
                AccountCreditCheckPendingIds.add(acc.Id);
            }
        }
        creditCheckUpdate(AccountCreditCheckPendingIds);
    }
   
    public static void accountCreditCheck(Map<Id, Account> newAccountMap, Map<Id, Account> oldAccountMap) {
        set<Id> AccountCreditCheckPendingIds = new set<Id>();
        if(Trigger.isUpdate && Trigger.IsAfter) {
            for (Account acc : newAccountMap.values()) {
                if(oldAccountMap.get(acc.Id).Please_do_Credit_Check__c != acc.Please_do_Credit_Check__c && acc.Please_do_Credit_Check__c == true) {
                    AccountCreditCheckPendingIds.add(acc.Id);
                }
            }
        }
        creditCheckUpdate(AccountCreditCheckPendingIds);
    }
   
    public static void creditCheckUpdate(Set<Id> AccountCreditCheckPendingIds) {
        if(!AccountCreditCheckPendingIds.IsEmpty()) {
            List<Account> accList = new List<Account>();
            for(Account acc : [Select Id, Name, Last_Credit__c, Credit_Check_Requestor1__c from Account where Id =: AccountCreditCheckPendingIds]) {
                acc.Credit_Check_Requestor1__c = UserInfo.getUserId();
                accList.add(acc);
            }
            if (!(accList.isEmpty())) {
                try {
                    update accList;
                } catch(Exception e) {
                }
            }
        }
    }
   
    public static void feedItemCreate(Set<Id> AccountCreditCheckPendingIds) {
        if(runOnce()) {
            if(!AccountCreditCheckPendingIds.IsEmpty()) {
                List<FeedItem> feedItemList = new List<FeedItem>();
                for(Account acc : [Select Id, Name, Last_Credit__c, SystemModstamp, Credit_Check_Requestor1__c, Please_do_Credit_Check__c from Account where Id =: AccountCreditCheckPendingIds]) {
                    if(acc.Last_Credit__c != null && acc.Credit_Check_Requestor1__c != null && acc.Please_do_Credit_Check__c == true) {
                        FeedItem fitem = new FeedItem();
                        fitem.type = 'LinkPost';
                        fitem.ParentId = acc.Credit_Check_Requestor1__c;
                        fitem.LinkUrl = '/' + acc.id;
                        fitem.Title = acc.Name + ' Account';  //This is the title that displays for the LinkUrl
                        fitem.Body = ('Last Credit has been entered at '+acc.SystemModstamp);
                        feedItemList.add(fItem);
                    }
                }
                if(feedItemList.size() > 0 && !feedItemList.isEmpty()) {
                    try {
                        insert feedItemList;
                    } catch(Exception e) {
                        system.debug('Exception Occurred : '+feedItemList);
                    }
                }
            }
        }
    }
   
    private static boolean recursiveCheck = true;
    public static boolean runOnce() {
        if(recursiveCheck){
            recursiveCheck = false;
            return true;
        }else{
            return recursiveCheck;
        }
    }
}