I'm trying to write a unit test code for the below method but despite using @TestVisible annotation also I'm not able to access the local variables inside my test class. Is there anything I'm missing.    

    public void inactiveUsers(){
    
           // List<String> excludedUserList = getExcludedUsers();
    
            List<user> UserList = new List<user>();       
    
             List<Messaging.SingleEmailMessage> emailsList = new List<Messaging.SingleEmailMessage>();
    
           @TestVisible DateTime dateBefore_90days = Date.today().addDays(Integer.valueof(Label.Secure_provisioning_90_days_notification.trim())*-1);
    
             @TestVisible string d = dateBefore_90days.format('yyyy-MM-dd');
    
            system.debug(Integer.valueof(Label.Secure_provisioning_90_days_notification.trim())*-1+'###'+d);
    
            string query = 'SELECT Id,email,username,lastlogindate FROM User WHERE IsActive = TRUE and DAY_ONLY(convertTimezone(LastLoginDate)) <= '+ d;
    
            system.debug('###query##'+query);
    
            selectedUsers = Database.query(query);
    
            system.debug('Secure_provisioning_90days_notification list### '+selectedUsers);
    
            
    
            for(User record: selectedUsers) {
    
                record.IsActive = false;
    
                UserList.add(record);
    
                
    
                Messaging.Singleemailmessage email = new Messaging.Singleemailmessage();
    
                //  email.setSenderDisplayName('Optum Inactive User Notification');
    
                email.setToAddresses(new String[]{record.email});
    
                email.setCCAddresses( new String[]{Label.Secure_provisioning_cc_email_address});
    
                email.setTargetObjectId(record.id);
    
                email.setSaveAsActivity(false);
    
                String body = getHTMLBody90days(record);
    
                email.setHtmlBody(body);
    
                email.setSubject('Your Access to the CONTRACTHub SEARCHCenter has been revoked');
    
                email.setUseSignature(false);
    
                emailsList.add(email);
    
            }


here is my test code.

    static testMethod void myTest() {
            DeactivateInactiveUsers.dateBefore_90days = Date.today(); // getting error: Variable does not exist: dateBefore_90days
            DeactivateInactiveUsers.d = 'some value';  
    
    }

Any help would be appreciated.