How to change Detail page button functionality based on Profiles?

when I run the test class I was getting this error::System.JSONException: Unexpected character ('s' (code 115)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') at input location [1,2]

public  static String save(string data)
 InnerWrapper req =(InnerWrapper)JSON.deserialize(data,InnerWrapper.class);

Inner class
=======
public class InnerWrapper{
        List<String> ls;
        List<String> types;
        String parentId;
        Boolean ismpty;
        Boolean pSave;
        Map<String,Rule__c> type;
        String no;
    }

I am getting Error:System.QueryException: List has no rows for assignment to SObject
public String save(String ids){
            Case caseObject = [SELECT Subject, Description, ContactId, Origin, Priority, Status, OwnerId, RecordTypeId, ParentId,  Product_Code__c,Product_Description__c, Lot_Number__c, GMP_Quality__c, Trademark__c, Business_Unit__c,  ProdCert_Topic__c,Rega_Responsibility__c,ProdCert_Request__c,Business_Line_Description__c,Additional_Request_Info__c,Applied_ProdCert_Rule__c,RAAnswer__c FROM Case where Id =: ids];
 

when I run the test class I was getting this error::System.JSONException: Unexpected character ('s' (code 115)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') at input location [1,2]

public  static String save(string data)
 InnerWrapper req =(InnerWrapper)JSON.deserialize(data,InnerWrapper.class);

Inner class
=======
public class InnerWrapper{
        List<String> ls;
        List<String> types;
        String parentId;
        Boolean ismpty;
        Boolean pSave;
        Map<String,Rule__c> type;
        String no;
    }

I am getting Error:System.QueryException: List has no rows for assignment to SObject
public String save(String ids){
            Case caseObject = [SELECT Subject, Description, ContactId, Origin, Priority, Status, OwnerId, RecordTypeId, ParentId,  Product_Code__c,Product_Description__c, Lot_Number__c, GMP_Quality__c, Trademark__c, Business_Unit__c,  ProdCert_Topic__c,Rega_Responsibility__c,ProdCert_Request__c,Business_Line_Description__c,Additional_Request_Info__c,Applied_ProdCert_Rule__c,RAAnswer__c FROM Case where Id =: ids];