How to cover this jdbctemplate.call method in testng

Question

Public testResponse Test(int number){
log.info("started",spalphabets,number);
var output = jdbcTemplate.call(connection -> {
var stmt = connection.prepareCall(spalphabets);
stmt.setInt(1,number);
stmt.setString(2,String.valueOf('apple'));
return stmt;
},getValue());
return Response

How to cover the call method parameters connection.preparecall in the above test response method using testng