public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = sc . nextInt ( ) ;
    int a = sc . nextInt ( ) ;
    int b = sc . nextInt ( ) ;
    int h = sc . nextInt ( ) ;
    String st = sc . next ( ) ;
    int f = 0 ;
    int s = 0 ;
    int ans = 0 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( st . charAt ( i ) == '0' ) f ++ ;
      else s ++ ;
    }
    if ( h + b < a ) {
      ans += h * f + b * f + b * s ;
    }
    else if ( h + a < b ) {
      ans += h * s + a * f + a * s ;
    }
    else ans = a * f + b * s ;
    System . out . println ( ans ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int n = sc . nextInt ( ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int h = sc . nextInt ( ) ; String st = sc . next ( ) ; int f = 0 ; int s = 0 ; int ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( st . charAt ( i ) == '0' ) f ++ ; else s ++ ; } if ( h + b < a ) { ans += h * f + b * f + b * s ; } else if ( h + a < b ) { ans += h * s + a * f + a * s ; } else ans = a * f + b * s ; System . out . println ( ans ) ; } }
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