public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int T = in . nextInt ( ) ;
  for ( int t = 0 ;
  t < T ;
  t ++ ) {
    in . nextInt ( ) ;
    int C0 = in . nextInt ( ) ;
    int C1 = in . nextInt ( ) ;
    int H = in . nextInt ( ) ;
    int zeros = 0 ;
    int ones = 0 ;
    String S = in . next ( ) ;
    for ( char c : S . toCharArray ( ) ) {
      if ( c == '0' ) {
        zeros ++ ;
      }
      else {
        ones ++ ;
      }
    }
    int cost = 0 ;
    if ( C0 > C1 + H ) {
      cost += H * zeros ;
      ones += zeros ;
      zeros = 0 ;
    }
    if ( C1 > C0 + H ) {
      cost += H * ones ;
      zeros += ones ;
      ones = 0 ;
    }
    cost += C0 * zeros + C1 * ones ;
    System . out . println ( cost ) ;
  }
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int T = in . nextInt ( ) ; for ( int t = 0 ; t < T ; t ++ ) { in . nextInt ( ) ; int C0 = in . nextInt ( ) ; int C1 = in . nextInt ( ) ; int H = in . nextInt ( ) ; int zeros = 0 ; int ones = 0 ; String S = in . next ( ) ; for ( char c : S . toCharArray ( ) ) { if ( c == '0' ) { zeros ++ ; } else { ones ++ ; } } int cost = 0 ; if ( C0 > C1 + H ) { cost += H * zeros ; ones += zeros ; zeros = 0 ; } if ( C1 > C0 + H ) { cost += H * ones ; zeros += ones ; ones = 0 ; } cost += C0 * zeros + C1 * ones ; System . out . println ( cost ) ; } }
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