public static void main ( String [ ] args ) {
  FastScanner fs = new FastScanner ( ) ;
  int t = fs . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = fs . nextInt ( ) ;
    int a = fs . nextInt ( ) ;
    int b = fs . nextInt ( ) ;
    int h = fs . nextInt ( ) ;
    String ans = fs . next ( ) ;
    int one = 0 ;
    int zero = 0 ;
    for ( char c : ans . toCharArray ( ) ) {
      if ( c == '0' ) zero ++ ;
      else one ++ ;
    }
    int an = 0 ;
    if ( a == b ) an = a * n ;
    else if ( a + h < b ) an = a * zero + ( a + h ) * one ;
    else if ( b + h < a ) an = ( b + h ) * zero + b * one ;
    else an = a * zero + b * one ;
    System . out . println ( an ) ;
  }
}

public static void main ( String [ ] args ) { FastScanner fs = new FastScanner ( ) ; int t = fs . nextInt ( ) ; while ( t -- > 0 ) { int n = fs . nextInt ( ) ; int a = fs . nextInt ( ) ; int b = fs . nextInt ( ) ; int h = fs . nextInt ( ) ; String ans = fs . next ( ) ; int one = 0 ; int zero = 0 ; for ( char c : ans . toCharArray ( ) ) { if ( c == '0' ) zero ++ ; else one ++ ; } int an = 0 ; if ( a == b ) an = a * n ; else if ( a + h < b ) an = a * zero + ( a + h ) * one ; else if ( b + h < a ) an = ( b + h ) * zero + b * one ; else an = a * zero + b * one ; System . out . println ( an ) ; } }
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