public static void main ( String [ ] args ) {
  int t = sc . nextInt ( ) ;
  int [ ] answers = new int [ t ] ;
  for ( int i = 0 ;
  i < t ;
  i ++ ) {
    int n , m , x , y , totalCost = 0 ;
    n = sc . nextInt ( ) ;
    m = sc . nextInt ( ) ;
    x = sc . nextInt ( ) ;
    y = sc . nextInt ( ) ;
    sc . nextLine ( ) ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      String input = sc . nextLine ( ) ;
      for ( int k = 0 , whites = 0 ;
      k <= m ;
      k ++ ) if ( k == m || input . charAt ( k ) == '*' ) {
        if ( ( y / 2.0f ) < x ) totalCost += ( ( whites / 2 ) * y + ( whites % 2 ) * x ) ;
        else totalCost += ( whites * x ) ;
        whites = 0 ;
      }
      else whites ++ ;
    }
    answers [ i ] = totalCost ;
  }
  for ( int answer : answers ) System . out . println ( answer ) ;
}

public static void main ( String [ ] args ) { int t = sc . nextInt ( ) ; int [ ] answers = new int [ t ] ; for ( int i = 0 ; i < t ; i ++ ) { int n , m , x , y , totalCost = 0 ; n = sc . nextInt ( ) ; m = sc . nextInt ( ) ; x = sc . nextInt ( ) ; y = sc . nextInt ( ) ; sc . nextLine ( ) ; for ( int j = 0 ; j < n ; j ++ ) { String input = sc . nextLine ( ) ; for ( int k = 0 , whites = 0 ; k <= m ; k ++ ) if ( k == m || input . charAt ( k ) == ' * ' ) { if ( ( y / 2.0f ) < x ) totalCost += ( ( whites / 2 ) * y + ( whites % 2 ) * x ) ; else totalCost += ( whites * x ) ; whites = 0 ; } else whites ++ ; } answers [ i ] = totalCost ; } for ( int answer : answers ) System . out . println ( answer ) ; }
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