content: import java.io.*;
  import java.math.*;
  import java.security.*;
  import java.text.*;
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.regex.*;
  
  public class Solution {
  
    // Complete the cost function below.
    static int cost(int[] B) {
      int lowP = 0;
      int highP = 0;
  
      for (int i = 1; i < B.length; i++) {
        int l = Math.max(lowP, highP + Math.abs(B[i - 1]  - 1));
        int h = Math.max(lowP + Math.abs(B[i] - 1), highP + Math.abs(B[i] - B[i - 1]));
        lowP = l;
        highP = h;
      }
  
      return Math.max(lowP, highP);
    }
  
    private static final Scanner scanner = new Scanner(System.in);
  
    public static void main(String[] args) throws IOException {
      BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
  
      int t = scanner.nextInt();
      scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
      for (int tItr = 0; tItr < t; tItr++) {
        int n = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
        int[] B = new int[n];
  
        String[] BItems = scanner.nextLine().split(" ");
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
        for (int i = 0; i < n; i++) {
          int BItem = Integer.parseInt(BItems[i]);
          B[i] = BItem;
        }
  
        int result = cost(B);
  
        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();
      }
  
      bufferedWriter.close();
  
      scanner.close();
    }
  }
  