for (int[] array : arrays) {
      length += array.length;
    }
    int[] result = new int[checkNoOverflow(length)];
    int pos = 0;
    for (int[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  private static int checkNoOverflow(long result) {
    checkArgument(
        result == (int) result,

  }

  public void testCheckNoOverflow_success() {
    MathPreconditions.checkNoOverflow(true, "testCheckNoOverflow_success", 0, 0);
  }

  public void testCheckNoOverflow_failure() {
    ArithmeticException expected =
        assertThrows(
            ArithmeticException.class,
            () -> MathPreconditions.checkNoOverflow(false, "testCheckNoOverflow_failure", 0, 0));

  }

  public void testCheckNoOverflow_success() {
    MathPreconditions.checkNoOverflow(true, "testCheckNoOverflow_success", 0, 0);
  }

  public void testCheckNoOverflow_failure() {
    ArithmeticException expected =
        assertThrows(
            ArithmeticException.class,
            () -> MathPreconditions.checkNoOverflow(false, "testCheckNoOverflow_failure", 0, 0));

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