code: def test_flatten_order_copied(self, xp, order):
      a = testing.shaped_arange((4,), xp)
      b = a.flatten(order=order)
      a[:] = 1
      return b
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import _util
label_desc: Use image node_id 5 for calling the TestArrayFlatten obj's underlying member method code with example usage: obj.test_flatten_order_copied(xp, order) and returns: b