Revert test_rearrange.py's commented out test case

[ghost]

In #133 , we discuss clpy/manipulation/rearrange.py::flip()'s error type.
Current clpy v2.1.0x behave same as CuPy v2.1.0, and raise ValueError.

clpy/clpy/manipulation/rearrange.py

Lines 5 to 30 in 0bdaa05

	def flip(a, axis):
	"""Reverse the order of elements in an array along the given axis.
	Note that ``flip`` function has been introduced since NumPy v1.12.
	The contents of this document is the same as the original one.
	Args:
	a (~clpy.ndarray): Input array.
	axis (int): Axis in array, which entries are reversed.
	Returns:
	~clpy.ndarray: Output array.
	.. seealso:: :func:`numpy.flip`
	"""
	a_ndim = a.ndim
	if a_ndim < 1:
	raise ValueError('Input must be >= 1-d')
	axis = int(axis)
	if not -a_ndim <= axis < a_ndim:
	raise ValueError(
	'axis must be >= %d and < %d' % (-a_ndim, a_ndim))
	return _flip(a, axis)

But it is different from numpy, and test_rearrange.py has some error.
So, we commented out 3 test cases.

clpy/tests/clpy_tests/manipulation_tests/test_rearrange.py

Lines 177 to 197 in 5fc7163

	# TODO(tomoharu.kitawaki): revert these test cases
	# when flip raise core.core._AxisError instead ValueError
	'''
	@testing.for_all_dtypes()
	@testing.numpy_clpy_raises()
	def test_flip_insufficient_ndim(self, xp, dtype):
	x = testing.shaped_arange((), xp, dtype)
	return xp.flip(x, 0)
	@testing.for_all_dtypes()
	@testing.numpy_clpy_raises()
	def test_flip_invalid_axis(self, xp, dtype):
	x = testing.shaped_arange((3, 4), xp, dtype)
	return xp.flip(x, 2)
	@testing.for_all_dtypes()
	@testing.numpy_clpy_raises()
	def test_flip_invalid_negative_axis(self, xp, dtype):
	x = testing.shaped_arange((3, 4), xp, dtype)
	return xp.flip(x, -3)
	'''

These test case must be reverted when clpy get base version update (#33) and merge cupy/cupy@0d28378 in .

[ghost]

In #156 and #173 , we restrict numpy version.
So, this comment out may be unnecessary.

[ghost]

Resolved in #190