ext/pybind11/tests/test_numpy_dtypes.py - arm/gem5 - Git at Google

 import re
 import pytest
 from pybind11_tests import numpy_dtypes as m

 pytestmark = pytest.requires_numpy

 with pytest.suppress(ImportError):
     import numpy as np


 @pytest.fixture(scope='module')
 def simple_dtype():
     ld = np.dtype('longdouble')
     return np.dtype({'names': ['bool_', 'uint_', 'float_', 'ldbl_'],
                      'formats': ['?', 'u4', 'f4', 'f{}'.format(ld.itemsize)],
                      'offsets': [0, 4, 8, (16 if ld.alignment > 4 else 12)]})


 @pytest.fixture(scope='module')
 def packed_dtype():
     return np.dtype([('bool_', '?'), ('uint_', 'u4'), ('float_', 'f4'), ('ldbl_', 'g')])


 def dt_fmt():
     from sys import byteorder
     e = '<' if byteorder == 'little' else '>'
     return ("{{'names':['bool_','uint_','float_','ldbl_'],"
             " 'formats':['?','" + e + "u4','" + e + "f4','" + e + "f{}'],"
             " 'offsets':[0,4,8,{}], 'itemsize':{}}}")


 def simple_dtype_fmt():
     ld = np.dtype('longdouble')
     simple_ld_off = 12 + 4 * (ld.alignment > 4)
     return dt_fmt().format(ld.itemsize, simple_ld_off, simple_ld_off + ld.itemsize)


 def packed_dtype_fmt():
     from sys import byteorder
     return "[('bool_', '?'), ('uint_', '{e}u4'), ('float_', '{e}f4'), ('ldbl_', '{e}f{}')]".format(
         np.dtype('longdouble').itemsize, e='<' if byteorder == 'little' else '>')


 def partial_ld_offset():
     return 12 + 4 * (np.dtype('uint64').alignment > 4) + 8 + 8 * (
         np.dtype('longdouble').alignment > 8)


 def partial_dtype_fmt():
     ld = np.dtype('longdouble')
     partial_ld_off = partial_ld_offset()
     return dt_fmt().format(ld.itemsize, partial_ld_off, partial_ld_off + ld.itemsize)


 def partial_nested_fmt():
     ld = np.dtype('longdouble')
     partial_nested_off = 8 + 8 * (ld.alignment > 8)
     partial_ld_off = partial_ld_offset()
     partial_nested_size = partial_nested_off * 2 + partial_ld_off + ld.itemsize
     return "{{'names':['a'], 'formats':[{}], 'offsets':[{}], 'itemsize':{}}}".format(
         partial_dtype_fmt(), partial_nested_off, partial_nested_size)


 def assert_equal(actual, expected_data, expected_dtype):
     np.testing.assert_equal(actual, np.array(expected_data, dtype=expected_dtype))


 def test_format_descriptors():
     with pytest.raises(RuntimeError) as excinfo:
         m.get_format_unbound()
     assert re.match('^NumPy type info missing for .*UnboundStruct.*$', str(excinfo.value))

     ld = np.dtype('longdouble')
     ldbl_fmt = ('4x' if ld.alignment > 4 else '') + ld.char
     ss_fmt = "^T{?:bool_:3xI:uint_:f:float_:" + ldbl_fmt + ":ldbl_:}"
     dbl = np.dtype('double')
     partial_fmt = ("^T{?:bool_:3xI:uint_:f:float_:" +
                    str(4 * (dbl.alignment > 4) + dbl.itemsize + 8 * (ld.alignment > 8)) +
                    "xg:ldbl_:}")
     nested_extra = str(max(8, ld.alignment))
     assert m.print_format_descriptors() == [
         ss_fmt,
         "^T{?:bool_:I:uint_:f:float_:g:ldbl_:}",
         "^T{" + ss_fmt + ":a:^T{?:bool_:I:uint_:f:float_:g:ldbl_:}:b:}",
         partial_fmt,
         "^T{" + nested_extra + "x" + partial_fmt + ":a:" + nested_extra + "x}",
         "^T{3s:a:3s:b:}",
         "^T{(3)4s:a:(2)i:b:(3)B:c:1x(4, 2)f:d:}",
         '^T{q:e1:B:e2:}',
         '^T{Zf:cflt:Zd:cdbl:}'
     ]


 def test_dtype(simple_dtype):
     from sys import byteorder
     e = '<' if byteorder == 'little' else '>'

     assert m.print_dtypes() == [
         simple_dtype_fmt(),
         packed_dtype_fmt(),
         "[('a', {}), ('b', {})]".format(simple_dtype_fmt(), packed_dtype_fmt()),
         partial_dtype_fmt(),
         partial_nested_fmt(),
         "[('a', 'S3'), ('b', 'S3')]",
         ("{{'names':['a','b','c','d'], " +
          "'formats':[('S4', (3,)),('<i4', (2,)),('u1', (3,)),('<f4', (4, 2))], " +
          "'offsets':[0,12,20,24], 'itemsize':56}}").format(e=e),
         "[('e1', '" + e + "i8'), ('e2', 'u1')]",
         "[('x', 'i1'), ('y', '" + e + "u8')]",
         "[('cflt', '" + e + "c8'), ('cdbl', '" + e + "c16')]"
     ]

     d1 = np.dtype({'names': ['a', 'b'], 'formats': ['int32', 'float64'],
                    'offsets': [1, 10], 'itemsize': 20})
     d2 = np.dtype([('a', 'i4'), ('b', 'f4')])
     assert m.test_dtype_ctors() == [np.dtype('int32'), np.dtype('float64'),
                                     np.dtype('bool'), d1, d1, np.dtype('uint32'), d2]

     assert m.test_dtype_methods() == [np.dtype('int32'), simple_dtype, False, True,
                                       np.dtype('int32').itemsize, simple_dtype.itemsize]

     assert m.trailing_padding_dtype() == m.buffer_to_dtype(np.zeros(1, m.trailing_padding_dtype()))


 def test_recarray(simple_dtype, packed_dtype):
     elements = [(False, 0, 0.0, -0.0), (True, 1, 1.5, -2.5), (False, 2, 3.0, -5.0)]

     for func, dtype in [(m.create_rec_simple, simple_dtype), (m.create_rec_packed, packed_dtype)]:
         arr = func(0)
         assert arr.dtype == dtype
         assert_equal(arr, [], simple_dtype)
         assert_equal(arr, [], packed_dtype)

         arr = func(3)
         assert arr.dtype == dtype
         assert_equal(arr, elements, simple_dtype)
         assert_equal(arr, elements, packed_dtype)

         if dtype == simple_dtype:
             assert m.print_rec_simple(arr) == [
                 "s:0,0,0,-0",
                 "s:1,1,1.5,-2.5",
                 "s:0,2,3,-5"
             ]
         else:
             assert m.print_rec_packed(arr) == [
                 "p:0,0,0,-0",
                 "p:1,1,1.5,-2.5",
                 "p:0,2,3,-5"
             ]

     nested_dtype = np.dtype([('a', simple_dtype), ('b', packed_dtype)])

     arr = m.create_rec_nested(0)
     assert arr.dtype == nested_dtype
     assert_equal(arr, [], nested_dtype)

     arr = m.create_rec_nested(3)
     assert arr.dtype == nested_dtype
     assert_equal(arr, [((False, 0, 0.0, -0.0), (True, 1, 1.5, -2.5)),
                        ((True, 1, 1.5, -2.5), (False, 2, 3.0, -5.0)),
                        ((False, 2, 3.0, -5.0), (True, 3, 4.5, -7.5))], nested_dtype)
     assert m.print_rec_nested(arr) == [
         "n:a=s:0,0,0,-0;b=p:1,1,1.5,-2.5",
         "n:a=s:1,1,1.5,-2.5;b=p:0,2,3,-5",
         "n:a=s:0,2,3,-5;b=p:1,3,4.5,-7.5"
     ]

     arr = m.create_rec_partial(3)
     assert str(arr.dtype) == partial_dtype_fmt()
     partial_dtype = arr.dtype
     assert '' not in arr.dtype.fields
     assert partial_dtype.itemsize > simple_dtype.itemsize
     assert_equal(arr, elements, simple_dtype)
     assert_equal(arr, elements, packed_dtype)

     arr = m.create_rec_partial_nested(3)
     assert str(arr.dtype) == partial_nested_fmt()
     assert '' not in arr.dtype.fields
     assert '' not in arr.dtype.fields['a'][0].fields
     assert arr.dtype.itemsize > partial_dtype.itemsize
     np.testing.assert_equal(arr['a'], m.create_rec_partial(3))


 def test_array_constructors():
     data = np.arange(1, 7, dtype='int32')
     for i in range(8):
         np.testing.assert_array_equal(m.test_array_ctors(10 + i), data.reshape((3, 2)))
         np.testing.assert_array_equal(m.test_array_ctors(20 + i), data.reshape((3, 2)))
     for i in range(5):
         np.testing.assert_array_equal(m.test_array_ctors(30 + i), data)
         np.testing.assert_array_equal(m.test_array_ctors(40 + i), data)


 def test_string_array():
     arr = m.create_string_array(True)
     assert str(arr.dtype) == "[('a', 'S3'), ('b', 'S3')]"
     assert m.print_string_array(arr) == [
         "a='',b=''",
         "a='a',b='a'",
         "a='ab',b='ab'",
         "a='abc',b='abc'"
     ]
     dtype = arr.dtype
     assert arr['a'].tolist() == [b'', b'a', b'ab', b'abc']
     assert arr['b'].tolist() == [b'', b'a', b'ab', b'abc']
     arr = m.create_string_array(False)
     assert dtype == arr.dtype


 def test_array_array():
     from sys import byteorder
     e = '<' if byteorder == 'little' else '>'

     arr = m.create_array_array(3)
     assert str(arr.dtype) == (
         "{{'names':['a','b','c','d'], " +
         "'formats':[('S4', (3,)),('<i4', (2,)),('u1', (3,)),('{e}f4', (4, 2))], " +
         "'offsets':[0,12,20,24], 'itemsize':56}}").format(e=e)
     assert m.print_array_array(arr) == [
         "a={{A,B,C,D},{K,L,M,N},{U,V,W,X}},b={0,1}," +
         "c={0,1,2},d={{0,1},{10,11},{20,21},{30,31}}",
         "a={{W,X,Y,Z},{G,H,I,J},{Q,R,S,T}},b={1000,1001}," +
         "c={10,11,12},d={{100,101},{110,111},{120,121},{130,131}}",
         "a={{S,T,U,V},{C,D,E,F},{M,N,O,P}},b={2000,2001}," +
         "c={20,21,22},d={{200,201},{210,211},{220,221},{230,231}}",
     ]
     assert arr['a'].tolist() == [[b'ABCD', b'KLMN', b'UVWX'],
                                  [b'WXYZ', b'GHIJ', b'QRST'],
                                  [b'STUV', b'CDEF', b'MNOP']]
     assert arr['b'].tolist() == [[0, 1], [1000, 1001], [2000, 2001]]
     assert m.create_array_array(0).dtype == arr.dtype


 def test_enum_array():
     from sys import byteorder
     e = '<' if byteorder == 'little' else '>'

     arr = m.create_enum_array(3)
     dtype = arr.dtype
     assert dtype == np.dtype([('e1', e + 'i8'), ('e2', 'u1')])
     assert m.print_enum_array(arr) == [
         "e1=A,e2=X",
         "e1=B,e2=Y",
         "e1=A,e2=X"
     ]
     assert arr['e1'].tolist() == [-1, 1, -1]
     assert arr['e2'].tolist() == [1, 2, 1]
     assert m.create_enum_array(0).dtype == dtype


 def test_complex_array():
     from sys import byteorder
     e = '<' if byteorder == 'little' else '>'

     arr = m.create_complex_array(3)
     dtype = arr.dtype
     assert dtype == np.dtype([('cflt', e + 'c8'), ('cdbl', e + 'c16')])
     assert m.print_complex_array(arr) == [
         "c:(0,0.25),(0.5,0.75)",
         "c:(1,1.25),(1.5,1.75)",
         "c:(2,2.25),(2.5,2.75)"
     ]
     assert arr['cflt'].tolist() == [0.0 + 0.25j, 1.0 + 1.25j, 2.0 + 2.25j]
     assert arr['cdbl'].tolist() == [0.5 + 0.75j, 1.5 + 1.75j, 2.5 + 2.75j]
     assert m.create_complex_array(0).dtype == dtype


 def test_signature(doc):
     assert doc(m.create_rec_nested) == \
         "create_rec_nested(arg0: int) -> numpy.ndarray[NestedStruct]"


 def test_scalar_conversion():
     n = 3
     arrays = [m.create_rec_simple(n), m.create_rec_packed(n),
               m.create_rec_nested(n), m.create_enum_array(n)]
     funcs = [m.f_simple, m.f_packed, m.f_nested]

     for i, func in enumerate(funcs):
         for j, arr in enumerate(arrays):
             if i == j and i < 2:
                 assert [func(arr[k]) for k in range(n)] == [k * 10 for k in range(n)]
             else:
                 with pytest.raises(TypeError) as excinfo:
                     func(arr[0])
                 assert 'incompatible function arguments' in str(excinfo.value)


 def test_register_dtype():
     with pytest.raises(RuntimeError) as excinfo:
         m.register_dtype()
     assert 'dtype is already registered' in str(excinfo.value)


 @pytest.requires_numpy
 def test_compare_buffer_info():
     assert all(m.compare_buffer_info())
	import re
	import pytest
	from pybind11_tests import numpy_dtypes as m

	pytestmark = pytest.requires_numpy

	with pytest.suppress(ImportError):
	import numpy as np


	@pytest.fixture(scope='module')
	def simple_dtype():
	ld = np.dtype('longdouble')
	return np.dtype({'names': ['bool_', 'uint_', 'float_', 'ldbl_'],
	'formats': ['?', 'u4', 'f4', 'f{}'.format(ld.itemsize)],
	'offsets': [0, 4, 8, (16 if ld.alignment > 4 else 12)]})


	@pytest.fixture(scope='module')
	def packed_dtype():
	return np.dtype([('bool_', '?'), ('uint_', 'u4'), ('float_', 'f4'), ('ldbl_', 'g')])


	def dt_fmt():
	from sys import byteorder
	e = '<' if byteorder == 'little' else '>'
	return ("{{'names':['bool_','uint_','float_','ldbl_'],"
	" 'formats':['?','" + e + "u4','" + e + "f4','" + e + "f{}'],"
	" 'offsets':[0,4,8,{}], 'itemsize':{}}}")


	def simple_dtype_fmt():
	ld = np.dtype('longdouble')
	simple_ld_off = 12 + 4 * (ld.alignment > 4)
	return dt_fmt().format(ld.itemsize, simple_ld_off, simple_ld_off + ld.itemsize)


	def packed_dtype_fmt():
	from sys import byteorder
	return "[('bool_', '?'), ('uint_', '{e}u4'), ('float_', '{e}f4'), ('ldbl_', '{e}f{}')]".format(
	np.dtype('longdouble').itemsize, e='<' if byteorder == 'little' else '>')


	def partial_ld_offset():
	return 12 + 4 * (np.dtype('uint64').alignment > 4) + 8 + 8 * (
	np.dtype('longdouble').alignment > 8)


	def partial_dtype_fmt():
	ld = np.dtype('longdouble')
	partial_ld_off = partial_ld_offset()
	return dt_fmt().format(ld.itemsize, partial_ld_off, partial_ld_off + ld.itemsize)


	def partial_nested_fmt():
	ld = np.dtype('longdouble')
	partial_nested_off = 8 + 8 * (ld.alignment > 8)
	partial_ld_off = partial_ld_offset()
	partial_nested_size = partial_nested_off * 2 + partial_ld_off + ld.itemsize
	return "{{'names':['a'], 'formats':[{}], 'offsets':[{}], 'itemsize':{}}}".format(
	partial_dtype_fmt(), partial_nested_off, partial_nested_size)


	def assert_equal(actual, expected_data, expected_dtype):
	np.testing.assert_equal(actual, np.array(expected_data, dtype=expected_dtype))


	def test_format_descriptors():
	with pytest.raises(RuntimeError) as excinfo:
	m.get_format_unbound()
	assert re.match('^NumPy type info missing for .UnboundStruct.$', str(excinfo.value))

	ld = np.dtype('longdouble')
	ldbl_fmt = ('4x' if ld.alignment > 4 else '') + ld.char
	ss_fmt = "^T{?:bool_:3xI:uint_:f:float_:" + ldbl_fmt + ":ldbl_:}"
	dbl = np.dtype('double')
	partial_fmt = ("^T{?:bool_:3xI:uint_:f:float_:" +
	str(4 * (dbl.alignment > 4) + dbl.itemsize + 8 * (ld.alignment > 8)) +
	"xg:ldbl_:}")
	nested_extra = str(max(8, ld.alignment))
	assert m.print_format_descriptors() == [
	ss_fmt,
	"^T{?:bool_:I:uint_:f:float_:g:ldbl_:}",
	"^T{" + ss_fmt + ":a:^T{?:bool_:I:uint_:f:float_:g:ldbl_:}:b:}",
	partial_fmt,
	"^T{" + nested_extra + "x" + partial_fmt + ":a:" + nested_extra + "x}",
	"^T{3s:a:3s:b:}",
	"^T{(3)4s:a:(2)i:b:(3)B:c:1x(4, 2)f:d:}",
	'^T{q:e1:B:e2:}',
	'^T{Zf:cflt:Zd:cdbl:}'
	]


	def test_dtype(simple_dtype):
	from sys import byteorder
	e = '<' if byteorder == 'little' else '>'

	assert m.print_dtypes() == [
	simple_dtype_fmt(),
	packed_dtype_fmt(),
	"[('a', {}), ('b', {})]".format(simple_dtype_fmt(), packed_dtype_fmt()),
	partial_dtype_fmt(),
	partial_nested_fmt(),
	"[('a', 'S3'), ('b', 'S3')]",
	("{{'names':['a','b','c','d'], " +
	"'formats':[('S4', (3,)),('<i4', (2,)),('u1', (3,)),('<f4', (4, 2))], " +
	"'offsets':[0,12,20,24], 'itemsize':56}}").format(e=e),
	"[('e1', '" + e + "i8'), ('e2', 'u1')]",
	"[('x', 'i1'), ('y', '" + e + "u8')]",
	"[('cflt', '" + e + "c8'), ('cdbl', '" + e + "c16')]"
	]

	d1 = np.dtype({'names': ['a', 'b'], 'formats': ['int32', 'float64'],
	'offsets': [1, 10], 'itemsize': 20})
	d2 = np.dtype([('a', 'i4'), ('b', 'f4')])
	assert m.test_dtype_ctors() == [np.dtype('int32'), np.dtype('float64'),
	np.dtype('bool'), d1, d1, np.dtype('uint32'), d2]

	assert m.test_dtype_methods() == [np.dtype('int32'), simple_dtype, False, True,
	np.dtype('int32').itemsize, simple_dtype.itemsize]

	assert m.trailing_padding_dtype() == m.buffer_to_dtype(np.zeros(1, m.trailing_padding_dtype()))


	def test_recarray(simple_dtype, packed_dtype):
	elements = [(False, 0, 0.0, -0.0), (True, 1, 1.5, -2.5), (False, 2, 3.0, -5.0)]

	for func, dtype in [(m.create_rec_simple, simple_dtype), (m.create_rec_packed, packed_dtype)]:
	arr = func(0)
	assert arr.dtype == dtype
	assert_equal(arr, [], simple_dtype)
	assert_equal(arr, [], packed_dtype)

	arr = func(3)
	assert arr.dtype == dtype
	assert_equal(arr, elements, simple_dtype)
	assert_equal(arr, elements, packed_dtype)

	if dtype == simple_dtype:
	assert m.print_rec_simple(arr) == [
	"s:0,0,0,-0",
	"s:1,1,1.5,-2.5",
	"s:0,2,3,-5"
	]
	else:
	assert m.print_rec_packed(arr) == [
	"p:0,0,0,-0",
	"p:1,1,1.5,-2.5",
	"p:0,2,3,-5"
	]

	nested_dtype = np.dtype([('a', simple_dtype), ('b', packed_dtype)])

	arr = m.create_rec_nested(0)
	assert arr.dtype == nested_dtype
	assert_equal(arr, [], nested_dtype)

	arr = m.create_rec_nested(3)
	assert arr.dtype == nested_dtype
	assert_equal(arr, [((False, 0, 0.0, -0.0), (True, 1, 1.5, -2.5)),
	((True, 1, 1.5, -2.5), (False, 2, 3.0, -5.0)),
	((False, 2, 3.0, -5.0), (True, 3, 4.5, -7.5))], nested_dtype)
	assert m.print_rec_nested(arr) == [
	"n:a=s:0,0,0,-0;b=p:1,1,1.5,-2.5",
	"n:a=s:1,1,1.5,-2.5;b=p:0,2,3,-5",
	"n:a=s:0,2,3,-5;b=p:1,3,4.5,-7.5"
	]

	arr = m.create_rec_partial(3)
	assert str(arr.dtype) == partial_dtype_fmt()
	partial_dtype = arr.dtype
	assert '' not in arr.dtype.fields
	assert partial_dtype.itemsize > simple_dtype.itemsize
	assert_equal(arr, elements, simple_dtype)
	assert_equal(arr, elements, packed_dtype)

	arr = m.create_rec_partial_nested(3)
	assert str(arr.dtype) == partial_nested_fmt()
	assert '' not in arr.dtype.fields
	assert '' not in arr.dtype.fields['a'][0].fields
	assert arr.dtype.itemsize > partial_dtype.itemsize
	np.testing.assert_equal(arr['a'], m.create_rec_partial(3))


	def test_array_constructors():
	data = np.arange(1, 7, dtype='int32')
	for i in range(8):
	np.testing.assert_array_equal(m.test_array_ctors(10 + i), data.reshape((3, 2)))
	np.testing.assert_array_equal(m.test_array_ctors(20 + i), data.reshape((3, 2)))
	for i in range(5):
	np.testing.assert_array_equal(m.test_array_ctors(30 + i), data)
	np.testing.assert_array_equal(m.test_array_ctors(40 + i), data)


	def test_string_array():
	arr = m.create_string_array(True)
	assert str(arr.dtype) == "[('a', 'S3'), ('b', 'S3')]"
	assert m.print_string_array(arr) == [
	"a='',b=''",
	"a='a',b='a'",
	"a='ab',b='ab'",
	"a='abc',b='abc'"
	]
	dtype = arr.dtype
	assert arr['a'].tolist() == [b'', b'a', b'ab', b'abc']
	assert arr['b'].tolist() == [b'', b'a', b'ab', b'abc']
	arr = m.create_string_array(False)
	assert dtype == arr.dtype


	def test_array_array():
	from sys import byteorder
	e = '<' if byteorder == 'little' else '>'

	arr = m.create_array_array(3)
	assert str(arr.dtype) == (
	"{{'names':['a','b','c','d'], " +
	"'formats':[('S4', (3,)),('<i4', (2,)),('u1', (3,)),('{e}f4', (4, 2))], " +
	"'offsets':[0,12,20,24], 'itemsize':56}}").format(e=e)
	assert m.print_array_array(arr) == [
	"a={{A,B,C,D},{K,L,M,N},{U,V,W,X}},b={0,1}," +
	"c={0,1,2},d={{0,1},{10,11},{20,21},{30,31}}",
	"a={{W,X,Y,Z},{G,H,I,J},{Q,R,S,T}},b={1000,1001}," +
	"c={10,11,12},d={{100,101},{110,111},{120,121},{130,131}}",
	"a={{S,T,U,V},{C,D,E,F},{M,N,O,P}},b={2000,2001}," +
	"c={20,21,22},d={{200,201},{210,211},{220,221},{230,231}}",
	]
	assert arr['a'].tolist() == [[b'ABCD', b'KLMN', b'UVWX'],
	[b'WXYZ', b'GHIJ', b'QRST'],
	[b'STUV', b'CDEF', b'MNOP']]
	assert arr['b'].tolist() == [[0, 1], [1000, 1001], [2000, 2001]]
	assert m.create_array_array(0).dtype == arr.dtype


	def test_enum_array():
	from sys import byteorder
	e = '<' if byteorder == 'little' else '>'

	arr = m.create_enum_array(3)
	dtype = arr.dtype
	assert dtype == np.dtype([('e1', e + 'i8'), ('e2', 'u1')])
	assert m.print_enum_array(arr) == [
	"e1=A,e2=X",
	"e1=B,e2=Y",
	"e1=A,e2=X"
	]
	assert arr['e1'].tolist() == [-1, 1, -1]
	assert arr['e2'].tolist() == [1, 2, 1]
	assert m.create_enum_array(0).dtype == dtype


	def test_complex_array():
	from sys import byteorder
	e = '<' if byteorder == 'little' else '>'

	arr = m.create_complex_array(3)
	dtype = arr.dtype
	assert dtype == np.dtype([('cflt', e + 'c8'), ('cdbl', e + 'c16')])
	assert m.print_complex_array(arr) == [
	"c:(0,0.25),(0.5,0.75)",
	"c:(1,1.25),(1.5,1.75)",
	"c:(2,2.25),(2.5,2.75)"
	]
	assert arr['cflt'].tolist() == [0.0 + 0.25j, 1.0 + 1.25j, 2.0 + 2.25j]
	assert arr['cdbl'].tolist() == [0.5 + 0.75j, 1.5 + 1.75j, 2.5 + 2.75j]
	assert m.create_complex_array(0).dtype == dtype


	def test_signature(doc):
	assert doc(m.create_rec_nested) == \
	"create_rec_nested(arg0: int) -> numpy.ndarray[NestedStruct]"


	def test_scalar_conversion():
	n = 3
	arrays = [m.create_rec_simple(n), m.create_rec_packed(n),
	m.create_rec_nested(n), m.create_enum_array(n)]
	funcs = [m.f_simple, m.f_packed, m.f_nested]

	for i, func in enumerate(funcs):
	for j, arr in enumerate(arrays):
	if i == j and i < 2:
	assert [func(arr[k]) for k in range(n)] == [k * 10 for k in range(n)]
	else:
	with pytest.raises(TypeError) as excinfo:
	func(arr[0])
	assert 'incompatible function arguments' in str(excinfo.value)


	def test_register_dtype():
	with pytest.raises(RuntimeError) as excinfo:
	m.register_dtype()
	assert 'dtype is already registered' in str(excinfo.value)


	@pytest.requires_numpy
	def test_compare_buffer_info():
	assert all(m.compare_buffer_info())