forked from soft-matter/slicerator
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tests.py
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tests.py
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from __future__ import (absolute_import, division, print_function,
unicode_literals)
import os
import numpy as np
import random
import types
import nose
from six import BytesIO
import pickle
from nose.tools import assert_true, assert_false, assert_equal, assert_raises
from slicerator import Slicerator, pipeline, index_attr, propagate_attr
path, _ = os.path.split(os.path.abspath(__file__))
path = os.path.join(path, 'data')
def assert_letters_equal(actual, expected):
# check if both lengths are equal
assert_equal(len(actual), len(expected))
for actual_, expected_ in zip(actual, expected):
assert_equal(actual_, expected_)
def compare_slice_to_list(actual, expected):
assert_letters_equal(actual, expected)
indices = list(range(len(actual)))
for i in indices:
# test positive indexing
assert_letters_equal(actual[i], expected[i])
# test negative indexing
assert_letters_equal(actual[-i + 1], expected[-i + 1])
# in reverse order
for i in indices[::-1]:
assert_letters_equal(actual[i], expected[i])
assert_letters_equal(actual[-i + 1], expected[-i + 1])
# in shuffled order (using a consistent random seed)
r = random.Random(5)
r.shuffle(indices)
for i in indices:
assert_letters_equal(actual[i], expected[i])
assert_letters_equal(actual[-i + 1], expected[-i + 1])
# test list indexing
some_indices = [r.choice(indices) for _ in range(2)]
assert_letters_equal([actual[i] for i in some_indices],
[expected[i] for i in some_indices])
# mixing positive and negative indices
some_indices = [r.choice(indices + [-i-1 for i in indices])
for _ in range(2)]
assert_letters_equal([actual[i] for i in some_indices],
[expected[i] for i in some_indices])
# test slices
assert_letters_equal(actual[::2], expected[::2])
assert_letters_equal(actual[1::2], expected[1::2])
assert_letters_equal(actual[::3], expected[::3])
assert_letters_equal(actual[1:], expected[1:])
assert_letters_equal(actual[:], expected[:])
assert_letters_equal(actual[:-1], expected[:-1])
v = Slicerator(list('abcdefghij'))
def test_bool_mask():
mask = np.array([True, False] * 5)
s = v[mask]
assert_letters_equal(s, list('acegi'))
def test_slice_of_slice():
slice1 = v[4:]
compare_slice_to_list(slice1, list('efghij'))
slice2 = slice1[-3:]
compare_slice_to_list(slice2, list('hij'))
slice1a = v[[3, 4, 5, 6, 7, 8, 9]]
compare_slice_to_list(slice1a, list('defghij'))
slice2a = slice1a[::2]
compare_slice_to_list(slice2a, list('dfhj'))
slice2b = slice1a[::-1]
compare_slice_to_list(slice2b, list('jihgfed'))
slice2c = slice1a[::-2]
compare_slice_to_list(slice2c, list('jhfd'))
slice2d = slice1a[:0:-1]
compare_slice_to_list(slice2d, list('jihgfe'))
slice2e = slice1a[-1:1:-1]
compare_slice_to_list(slice2e, list('jihgf'))
slice2f = slice1a[-2:1:-1]
compare_slice_to_list(slice2f, list('ihgf'))
slice2g = slice1a[::-3]
compare_slice_to_list(slice2g, list('jgd'))
slice2h = slice1a[[5, 6, 2, -1, 3, 3, 3, 0]]
compare_slice_to_list(slice2h, list('ijfjgggd'))
def test_slice_of_slice_of_slice():
slice1 = v[4:]
compare_slice_to_list(slice1, list('efghij'))
slice2 = slice1[1:-1]
compare_slice_to_list(slice2, list('fghi'))
slice2a = slice1[[2, 3, 4]]
compare_slice_to_list(slice2a, list('ghi'))
slice3 = slice2[1::2]
compare_slice_to_list(slice3, list('gi'))
def test_slice_of_slice_of_slice_of_slice():
# Take the red pill. It's slices all the way down!
slice1 = v[4:]
compare_slice_to_list(slice1, list('efghij'))
slice2 = slice1[1:-1]
compare_slice_to_list(slice2, list('fghi'))
slice3 = slice2[1:]
compare_slice_to_list(slice3, list('ghi'))
slice4 = slice3[1:]
compare_slice_to_list(slice4, list('hi'))
# Give me another!
slice1 = v[2:]
compare_slice_to_list(slice1, list('cdefghij'))
slice2 = slice1[0::2]
compare_slice_to_list(slice2, list('cegi'))
slice3 = slice2[:]
compare_slice_to_list(slice3, list('cegi'))
print('define slice4')
slice4 = slice3[:-1]
print('compare slice4')
compare_slice_to_list(slice4, list('ceg'))
print('define slice4a')
slice4a = slice3[::-1]
print('compare slice4a')
compare_slice_to_list(slice4a, list('igec'))
def test_slice_with_generator():
slice1 = v[1:]
compare_slice_to_list(slice1, list('bcdefghij'))
slice2 = slice1[(i for i in range(2, 5))]
assert_letters_equal(list(slice2), list('def'))
assert_true(isinstance(slice2, types.GeneratorType))
def test_no_len_raises():
with assert_raises(ValueError):
Slicerator((i for i in range(5)), (i for i in range(5)))
def test_from_func():
v = Slicerator.from_func(lambda x: 'abcdefghij'[x], length=10)
compare_slice_to_list(v, list('abcdefghij'))
compare_slice_to_list(v[1:], list('bcdefghij'))
compare_slice_to_list(v[1:][:4], list('bcde'))
def _capitalize(letter):
return letter.upper()
def _capitalize_if_equal(letter, other_letter):
if letter == other_letter:
return letter.upper()
else:
return letter
def _a_to_z(letter):
if letter == 'a':
return 'z'
else:
return letter
def test_pipeline_simple():
capitalize = pipeline(_capitalize)
cap_v = capitalize(v[:1])
assert_letters_equal([cap_v[0]], [_capitalize(v[0])])
def test_pipeline_propagation():
capitalize = pipeline(_capitalize)
cap_v = capitalize(v)
assert_letters_equal([cap_v[:1][0]], ['A'])
assert_letters_equal([cap_v[:1][:2][0]], ['A'])
def test_pipeline_nesting():
capitalize = pipeline(_capitalize)
a_to_z = pipeline(_a_to_z)
nested_v = capitalize(a_to_z(v))
assert_letters_equal([nested_v[0]], ['Z'])
assert_letters_equal([nested_v[:1][0]], ['Z'])
def test_repr():
repr(v)
def test_getattr():
class MyList(list):
attr1 = 'hello'
attr2 = 'hello again'
@index_attr
def s(self, i):
return list('ABCDEFGHIJ')[i]
def close(self):
pass
a = Slicerator(MyList('abcdefghij'), propagate_attrs=['attr1', 's'])
assert_letters_equal(a, list('abcdefghij'))
assert_true(hasattr(a, 'attr1'))
assert_false(hasattr(a, 'attr2'))
assert_true(hasattr(a, 's'))
assert_false(hasattr(a, 'close'))
assert_equal(a.attr1, 'hello')
with assert_raises(AttributeError):
a[:5].nonexistent_attr
compare_slice_to_list(list(a[::2].s), list('ACEGI'))
compare_slice_to_list(list(a[::2][1:].s), list('CEGI'))
def test_getattr_subclass():
@Slicerator.from_class
class Dummy(object):
propagate_attrs = ['attr1']
def __init__(self):
self.frame = list('abcdefghij')
def __len__(self):
return len(self.frame)
def __getitem__(self, i):
return self.frame[i]
def attr1(self):
# propagates through slices of Dummy
return 'sliced'
@propagate_attr
def attr2(self):
# propagates through slices of Dummy and subclasses
return 'also in subclasses'
def attr3(self):
# does not propagate
return 'only unsliced'
class SubClass(Dummy):
propagate_attrs = ['attr4'] # overwrites propagated attrs from Dummy
def __len__(self):
return len(self.frame)
@property
def attr4(self):
# propagates through slices of SubClass
return 'only subclass'
dummy = Dummy()
subclass = SubClass()
assert_true(hasattr(dummy, 'attr1'))
assert_true(hasattr(dummy, 'attr2'))
assert_true(hasattr(dummy, 'attr3'))
assert_false(hasattr(dummy, 'attr4'))
assert_true(hasattr(dummy[1:], 'attr1'))
assert_true(hasattr(dummy[1:], 'attr2'))
assert_false(hasattr(dummy[1:], 'attr3'))
assert_false(hasattr(dummy[1:], 'attr4'))
assert_true(hasattr(dummy[1:][1:], 'attr1'))
assert_true(hasattr(dummy[1:][1:], 'attr2'))
assert_false(hasattr(dummy[1:][1:], 'attr3'))
assert_false(hasattr(dummy[1:][1:], 'attr4'))
assert_true(hasattr(subclass, 'attr1'))
assert_true(hasattr(subclass, 'attr2'))
assert_true(hasattr(subclass, 'attr3'))
assert_true(hasattr(subclass, 'attr4'))
assert_false(hasattr(subclass[1:], 'attr1'))
assert_true(hasattr(subclass[1:], 'attr2'))
assert_false(hasattr(subclass[1:], 'attr3'))
assert_true(hasattr(subclass[1:], 'attr4'))
assert_false(hasattr(subclass[1:][1:], 'attr1'))
assert_true(hasattr(subclass[1:][1:], 'attr2'))
assert_false(hasattr(subclass[1:][1:], 'attr3'))
assert_true(hasattr(subclass[1:][1:], 'attr4'))
def test_pipeline_with_args():
capitalize = pipeline(_capitalize_if_equal)
cap_a = capitalize(v, 'a')
cap_b = capitalize(v, 'b')
assert_letters_equal(cap_a, 'Abcdefghij')
assert_letters_equal(cap_b, 'aBcdefghij')
assert_letters_equal([cap_a[0]], ['A'])
assert_letters_equal([cap_b[0]], ['a'])
assert_letters_equal([cap_a[0]], ['A'])
def test_composed_pipelines():
a_to_z = pipeline(_a_to_z)
capitalize = pipeline(_capitalize_if_equal)
composed = capitalize(a_to_z(v), 'c')
assert_letters_equal(composed, 'zbCdefghij')
def test_serialize():
# dump Slicerator
stream = BytesIO()
pickle.dump(v, stream)
stream.seek(0)
v2 = pickle.load(stream)
stream.close()
compare_slice_to_list(v2, list('abcdefghij'))
compare_slice_to_list(v2[4:], list('efghij'))
compare_slice_to_list(v2[4:][:-1], list('efghi'))
# dump sliced Slicerator
stream = BytesIO()
pickle.dump(v[4:], stream)
stream.seek(0)
v2 = pickle.load(stream)
stream.close()
compare_slice_to_list(v2, list('efghij'))
compare_slice_to_list(v2[2:], list('ghij'))
compare_slice_to_list(v2[2:][:-1], list('ghi'))
# dump sliced sliced Slicerator
stream = BytesIO()
pickle.dump(v[4:][:-1], stream)
stream.seek(0)
v2 = pickle.load(stream)
stream.close()
compare_slice_to_list(v2, list('efghi'))
compare_slice_to_list(v2[2:], list('ghi'))
compare_slice_to_list(v2[2:][:-1], list('gh'))
# test pipeline
capitalize = pipeline(_capitalize_if_equal)
stream = BytesIO()
pickle.dump(capitalize(v, 'a'), stream)
stream.seek(0)
v2 = pickle.load(stream)
stream.close()
compare_slice_to_list(v2, list('Abcdefghij'))
def test_from_class():
class Dummy(object):
"""DocString"""
def __init__(self):
self.frame = list('abcdefghij')
def __len__(self):
return len(self.frame)
def __getitem__(self, i):
"""Other Docstring"""
return self.frame[i] # actual code of get_frame
def __repr__(self):
return 'Repr'
DummySli = Slicerator.from_class(Dummy)
assert Dummy()[:2] == ['a', 'b'] # Dummy is unaffected
# class slots propagate
assert DummySli.__name__ == Dummy.__name__
assert DummySli.__doc__ == Dummy.__doc__
assert DummySli.__module__ == Dummy.__module__
dummy = DummySli()
assert isinstance(dummy, Dummy) # still instance of Dummy
assert repr(dummy) == 'Repr' # repr propagates
compare_slice_to_list(dummy, 'abcdefghij')
compare_slice_to_list(dummy[1:], 'bcdefghij')
compare_slice_to_list(dummy[1:][2:], 'defghij')
capitalize = pipeline(_capitalize_if_equal)
cap_b = capitalize(dummy, 'b')
assert_letters_equal(cap_b, 'aBcdefghij')
def test_lazy_hasattr():
# this ensures that the Slicerator init does not evaluate all properties
class Dummy(object):
"""DocString"""
def __init__(self):
self.frame = list('abcdefghij')
def __len__(self):
return len(self.frame)
def __getitem__(self, i):
"""Other Docstring"""
return self.frame[i] # actual code of get_frame
@property
def forbidden_property(self):
raise RuntimeError()
DummySli = Slicerator.from_class(Dummy)
if __name__ == '__main__':
nose.runmodule(argv=[__file__, '-vvs', '-x', '--pdb', '--pdb-failure'],
exit=False)