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"""Make sure that arguments of open/read/write don't diverge."""
import pytest
import soundfile as sf
import sys
pytestmark = pytest.mark.skipif(sys.version_info < (3, 3),
reason="signature module requires Python 3.3")
def defaults(func):
from inspect import signature
return dict((k, v) for k, v in signature(func).parameters.items()
if v.default is not v.empty)
def remove_items(collection, subset):
"""From a collection of defaults, remove a subset and return the rest."""
the_rest = collection.copy()
for name, param in subset.items():
assert (name, the_rest[name].default) == (name, param.default)
del the_rest[name]
return the_rest
def test_read_defaults():
func_defaults = defaults(sf.read)
meth_defaults = defaults(sf.SoundFile.read)
init_defaults = defaults(sf.SoundFile.__init__)
del init_defaults['mode'] # mode is always 'r'
del func_defaults['start']
del func_defaults['stop']
# Same default values as SoundFile.__init__() and SoundFile.read():
for spec in init_defaults, meth_defaults:
func_defaults = remove_items(func_defaults, spec)
assert not func_defaults # No more arguments should be left
def test_write_defaults():
write_defaults = defaults(sf.write)
init_defaults = defaults(sf.SoundFile.__init__)
# Same default values as SoundFile.__init__()
init_defaults = remove_items(init_defaults, write_defaults)
del init_defaults['mode'] # mode is always 'x' or 'w'
del init_defaults['channels'] # Inferred from data
del init_defaults['samplerate'] # Obligatory in write()
assert not init_defaults # No more arguments should be left
def test_if_blocks_function_and_method_have_same_defaults():
func_defaults = defaults(sf.blocks)
meth_defaults = defaults(sf.SoundFile.blocks)
init_defaults = defaults(sf.SoundFile.__init__)
del func_defaults['start']
del func_defaults['stop']
del init_defaults['mode']
for spec in init_defaults, meth_defaults:
func_defaults = remove_items(func_defaults, spec)
assert not func_defaults
def test_order_of_blocks_arguments():
from inspect import signature
# remove 'self':
meth_args = list(signature(sf.SoundFile.blocks).parameters)[1:]
meth_args[3:3] = ['start', 'stop']
func_args = list(signature(sf.blocks).parameters)
assert func_args[:10] == ['file'] + meth_args
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