129 lines
3.8 KiB
Python
129 lines
3.8 KiB
Python
"""
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Common helper functions for tests.
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"""
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from __future__ import absolute_import, division, print_function
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import keyword
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import string
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from hypothesis import strategies as st
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import attr
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from attr import Attribute
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from attr._make import NOTHING, make_class
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def simple_class(cmp=False, repr=False, hash=False, slots=False):
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"""
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Return a new simple class.
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"""
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return make_class(
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"C", ["a", "b"],
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cmp=cmp, repr=repr, hash=hash, init=True, slots=slots
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)
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def simple_attr(name, default=NOTHING, validator=None, repr=True,
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cmp=True, hash=True, init=True):
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"""
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Return an attribute with a name and no other bells and whistles.
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"""
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return Attribute(
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name=name, default=default, validator=validator, repr=repr,
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cmp=cmp, hash=hash, init=init
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)
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class TestSimpleClass(object):
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"""
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Tests for the testing helper function `make_class`.
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"""
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def test_returns_class(self):
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"""
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Returns a class object.
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"""
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assert type is simple_class().__class__
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def returns_distinct_classes(self):
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"""
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Each call returns a completely new class.
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"""
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assert simple_class() is not simple_class()
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def _gen_attr_names():
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"""
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Generate names for attributes, 'a'...'z', then 'aa'...'zz'.
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~702 different attribute names should be enough in practice.
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Some short strings (such as 'as') are keywords, so we skip them.
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"""
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lc = string.ascii_lowercase
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for c in lc:
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yield c
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for outer in lc:
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for inner in lc:
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res = outer + inner
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if keyword.iskeyword(res):
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continue
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yield outer + inner
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def _create_hyp_class(attrs):
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"""
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A helper function for Hypothesis to generate attrs classes.
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"""
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return make_class('HypClass', dict(zip(_gen_attr_names(), attrs)))
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def _create_hyp_nested_strategy(simple_class_strategy):
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"""
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Create a recursive attrs class.
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Given a strategy for building (simpler) classes, create and return
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a strategy for building classes that have the simpler class as an
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attribute.
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"""
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# Use a tuple strategy to combine simple attributes and an attr class.
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def just_class(tup):
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combined_attrs = list(tup[0])
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combined_attrs.append(attr.ib(default=attr.Factory(tup[1])))
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return _create_hyp_class(combined_attrs)
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def list_of_class(tup):
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default = attr.Factory(lambda: [tup[1]()])
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combined_attrs = list(tup[0])
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combined_attrs.append(attr.ib(default=default))
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return _create_hyp_class(combined_attrs)
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def dict_of_class(tup):
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default = attr.Factory(lambda: {"cls": tup[1]()})
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combined_attrs = list(tup[0])
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combined_attrs.append(attr.ib(default=default))
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return _create_hyp_class(combined_attrs)
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return st.one_of(st.tuples(st.lists(simple_attrs), simple_class_strategy)
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.map(just_class),
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st.tuples(st.lists(simple_attrs), simple_class_strategy)
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.map(list_of_class))
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bare_attrs = st.just(attr.ib(default=None))
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int_attrs = st.integers().map(lambda i: attr.ib(default=i))
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str_attrs = st.text().map(lambda s: attr.ib(default=s))
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float_attrs = st.floats().map(lambda f: attr.ib(default=f))
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dict_attrs = (st.dictionaries(keys=st.text(), values=st.integers())
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.map(lambda d: attr.ib(default=d)))
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simple_attrs = st.one_of(bare_attrs, int_attrs, str_attrs, float_attrs,
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dict_attrs)
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simple_classes = st.lists(simple_attrs).map(_create_hyp_class)
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# Ok, so st.recursive works by taking a base strategy (in this case,
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# simple_classes) and a special function. This function receives a strategy,
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# and returns another strategy (building on top of the base strategy).
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nested_classes = st.recursive(simple_classes, _create_hyp_nested_strategy)
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