/
_impl.py
238 lines (194 loc) · 9.03 KB
/
_impl.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis/
#
# Copyright the Hypothesis Authors.
# Individual contributors are listed in AUTHORS.rst and the git log.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.
import sys
import unittest
from functools import partial
from inspect import Parameter, signature
from typing import TYPE_CHECKING, Optional, Type, Union
from django import forms as df, test as dt
from django.contrib.staticfiles import testing as dst
from django.core.exceptions import ValidationError
from django.db import IntegrityError, models as dm
from hypothesis import reject, strategies as st
from hypothesis.errors import InvalidArgument
from hypothesis.extra.django._fields import from_field
from hypothesis.internal.reflection import define_function_signature
from hypothesis.strategies._internal.utils import defines_strategy
from hypothesis.utils.conventions import infer
if sys.version_info >= (3, 10): # pragma: no cover
from types import EllipsisType as InferType
elif TYPE_CHECKING:
from builtins import ellipsis as InferType
else:
InferType = type(Ellipsis)
class HypothesisTestCase:
def setup_example(self):
self._pre_setup()
def teardown_example(self, example):
self._post_teardown()
def __call__(self, result=None):
testMethod = getattr(self, self._testMethodName)
if getattr(testMethod, "is_hypothesis_test", False):
return unittest.TestCase.__call__(self, result)
else:
return dt.SimpleTestCase.__call__(self, result)
class TestCase(HypothesisTestCase, dt.TestCase):
pass
class TransactionTestCase(HypothesisTestCase, dt.TransactionTestCase):
pass
class LiveServerTestCase(HypothesisTestCase, dt.LiveServerTestCase):
pass
class StaticLiveServerTestCase(HypothesisTestCase, dst.StaticLiveServerTestCase):
pass
@defines_strategy()
def from_model(
*model: Type[dm.Model], **field_strategies: Union[st.SearchStrategy, InferType]
) -> st.SearchStrategy:
"""Return a strategy for examples of ``model``.
.. warning::
Hypothesis creates saved models. This will run inside your testing
transaction when using the test runner, but if you use the dev console
this will leave debris in your database.
``model`` must be an subclass of :class:`~django:django.db.models.Model`.
Strategies for fields may be passed as keyword arguments, for example
``is_staff=st.just(False)``. In order to support models with fields named
"model", this is a positional-only parameter.
Hypothesis can often infer a strategy based the field type and validators,
and will attempt to do so for any required fields. No strategy will be
inferred for an :class:`~django:django.db.models.AutoField`, nullable field,
foreign key, or field for which a keyword
argument is passed to ``from_model()``. For example,
a Shop type with a foreign key to Company could be generated with::
shop_strategy = from_model(Shop, company=from_model(Company))
Like for :func:`~hypothesis.strategies.builds`, you can pass
``...`` (:obj:`python:Ellipsis`) as a keyword argument to infer a strategy for
a field which has a default value instead of using the default.
"""
if len(model) == 1:
m_type = model[0]
elif len(model) > 1:
raise TypeError("Too many positional arguments")
else:
raise TypeError("Missing required positional argument `model`")
if not issubclass(m_type, dm.Model):
raise InvalidArgument(f"model={model!r} must be a subtype of Model")
fields_by_name = {f.name: f for f in m_type._meta.concrete_fields}
for name, value in sorted(field_strategies.items()):
if value is infer:
field_strategies[name] = from_field(fields_by_name[name])
for name, field in sorted(fields_by_name.items()):
if (
name not in field_strategies
and not field.auto_created
and field.default is dm.fields.NOT_PROVIDED
):
field_strategies[name] = from_field(field)
for field in field_strategies:
if m_type._meta.get_field(field).primary_key:
# The primary key is generated as part of the strategy. We
# want to find any existing row with this primary key and
# overwrite its contents.
kwargs = {field: field_strategies.pop(field)}
kwargs["defaults"] = st.fixed_dictionaries(field_strategies) # type: ignore
return _models_impl(st.builds(m_type.objects.update_or_create, **kwargs))
# The primary key is not generated as part of the strategy, so we
# just match against any row that has the same value for all
# fields.
return _models_impl(st.builds(m_type.objects.get_or_create, **field_strategies))
if sys.version_info[:2] >= (3, 8): # pragma: no branch
# See notes above definition of st.builds() - this signature is compatible
# and better matches the semantics of the function. Great for documentation!
sig = signature(from_model)
params = list(sig.parameters.values())
params[0] = params[0].replace(kind=Parameter.POSITIONAL_ONLY)
from_model = define_function_signature(
name=from_model.__name__,
docstring=from_model.__doc__,
signature=sig.replace(parameters=params),
)(from_model)
@st.composite
def _models_impl(draw, strat):
"""Handle the nasty part of drawing a value for models()"""
try:
return draw(strat)[0]
except IntegrityError:
reject()
@defines_strategy()
def from_form(
form: Type[df.Form],
form_kwargs: Optional[dict] = None,
**field_strategies: Union[st.SearchStrategy, InferType],
) -> st.SearchStrategy[df.Form]:
"""Return a strategy for examples of ``form``.
``form`` must be an subclass of :class:`~django:django.forms.Form`.
Strategies for fields may be passed as keyword arguments, for example
``is_staff=st.just(False)``.
Hypothesis can often infer a strategy based the field type and validators,
and will attempt to do so for any required fields. No strategy will be
inferred for a disabled field or field for which a keyword argument
is passed to ``from_form()``.
This function uses the fields of an unbound ``form`` instance to determine
field strategies, any keyword arguments needed to instantiate the unbound
``form`` instance can be passed into ``from_form()`` as a dict with the
keyword ``form_kwargs``. E.g.::
shop_strategy = from_form(Shop, form_kwargs={"company_id": 5})
Like for :func:`~hypothesis.strategies.builds`, you can pass
``...`` (:obj:`python:Ellipsis`) as a keyword argument to infer a strategy for
a field which has a default value instead of using the default.
"""
# currently unsupported:
# ComboField
# FilePathField
# FileField
# ImageField
form_kwargs = form_kwargs or {}
if not issubclass(form, df.BaseForm):
raise InvalidArgument(f"form={form!r} must be a subtype of Form")
# Forms are a little bit different from models. Model classes have
# all their fields defined, whereas forms may have different fields
# per-instance. So, we ought to instantiate the form and get the
# fields from the instance, thus we need to accept the kwargs for
# instantiation as well as the explicitly defined strategies
unbound_form = form(**form_kwargs)
fields_by_name = {}
for name, field in unbound_form.fields.items():
if isinstance(field, df.MultiValueField):
# PS: So this is a little strange, but MultiValueFields must
# have their form data encoded in a particular way for the
# values to actually be picked up by the widget instances'
# ``value_from_datadict``.
# E.g. if a MultiValueField named 'mv_field' has 3
# sub-fields then the ``value_from_datadict`` will look for
# 'mv_field_0', 'mv_field_1', and 'mv_field_2'. Here I'm
# decomposing the individual sub-fields into the names that
# the form validation process expects
for i, _field in enumerate(field.fields):
fields_by_name[f"{name}_{i}"] = _field
else:
fields_by_name[name] = field
for name, value in sorted(field_strategies.items()):
if value is infer:
field_strategies[name] = from_field(fields_by_name[name])
for name, field in sorted(fields_by_name.items()):
if name not in field_strategies and not field.disabled:
field_strategies[name] = from_field(field)
return _forms_impl(
st.builds(
partial(form, **form_kwargs),
data=st.fixed_dictionaries(field_strategies), # type: ignore
)
)
@st.composite
def _forms_impl(draw, strat):
"""Handle the nasty part of drawing a value for from_form()"""
try:
return draw(strat)
except ValidationError:
reject()