491 lines
18 KiB
Python
491 lines
18 KiB
Python
"""
|
|
tl;dr: all code code is licensed under simplified BSD, unless stated otherwise.
|
|
|
|
Unless stated otherwise in the source files, all code is copyright 2010 David
|
|
Wolever <david@wolever.net>. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
1. Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
2. Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
EVENT SHALL <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
|
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
The views and conclusions contained in the software and documentation are those
|
|
of the authors and should not be interpreted as representing official policies,
|
|
either expressed or implied, of David Wolever.
|
|
|
|
"""
|
|
import re
|
|
import sys
|
|
import inspect
|
|
import warnings
|
|
from functools import wraps
|
|
from types import MethodType as MethodType
|
|
from collections import namedtuple
|
|
|
|
try:
|
|
from collections import OrderedDict as MaybeOrderedDict
|
|
except ImportError:
|
|
MaybeOrderedDict = dict
|
|
|
|
from unittest import TestCase
|
|
|
|
PY3 = sys.version_info[0] == 3
|
|
PY2 = sys.version_info[0] == 2
|
|
|
|
|
|
if PY3:
|
|
# Python 3 doesn't have an InstanceType, so just use a dummy type.
|
|
class InstanceType():
|
|
pass
|
|
lzip = lambda *a: list(zip(*a))
|
|
text_type = str
|
|
string_types = str,
|
|
bytes_type = bytes
|
|
def make_method(func, instance, type):
|
|
if instance is None:
|
|
return func
|
|
return MethodType(func, instance)
|
|
else:
|
|
from types import InstanceType
|
|
lzip = zip
|
|
text_type = unicode
|
|
bytes_type = str
|
|
string_types = basestring,
|
|
def make_method(func, instance, type):
|
|
return MethodType(func, instance, type)
|
|
|
|
_param = namedtuple("param", "args kwargs")
|
|
|
|
class param(_param):
|
|
""" Represents a single parameter to a test case.
|
|
|
|
For example::
|
|
|
|
>>> p = param("foo", bar=16)
|
|
>>> p
|
|
param("foo", bar=16)
|
|
>>> p.args
|
|
('foo', )
|
|
>>> p.kwargs
|
|
{'bar': 16}
|
|
|
|
Intended to be used as an argument to ``@parameterized``::
|
|
|
|
@parameterized([
|
|
param("foo", bar=16),
|
|
])
|
|
def test_stuff(foo, bar=16):
|
|
pass
|
|
"""
|
|
|
|
def __new__(cls, *args , **kwargs):
|
|
return _param.__new__(cls, args, kwargs)
|
|
|
|
@classmethod
|
|
def explicit(cls, args=None, kwargs=None):
|
|
""" Creates a ``param`` by explicitly specifying ``args`` and
|
|
``kwargs``::
|
|
|
|
>>> param.explicit([1,2,3])
|
|
param(*(1, 2, 3))
|
|
>>> param.explicit(kwargs={"foo": 42})
|
|
param(*(), **{"foo": "42"})
|
|
"""
|
|
args = args or ()
|
|
kwargs = kwargs or {}
|
|
return cls(*args, **kwargs)
|
|
|
|
@classmethod
|
|
def from_decorator(cls, args):
|
|
""" Returns an instance of ``param()`` for ``@parameterized`` argument
|
|
``args``::
|
|
|
|
>>> param.from_decorator((42, ))
|
|
param(args=(42, ), kwargs={})
|
|
>>> param.from_decorator("foo")
|
|
param(args=("foo", ), kwargs={})
|
|
"""
|
|
if isinstance(args, param):
|
|
return args
|
|
elif isinstance(args, string_types):
|
|
args = (args, )
|
|
try:
|
|
return cls(*args)
|
|
except TypeError as e:
|
|
if "after * must be" not in str(e):
|
|
raise
|
|
raise TypeError(
|
|
"Parameters must be tuples, but %r is not (hint: use '(%r, )')"
|
|
%(args, args),
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "param(*%r, **%r)" %self
|
|
|
|
|
|
class QuietOrderedDict(MaybeOrderedDict):
|
|
""" When OrderedDict is available, use it to make sure that the kwargs in
|
|
doc strings are consistently ordered. """
|
|
__str__ = dict.__str__
|
|
__repr__ = dict.__repr__
|
|
|
|
|
|
def parameterized_argument_value_pairs(func, p):
|
|
"""Return tuples of parameterized arguments and their values.
|
|
|
|
This is useful if you are writing your own doc_func
|
|
function and need to know the values for each parameter name::
|
|
|
|
>>> def func(a, foo=None, bar=42, **kwargs): pass
|
|
>>> p = param(1, foo=7, extra=99)
|
|
>>> parameterized_argument_value_pairs(func, p)
|
|
[("a", 1), ("foo", 7), ("bar", 42), ("**kwargs", {"extra": 99})]
|
|
|
|
If the function's first argument is named ``self`` then it will be
|
|
ignored::
|
|
|
|
>>> def func(self, a): pass
|
|
>>> p = param(1)
|
|
>>> parameterized_argument_value_pairs(func, p)
|
|
[("a", 1)]
|
|
|
|
Additionally, empty ``*args`` or ``**kwargs`` will be ignored::
|
|
|
|
>>> def func(foo, *args): pass
|
|
>>> p = param(1)
|
|
>>> parameterized_argument_value_pairs(func, p)
|
|
[("foo", 1)]
|
|
>>> p = param(1, 16)
|
|
>>> parameterized_argument_value_pairs(func, p)
|
|
[("foo", 1), ("*args", (16, ))]
|
|
"""
|
|
argspec = inspect.getargspec(func)
|
|
arg_offset = 1 if argspec.args[:1] == ["self"] else 0
|
|
|
|
named_args = argspec.args[arg_offset:]
|
|
|
|
result = lzip(named_args, p.args)
|
|
named_args = argspec.args[len(result) + arg_offset:]
|
|
varargs = p.args[len(result):]
|
|
|
|
result.extend([
|
|
(name, p.kwargs.get(name, default))
|
|
for (name, default)
|
|
in zip(named_args, argspec.defaults or [])
|
|
])
|
|
|
|
seen_arg_names = {n for (n, _) in result}
|
|
keywords = QuietOrderedDict(sorted([
|
|
(name, p.kwargs[name])
|
|
for name in p.kwargs
|
|
if name not in seen_arg_names
|
|
]))
|
|
|
|
if varargs:
|
|
result.append(("*%s" %(argspec.varargs, ), tuple(varargs)))
|
|
|
|
if keywords:
|
|
result.append(("**%s" %(argspec.keywords, ), keywords))
|
|
|
|
return result
|
|
|
|
def short_repr(x, n=64):
|
|
""" A shortened repr of ``x`` which is guaranteed to be ``unicode``::
|
|
|
|
>>> short_repr("foo")
|
|
u"foo"
|
|
>>> short_repr("123456789", n=4)
|
|
u"12...89"
|
|
"""
|
|
|
|
x_repr = repr(x)
|
|
if isinstance(x_repr, bytes_type):
|
|
try:
|
|
x_repr = text_type(x_repr, "utf-8")
|
|
except UnicodeDecodeError:
|
|
x_repr = text_type(x_repr, "latin1")
|
|
if len(x_repr) > n:
|
|
x_repr = x_repr[:n//2] + "..." + x_repr[len(x_repr) - n//2:]
|
|
return x_repr
|
|
|
|
def default_doc_func(func, num, p):
|
|
if func.__doc__ is None:
|
|
return None
|
|
|
|
all_args_with_values = parameterized_argument_value_pairs(func, p)
|
|
|
|
# Assumes that the function passed is a bound method.
|
|
descs = ["%s=%s" %(n, short_repr(v)) for n, v in all_args_with_values]
|
|
|
|
# The documentation might be a multiline string, so split it
|
|
# and just work with the first string, ignoring the period
|
|
# at the end if there is one.
|
|
first, nl, rest = func.__doc__.lstrip().partition("\n")
|
|
suffix = ""
|
|
if first.endswith("."):
|
|
suffix = "."
|
|
first = first[:-1]
|
|
args = "%s[with %s]" %(len(first) and " " or "", ", ".join(descs))
|
|
return "".join([first.rstrip(), args, suffix, nl, rest])
|
|
|
|
def default_name_func(func, num, p):
|
|
base_name = func.__name__
|
|
name_suffix = "_%s" %(num, )
|
|
if len(p.args) > 0 and isinstance(p.args[0], string_types):
|
|
name_suffix += "_" + parameterized.to_safe_name(p.args[0])
|
|
return base_name + name_suffix
|
|
|
|
|
|
# force nose for numpy purposes.
|
|
_test_runner_override = 'nose'
|
|
_test_runner_guess = False
|
|
_test_runners = set(["unittest", "unittest2", "nose", "nose2", "pytest"])
|
|
_test_runner_aliases = {
|
|
"_pytest": "pytest",
|
|
}
|
|
|
|
def set_test_runner(name):
|
|
global _test_runner_override
|
|
if name not in _test_runners:
|
|
raise TypeError(
|
|
"Invalid test runner: %r (must be one of: %s)"
|
|
%(name, ", ".join(_test_runners)),
|
|
)
|
|
_test_runner_override = name
|
|
|
|
def detect_runner():
|
|
""" Guess which test runner we're using by traversing the stack and looking
|
|
for the first matching module. This *should* be reasonably safe, as
|
|
it's done during test disocvery where the test runner should be the
|
|
stack frame immediately outside. """
|
|
if _test_runner_override is not None:
|
|
return _test_runner_override
|
|
global _test_runner_guess
|
|
if _test_runner_guess is False:
|
|
stack = inspect.stack()
|
|
for record in reversed(stack):
|
|
frame = record[0]
|
|
module = frame.f_globals.get("__name__").partition(".")[0]
|
|
if module in _test_runner_aliases:
|
|
module = _test_runner_aliases[module]
|
|
if module in _test_runners:
|
|
_test_runner_guess = module
|
|
break
|
|
if record[1].endswith("python2.6/unittest.py"):
|
|
_test_runner_guess = "unittest"
|
|
break
|
|
else:
|
|
_test_runner_guess = None
|
|
return _test_runner_guess
|
|
|
|
class parameterized(object):
|
|
""" Parameterize a test case::
|
|
|
|
class TestInt(object):
|
|
@parameterized([
|
|
("A", 10),
|
|
("F", 15),
|
|
param("10", 42, base=42)
|
|
])
|
|
def test_int(self, input, expected, base=16):
|
|
actual = int(input, base=base)
|
|
assert_equal(actual, expected)
|
|
|
|
@parameterized([
|
|
(2, 3, 5)
|
|
(3, 5, 8),
|
|
])
|
|
def test_add(a, b, expected):
|
|
assert_equal(a + b, expected)
|
|
"""
|
|
|
|
def __init__(self, input, doc_func=None):
|
|
self.get_input = self.input_as_callable(input)
|
|
self.doc_func = doc_func or default_doc_func
|
|
|
|
def __call__(self, test_func):
|
|
self.assert_not_in_testcase_subclass()
|
|
|
|
@wraps(test_func)
|
|
def wrapper(test_self=None):
|
|
test_cls = test_self and type(test_self)
|
|
if test_self is not None:
|
|
if issubclass(test_cls, InstanceType):
|
|
raise TypeError((
|
|
"@parameterized can't be used with old-style classes, but "
|
|
"%r has an old-style class. Consider using a new-style "
|
|
"class, or '@parameterized.expand' "
|
|
"(see http://stackoverflow.com/q/54867/71522 for more "
|
|
"information on old-style classes)."
|
|
) %(test_self, ))
|
|
|
|
original_doc = wrapper.__doc__
|
|
for num, args in enumerate(wrapper.parameterized_input):
|
|
p = param.from_decorator(args)
|
|
unbound_func, nose_tuple = self.param_as_nose_tuple(test_self, test_func, num, p)
|
|
try:
|
|
wrapper.__doc__ = nose_tuple[0].__doc__
|
|
# Nose uses `getattr(instance, test_func.__name__)` to get
|
|
# a method bound to the test instance (as opposed to a
|
|
# method bound to the instance of the class created when
|
|
# tests were being enumerated). Set a value here to make
|
|
# sure nose can get the correct test method.
|
|
if test_self is not None:
|
|
setattr(test_cls, test_func.__name__, unbound_func)
|
|
yield nose_tuple
|
|
finally:
|
|
if test_self is not None:
|
|
delattr(test_cls, test_func.__name__)
|
|
wrapper.__doc__ = original_doc
|
|
wrapper.parameterized_input = self.get_input()
|
|
wrapper.parameterized_func = test_func
|
|
test_func.__name__ = "_parameterized_original_%s" %(test_func.__name__, )
|
|
return wrapper
|
|
|
|
def param_as_nose_tuple(self, test_self, func, num, p):
|
|
nose_func = wraps(func)(lambda *args: func(*args[:-1], **args[-1]))
|
|
nose_func.__doc__ = self.doc_func(func, num, p)
|
|
# Track the unbound function because we need to setattr the unbound
|
|
# function onto the class for nose to work (see comments above), and
|
|
# Python 3 doesn't let us pull the function out of a bound method.
|
|
unbound_func = nose_func
|
|
if test_self is not None:
|
|
# Under nose on Py2 we need to return an unbound method to make
|
|
# sure that the `self` in the method is properly shared with the
|
|
# `self` used in `setUp` and `tearDown`. But only there. Everyone
|
|
# else needs a bound method.
|
|
func_self = (
|
|
None if PY2 and detect_runner() == "nose" else
|
|
test_self
|
|
)
|
|
nose_func = make_method(nose_func, func_self, type(test_self))
|
|
return unbound_func, (nose_func, ) + p.args + (p.kwargs or {}, )
|
|
|
|
def assert_not_in_testcase_subclass(self):
|
|
parent_classes = self._terrible_magic_get_defining_classes()
|
|
if any(issubclass(cls, TestCase) for cls in parent_classes):
|
|
raise Exception("Warning: '@parameterized' tests won't work "
|
|
"inside subclasses of 'TestCase' - use "
|
|
"'@parameterized.expand' instead.")
|
|
|
|
def _terrible_magic_get_defining_classes(self):
|
|
""" Returns the set of parent classes of the class currently being defined.
|
|
Will likely only work if called from the ``parameterized`` decorator.
|
|
This function is entirely @brandon_rhodes's fault, as he suggested
|
|
the implementation: http://stackoverflow.com/a/8793684/71522
|
|
"""
|
|
stack = inspect.stack()
|
|
if len(stack) <= 4:
|
|
return []
|
|
frame = stack[4]
|
|
code_context = frame[4] and frame[4][0].strip()
|
|
if not (code_context and code_context.startswith("class ")):
|
|
return []
|
|
_, _, parents = code_context.partition("(")
|
|
parents, _, _ = parents.partition(")")
|
|
return eval("[" + parents + "]", frame[0].f_globals, frame[0].f_locals)
|
|
|
|
@classmethod
|
|
def input_as_callable(cls, input):
|
|
if callable(input):
|
|
return lambda: cls.check_input_values(input())
|
|
input_values = cls.check_input_values(input)
|
|
return lambda: input_values
|
|
|
|
@classmethod
|
|
def check_input_values(cls, input_values):
|
|
# Explicitly convert non-list inputs to a list so that:
|
|
# 1. A helpful exception will be raised if they aren't iterable, and
|
|
# 2. Generators are unwrapped exactly once (otherwise `nosetests
|
|
# --processes=n` has issues; see:
|
|
# https://github.com/wolever/nose-parameterized/pull/31)
|
|
if not isinstance(input_values, list):
|
|
input_values = list(input_values)
|
|
return [ param.from_decorator(p) for p in input_values ]
|
|
|
|
@classmethod
|
|
def expand(cls, input, name_func=None, doc_func=None, **legacy):
|
|
""" A "brute force" method of parameterizing test cases. Creates new
|
|
test cases and injects them into the namespace that the wrapped
|
|
function is being defined in. Useful for parameterizing tests in
|
|
subclasses of 'UnitTest', where Nose test generators don't work.
|
|
|
|
>>> @parameterized.expand([("foo", 1, 2)])
|
|
... def test_add1(name, input, expected):
|
|
... actual = add1(input)
|
|
... assert_equal(actual, expected)
|
|
...
|
|
>>> locals()
|
|
... 'test_add1_foo_0': <function ...> ...
|
|
>>>
|
|
"""
|
|
|
|
if "testcase_func_name" in legacy:
|
|
warnings.warn("testcase_func_name= is deprecated; use name_func=",
|
|
DeprecationWarning, stacklevel=2)
|
|
if not name_func:
|
|
name_func = legacy["testcase_func_name"]
|
|
|
|
if "testcase_func_doc" in legacy:
|
|
warnings.warn("testcase_func_doc= is deprecated; use doc_func=",
|
|
DeprecationWarning, stacklevel=2)
|
|
if not doc_func:
|
|
doc_func = legacy["testcase_func_doc"]
|
|
|
|
doc_func = doc_func or default_doc_func
|
|
name_func = name_func or default_name_func
|
|
|
|
def parameterized_expand_wrapper(f, instance=None):
|
|
stack = inspect.stack()
|
|
frame = stack[1]
|
|
frame_locals = frame[0].f_locals
|
|
|
|
parameters = cls.input_as_callable(input)()
|
|
for num, p in enumerate(parameters):
|
|
name = name_func(f, num, p)
|
|
frame_locals[name] = cls.param_as_standalone_func(p, f, name)
|
|
frame_locals[name].__doc__ = doc_func(f, num, p)
|
|
|
|
f.__test__ = False
|
|
return parameterized_expand_wrapper
|
|
|
|
@classmethod
|
|
def param_as_standalone_func(cls, p, func, name):
|
|
@wraps(func)
|
|
def standalone_func(*a):
|
|
return func(*(a + p.args), **p.kwargs)
|
|
standalone_func.__name__ = name
|
|
|
|
# place_as is used by py.test to determine what source file should be
|
|
# used for this test.
|
|
standalone_func.place_as = func
|
|
|
|
# Remove __wrapped__ because py.test will try to look at __wrapped__
|
|
# to determine which parameters should be used with this test case,
|
|
# and obviously we don't need it to do any parameterization.
|
|
try:
|
|
del standalone_func.__wrapped__
|
|
except AttributeError:
|
|
pass
|
|
return standalone_func
|
|
|
|
@classmethod
|
|
def to_safe_name(cls, s):
|
|
return str(re.sub("[^a-zA-Z0-9_]+", "_", s))
|