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# Copyright (c) 2015-2019, Activision Publishing, Inc.
# 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.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE 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.
import sys
import collections
if sys.version_info[0] == 3:
Iterable = collections.abc.Iterable
else:
Iterable = collections.Iterable
__tracebackhide__ = True
class DynamicMixin(object):
"""Dynamic assertions mixin.
When testing attributes of an object (or the contents of a dict), the
:meth:`~assertpy.base.BaseMixin.is_equal_to` assertion can be a bit verbose::
fred = Person('Fred', 'Smith')
assert_that(fred.first_name).is_equal_to('Fred')
assert_that(fred.name).is_equal_to('Fred Smith')
assert_that(fred.say_hello()).is_equal_to('Hello, Fred!')
Instead, use dynamic assertions in the form of ``has_<name>()`` where ``<name>`` is the name of
any attribute, property, or zero-argument method on the given object. Dynamic equality
assertions test if actual is equal to expected using the ``==`` operator. Using dynamic
assertions, we can rewrite the above example as::
assert_that(fred).has_first_name('Fred')
assert_that(fred).has_name('Fred Smith')
assert_that(fred).has_say_hello('Hello, Fred!')
Similarly, dynamic assertions also work on any *dict-like* object::
fred = {
'first_name': 'Fred',
'last_name': 'Smith',
'shoe_size': 12
}
assert_that(fred).has_first_name('Fred')
assert_that(fred).has_last_name('Smith')
assert_that(fred).has_shoe_size(12)
"""
def __getattr__(self, attr):
"""Asserts that val has attribute attr and that its value is equal to other via a dynamic
assertion of the form ``has_<attr>()``."""
if not attr.startswith('has_'):
raise AttributeError('assertpy has no assertion <%s()>' % attr)
attr_name = attr[4:]
err_msg = False
is_dict = isinstance(self.val, Iterable) and hasattr(self.val, '__getitem__')
if not hasattr(self.val, attr_name):
if is_dict:
if attr_name not in self.val:
err_msg = 'Expected key <%s>, but val has no key <%s>.' % (attr_name, attr_name)
else:
err_msg = 'Expected attribute <%s>, but val has no attribute <%s>.' % (attr_name, attr_name)
def _wrapper(*args, **kwargs):
if err_msg:
self.error(err_msg) # ok to raise AssertionError now that we are inside wrapper
else:
if len(args) != 1:
raise TypeError('assertion <%s()> takes exactly 1 argument (%d given)' % (attr, len(args)))
if is_dict:
val_attr = self.val[attr_name]
else:
val_attr = getattr(self.val, attr_name)
if callable(val_attr):
try:
actual = val_attr()
except TypeError:
raise TypeError('val does not have zero-arg method <%s()>' % attr_name)
else:
actual = val_attr
expected = args[0]
if actual != expected:
self.error('Expected <%s> to be equal to <%s> on %s <%s>, but was not.' % (actual, expected, 'key' if is_dict else 'attribute', attr_name))
return self
return _wrapper
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