[英]pytest object equality with __eq__ overriden
我正在將peewee用於一個項目,並且在測試時遇到問題。 我想檢查是否已使用特定參數(即peewee表達式)調用了函數。 這里的問題是peewee.Expression會覆蓋__eq__運算符: https : //github.com/coleifer/peewee/blob/master/peewee.py#L379
因此,現在放在==
表達式右側的任何內容都將返回一個新表達式,並由pytest評估為True。
pytest庫中是否有某些東西通過屬性而不是使用==
運算符來測試對象的相等性?
對於那些有興趣的人,我找到了一種可以輕松執行的解決方案
def _extract_call_dict(name, args, kwargs=None):
"""Checks if the current element has an overriden __eq__ method"""
if kwargs is None:
# mock._Call is a superclass of Tuple and can have
# 2 or 3 elements. So, I unpack them and ajust my args accordingly
args, kwargs = name, args
# This check can be improved, my use case is pretty simple,
# so I only check types
has_eq_overriden = lambda obj: (isinstance(obj, peewee.Model) or
isinstance(obj, peewee.Expression))
# Replace the object by its dict representation if boolean is True
get_dict = lambda obj: obj.__dict__ if has_eq_overriden(obj) else obj
# apply this treatment for every elements from _Call
args = [get_dict(arg) for arg in args]
kwargs = {key: get_dict(value) for key, value in kwargs.items()}
# return a new instance
return mock.call(args, kwargs)
class _Call(mock._Call):
"""Override the _Call class from mock"""
def __eq__(self, other):
"""This will be use every time you try to compare
mock.call statements
"""
self_replacement = _extract_call_dict(*self)
if isinstance(other, mock._Call):
other = _extract_call_dict(*other)
return super(_Call, self_replacement).__eq__(other)
# Override mock.call to be compliant with peewee __eq__ override
unittest.mock._Call = test.utils._Call
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