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✏️ test_dict_version.py
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""" Test implementation of the PEP 509: dictionary versionning. """ import unittest from test import support # PEP 509 is implemented in CPython but other Python implementations # don't require to implement it _testcapi = support.import_module('_testcapi') class DictVersionTests(unittest.TestCase): type2test = dict def setUp(self): self.seen_versions = set() self.dict = None def check_version_unique(self, mydict): version = _testcapi.dict_get_version(mydict) self.assertNotIn(version, self.seen_versions) self.seen_versions.add(version) def check_version_changed(self, mydict, method, *args, **kw): result = method(*args, **kw) self.check_version_unique(mydict) return result def check_version_dont_change(self, mydict, method, *args, **kw): version1 = _testcapi.dict_get_version(mydict) self.seen_versions.add(version1) result = method(*args, **kw) version2 = _testcapi.dict_get_version(mydict) self.assertEqual(version2, version1, "version changed") return result def new_dict(self, *args, **kw): d = self.type2test(*args, **kw) self.check_version_unique(d) return d def test_constructor(self): # new empty dictionaries must all have an unique version empty1 = self.new_dict() empty2 = self.new_dict() empty3 = self.new_dict() # non-empty dictionaries must also have an unique version nonempty1 = self.new_dict(x='x') nonempty2 = self.new_dict(x='x', y='y') def test_copy(self): d = self.new_dict(a=1, b=2) d2 = self.check_version_dont_change(d, d.copy) # dict.copy() must create a dictionary with a new unique version self.check_version_unique(d2) def test_setitem(self): d = self.new_dict() # creating new keys must change the version self.check_version_changed(d, d.__setitem__, 'x', 'x') self.check_version_changed(d, d.__setitem__, 'y', 'y') # changing values must change the version self.check_version_changed(d, d.__setitem__, 'x', 1) self.check_version_changed(d, d.__setitem__, 'y', 2) def test_setitem_same_value(self): value = object() d = self.new_dict() # setting a key must change the version self.check_version_changed(d, d.__setitem__, 'key', value) # setting a key to the same value with dict.__setitem__ # must change the version self.check_version_dont_change(d, d.__setitem__, 'key', value) # setting a key to the same value with dict.update # must change the version self.check_version_dont_change(d, d.update, key=value) d2 = self.new_dict(key=value) self.check_version_dont_change(d, d.update, d2) def test_setitem_equal(self): class AlwaysEqual: def __eq__(self, other): return True value1 = AlwaysEqual() value2 = AlwaysEqual() self.assertTrue(value1 == value2) self.assertFalse(value1 != value2) d = self.new_dict() self.check_version_changed(d, d.__setitem__, 'key', value1) # setting a key to a value equal to the current value # with dict.__setitem__() must change the version self.check_version_changed(d, d.__setitem__, 'key', value2) # setting a key to a value equal to the current value # with dict.update() must change the version self.check_version_changed(d, d.update, key=value1) d2 = self.new_dict(key=value2) self.check_version_changed(d, d.update, d2) def test_setdefault(self): d = self.new_dict() # setting a key with dict.setdefault() must change the version self.check_version_changed(d, d.setdefault, 'key', 'value1') # don't change the version if the key already exists self.check_version_dont_change(d, d.setdefault, 'key', 'value2') def test_delitem(self): d = self.new_dict(key='value') # deleting a key with dict.__delitem__() must change the version self.check_version_changed(d, d.__delitem__, 'key') # don't change the version if the key doesn't exist self.check_version_dont_change(d, self.assertRaises, KeyError, d.__delitem__, 'key') def test_pop(self): d = self.new_dict(key='value') # pop() must change the version if the key exists self.check_version_changed(d, d.pop, 'key') # pop() must not change the version if the key does not exist self.check_version_dont_change(d, self.assertRaises, KeyError, d.pop, 'key') def test_popitem(self): d = self.new_dict(key='value') # popitem() must change the version if the dict is not empty self.check_version_changed(d, d.popitem) # popitem() must not change the version if the dict is empty self.check_version_dont_change(d, self.assertRaises, KeyError, d.popitem) def test_update(self): d = self.new_dict(key='value') # update() calling with no argument must not change the version self.check_version_dont_change(d, d.update) # update() must change the version self.check_version_changed(d, d.update, key='new value') d2 = self.new_dict(key='value 3') self.check_version_changed(d, d.update, d2) def test_clear(self): d = self.new_dict(key='value') # clear() must change the version if the dict is not empty self.check_version_changed(d, d.clear) # clear() must not change the version if the dict is empty self.check_version_dont_change(d, d.clear) class Dict(dict): pass class DictSubtypeVersionTests(DictVersionTests): type2test = Dict if __name__ == "__main__": unittest.main()
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