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Property aliases don't work right with super #18462

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687906e
Add some tests for cbook._define_aliases.
QuLogic Sep 12, 2020
43a4cf1
Add test of subclassing with cbook._define_aliases.
QuLogic Sep 12, 2020
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75 changes: 75 additions & 0 deletions lib/matplotlib/tests/test_cbook.py
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Original file line number Diff line number Diff line change
Expand Up @@ -298,6 +298,81 @@ def test_sanitize_sequence():
assert k == cbook.sanitize_sequence(k)


def test_define_aliases():
@cbook._define_aliases({'prop': ['alias1', 'alias2']})
class NoGetter:
def set_prop(self):
pass

@cbook._define_aliases({'prop': ['alias1', 'alias2']})
class NoSetter:
def get_prop(self):
pass

assert getattr(NoGetter, 'get_alias1', None) is None
assert getattr(NoGetter, 'set_alias1', None) is not None
assert getattr(NoGetter, 'get_alias2', None) is None
assert getattr(NoGetter, 'set_alias2', None) is not None
assert NoGetter._alias_map == {'prop': ['alias1', 'alias2']}

assert getattr(NoSetter, 'get_alias1', None) is not None
assert getattr(NoSetter, 'set_alias1', None) is None
assert getattr(NoSetter, 'get_alias2', None) is not None
assert getattr(NoSetter, 'set_alias2', None) is None
assert NoSetter._alias_map == {'prop': ['alias1', 'alias2']}


def test_define_aliases_invalid():
class Invalid:
pass

with pytest.raises(ValueError,
match="Neither getter nor setter exists for 'prop'"):
cbook._define_aliases({'prop': ['alias1', 'alias2']})(Invalid)


def test_define_aliases_subclass():
@cbook._define_aliases({'prop': ['alias']})
class Base:
def __init__(self):
self.call_count = {'Base:set_prop': 0}

def set_prop(self):
self.call_count['Base:set_prop'] += 1

class Derived(Base):
def __init__(self):
super().__init__()
self.call_count['Derived:set_prop'] = 0

def set_prop(self):
self.call_count['Derived:set_prop'] += 1

# Calling original or alias should run the same method.
b = Base()
b.set_prop()
assert b.call_count['Base:set_prop'] == 1
b.set_alias()
assert b.call_count['Base:set_prop'] == 2

d = Derived()
# Calling original or alias should run the same derived method.
d.set_prop()
assert d.call_count['Base:set_prop'] == 0
assert d.call_count['Derived:set_prop'] == 1
d.set_alias()
assert d.call_count['Base:set_prop'] == 0
assert d.call_count['Derived:set_prop'] == 2

# Calling original or alias should run the same base method.
Base.set_prop(d)
assert d.call_count['Base:set_prop'] == 1
assert d.call_count['Derived:set_prop'] == 2
Base.set_alias(d)
assert d.call_count['Base:set_prop'] == 2
assert d.call_count['Derived:set_prop'] == 2


fail_mapping = (
({'a': 1}, {'forbidden': ('a')}),
({'a': 1}, {'required': ('b')}),
Expand Down