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test_inheritance_invariant.py
409 lines (315 loc) · 12.8 KB
/
test_inheritance_invariant.py
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# pylint: disable=invalid-name
# pylint: disable=missing-docstring
# pylint: disable=unused-argument
# pylint: disable=no-member
import abc
import unittest
from typing import Optional # pylint: disable=unused-import
import icontract
import tests.error
class TestOK(unittest.TestCase):
def test_count_checks(self) -> None:
class Increment:
count = 0
def __call__(self) -> bool:
Increment.count += 1
return True
inc = Increment()
@icontract.invariant(lambda self: inc())
class A(icontract.DBC):
def __repr__(self) -> str:
return "instance of A"
def some_func(self) -> int: # pylint: disable=no-self-use
return 1
class B(A):
def __repr__(self) -> str:
return "instance of B"
def some_func(self) -> int:
return 2
inst = B()
self.assertEqual(1, Increment.count, "Invariant is expected to run only once at the initializer.")
inst.some_func()
self.assertEqual(3, Increment.count, "Invariant is expected to run before and after the method call.")
class TestViolation(unittest.TestCase):
def test_inherited(self) -> None:
@icontract.invariant(lambda self: self.x > 0)
class A(icontract.DBC):
def __init__(self) -> None:
self.x = 10
def func(self) -> None:
self.x = -1
def __repr__(self) -> str:
return "instance of A"
class B(A):
def __repr__(self) -> str:
return "instance of B"
b = B()
violation_error = None # type: Optional[icontract.ViolationError]
try:
b.func()
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual("self.x > 0:\n"
"self was instance of B\n"
"self.x was -1", tests.error.wo_mandatory_location(str(violation_error)))
def test_inherited_violated_in_child(self) -> None:
@icontract.invariant(lambda self: self.x > 0)
class A(icontract.DBC):
def __init__(self) -> None:
self.x = 10
def func(self) -> None:
self.x = 100
def __repr__(self) -> str:
return "instance of A"
class B(A):
def func(self) -> None:
self.x = -1
def __repr__(self) -> str:
return "instance of B"
b = B()
violation_error = None # type: Optional[icontract.ViolationError]
try:
b.func()
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual("self.x > 0:\n"
"self was instance of B\n"
"self.x was -1", tests.error.wo_mandatory_location(str(violation_error)))
def test_additional_invariant_violated_in_childs_init(self) -> None:
@icontract.invariant(lambda self: self.x > 0)
class A(icontract.DBC):
def __init__(self) -> None:
self.x = 10
def __repr__(self) -> str:
return "instance of A"
@icontract.invariant(lambda self: self.x > 100)
class B(A):
def __repr__(self) -> str:
return "instance of B"
violation_error = None # type: Optional[icontract.ViolationError]
try:
_ = B()
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual("self.x > 100:\n"
"self was instance of B\n"
"self.x was 10", tests.error.wo_mandatory_location(str(violation_error)))
def test_method_violates_in_child(self) -> None:
@icontract.invariant(lambda self: self.x > 0)
class A(icontract.DBC):
def __init__(self) -> None:
self.x = 1000
def some_method(self) -> None:
self.x = 10
def __repr__(self) -> str:
return "instance of A"
@icontract.invariant(lambda self: self.x > 100)
class B(A):
def __repr__(self) -> str:
return "instance of B"
b = B()
violation_error = None # type: Optional[icontract.ViolationError]
try:
b.some_method()
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual("self.x > 100:\n"
"self was instance of B\n"
"self.x was 10", tests.error.wo_mandatory_location(str(violation_error)))
def test_triple_inheritance(self) -> None:
@icontract.invariant(lambda self: self.x > 0)
class A(icontract.DBC):
def __init__(self) -> None:
self.x = 10
def func(self) -> None:
self.x = -1
def __repr__(self) -> str:
return "instance of A"
class B(A):
def __repr__(self) -> str:
return "instance of B"
class C(B):
def __repr__(self) -> str:
return "instance of C"
c = C()
violation_error = None # type: Optional[icontract.ViolationError]
try:
c.func()
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual("self.x > 0:\n"
"self was instance of C\n"
"self.x was -1", tests.error.wo_mandatory_location(str(violation_error)))
def test_with_abstract_method(self) -> None:
@icontract.invariant(lambda self: self.x > 0)
class A(icontract.DBC):
def __init__(self) -> None:
self.x = 10
@abc.abstractmethod
def func(self) -> None:
pass
def __repr__(self) -> str:
return "instance of A"
class B(A):
def func(self) -> None:
self.x = -1
def __repr__(self) -> str:
return "instance of B"
b = B()
violation_error = None # type: Optional[icontract.ViolationError]
try:
b.func()
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual("self.x > 0:\n"
"self was instance of B\n"
"self.x was -1", tests.error.wo_mandatory_location(str(violation_error)))
class TestProperty(unittest.TestCase):
def test_inherited_getter(self) -> None:
@icontract.invariant(lambda self: not self.toggled)
class SomeBase(icontract.DBC):
def __init__(self) -> None:
self.toggled = False
@property
def some_prop(self) -> int:
self.toggled = True
return 0
class SomeClass(SomeBase):
def __repr__(self) -> str:
return self.__class__.__name__
some_inst = SomeClass()
violation_error = None # type: Optional[icontract.ViolationError]
try:
_ = some_inst.some_prop
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual('not self.toggled:\n'
'self was SomeClass\n'
'self.toggled was True', tests.error.wo_mandatory_location(str(violation_error)))
def test_inherited_setter(self) -> None:
@icontract.invariant(lambda self: not self.toggled)
class SomeBase(icontract.DBC):
def __init__(self) -> None:
self.toggled = False
@property
def some_prop(self) -> int:
return 0
@some_prop.setter
def some_prop(self, value: int) -> None:
self.toggled = True
class SomeClass(SomeBase):
def __repr__(self) -> str:
return self.__class__.__name__
some_inst = SomeClass()
violation_error = None # type: Optional[icontract.ViolationError]
try:
some_inst.some_prop = 0
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual('not self.toggled:\n'
'self was SomeClass\n'
'self.toggled was True', tests.error.wo_mandatory_location(str(violation_error)))
def test_inherited_deleter(self) -> None:
@icontract.invariant(lambda self: not self.toggled)
class SomeBase(icontract.DBC):
def __init__(self) -> None:
self.toggled = False
@property
def some_prop(self) -> int:
return 0
@some_prop.deleter
def some_prop(self) -> None:
self.toggled = True
class SomeClass(SomeBase):
def __repr__(self) -> str:
return self.__class__.__name__
some_inst = SomeClass()
violation_error = None # type: Optional[icontract.ViolationError]
try:
del some_inst.some_prop
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual('not self.toggled:\n'
'self was SomeClass\n'
'self.toggled was True', tests.error.wo_mandatory_location(str(violation_error)))
def test_inherited_invariant_on_getter(self) -> None:
@icontract.invariant(lambda self: not self.toggled)
class SomeBase(icontract.DBC):
def __init__(self) -> None:
self.toggled = False
class SomeClass(SomeBase):
@property
def some_prop(self) -> int:
self.toggled = True
return 0
def __repr__(self) -> str:
return self.__class__.__name__
some_inst = SomeClass()
violation_error = None # type: Optional[icontract.ViolationError]
try:
_ = some_inst.some_prop
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual('not self.toggled:\n'
'self was SomeClass\n'
'self.toggled was True', tests.error.wo_mandatory_location(str(violation_error)))
def test_inherited_invariant_on_setter(self) -> None:
@icontract.invariant(lambda self: not self.toggled)
class SomeBase(icontract.DBC):
def __init__(self) -> None:
self.toggled = False
class SomeClass(SomeBase):
@property
def some_prop(self) -> int:
return 0
@some_prop.setter
def some_prop(self, value: int) -> None:
self.toggled = True
def __repr__(self) -> str:
return self.__class__.__name__
some_inst = SomeClass()
violation_error = None # type: Optional[icontract.ViolationError]
try:
some_inst.some_prop = 0
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual('not self.toggled:\n'
'self was SomeClass\n'
'self.toggled was True', tests.error.wo_mandatory_location(str(violation_error)))
def test_inherited_invariant_on_deleter(self) -> None:
@icontract.invariant(lambda self: not self.toggled)
class SomeBase(icontract.DBC):
def __init__(self) -> None:
self.toggled = False
class SomeClass(SomeBase):
@property
def some_prop(self) -> int:
return 0
@some_prop.deleter
def some_prop(self) -> None:
self.toggled = True
def __repr__(self) -> str:
return self.__class__.__name__
some_inst = SomeClass()
violation_error = None # type: Optional[icontract.ViolationError]
try:
del some_inst.some_prop
except icontract.ViolationError as err:
violation_error = err
self.assertIsNotNone(violation_error)
self.assertEqual('not self.toggled:\n'
'self was SomeClass\n'
'self.toggled was True', tests.error.wo_mandatory_location(str(violation_error)))
if __name__ == '__main__':
unittest.main()