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import gi
from chrysacase import ChrysalideTestCase
from gi.repository import GObject
from pychrysalide.glibext import HashableObject
class TestStringBuilder(ChrysalideTestCase):
"""Test cases for pychrysalide.glibext.HashableObject."""
def testHashableObjectCreation(self):
"""Create objects with HashableObject interface."""
with self.assertRaisesRegex(NotImplementedError, 'HashableObject can not be constructed'):
ho = HashableObject()
class NewHashableObjectImplem(gi._gi.GObject, HashableObject):
pass
nho = NewHashableObjectImplem()
self.assertIsNotNone(nho)
class NewHashableObjectImplem2(GObject.Object, HashableObject):
pass
nho2 = NewHashableObjectImplem()
self.assertIsNotNone(nho2)
def testHashableObjectMethods(self):
"""Test the HashableObject methods."""
class BasicHashableObjectImplem(gi._gi.GObject, HashableObject):
def __init__(self, val):
super().__init__()
self._val = val
def _hash(self):
return self._val
value = 1234
ho = BasicHashableObjectImplem(value)
self.assertEqual(hash(ho), value)
class BasicHashableObjectImplem2(GObject.Object, HashableObject):
def __init__(self, val):
super().__init__()
self._val = val
def _hash(self):
return self._val
value = 5678
ho2 = BasicHashableObjectImplem2(value)
self.assertEqual(hash(ho2), value)
def testCascadingHashableObjectImplementations(self):
"""Request the hash from the object parent for a full computing."""
class CascadingHashableObjectFullImplemA(GObject.Object, HashableObject):
def _hash(self):
return 1
class CascadingHashableObjectFullImplemB(CascadingHashableObjectFullImplemA, HashableObject):
def _hash(self):
return super()._hash() * 2
class CascadingHashableObjectFullImplemC(CascadingHashableObjectFullImplemB, HashableObject):
def _hash(self):
return super()._hash() * 3
obj_a = CascadingHashableObjectFullImplemA()
obj_b = CascadingHashableObjectFullImplemB()
obj_c = CascadingHashableObjectFullImplemC()
self.assertEqual(hash(obj_a), 1)
self.assertEqual(hash(obj_b), 2)
self.assertEqual(hash(obj_c), 6)
class CascadingHashableObjectPartialImplemA(GObject.Object, HashableObject):
def _hash(self):
return 1
class CascadingHashableObjectPartialImplemB(CascadingHashableObjectPartialImplemA):
pass
class CascadingHashableObjectPartialImplemC(CascadingHashableObjectPartialImplemB, HashableObject):
def _hash(self):
return super()._hash() * 3
obj_a = CascadingHashableObjectPartialImplemA()
obj_b = CascadingHashableObjectPartialImplemB()
obj_c = CascadingHashableObjectPartialImplemC()
self.assertEqual(hash(obj_a), 1)
self.assertEqual(hash(obj_b), 1)
self.assertEqual(hash(obj_c), 3)
def testHashableObjectExceptions(self):
"""Raise exceptions from the HashableObject interface as expected."""
class BadHashableObjectImplem(GObject.Object, HashableObject):
pass
obj = BadHashableObjectImplem()
with self.assertRaisesRegex(NotImplementedError, "method implementation is missing for '_hash'"):
h = hash(obj)
with self.assertRaisesRegex(TypeError, 'object parent does not implement the HashableObject interface'):
h = obj.parent_hash()
class BadHashableObjectImplem2(GObject.Object, HashableObject):
def _hash(self):
return 'AAA'
obj2 = BadHashableObjectImplem2()
with self.assertRaisesRegex(TypeError, 'computed hash value has to be an unsigned integer'):
h = hash(obj2)
class BadHashableObjectImplem3a(GObject.Object, HashableObject):
def _hash(self):
return 123
class BadHashableObjectImplem3b(BadHashableObjectImplem3a, HashableObject):
def _hash(self):
return self.parent_hash()
obj3 = BadHashableObjectImplem3b()
with self.assertRaisesRegex(RuntimeError, 'object parent is not a native type'):
h = hash(obj3)
class BadHashableObjectImplem4(GObject.Object, HashableObject):
def _hash(self):
raise Exception('error')
obj4 = BadHashableObjectImplem4()
with self.assertRaisesRegex(Exception, 'error'):
h = hash(obj4)
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