def test_basic_gc(self):
count0 = bar.Foo.instance_count
f = bar.Foo("hello")
self.assertEqual(bar.Foo.instance_count, count0 + 1)
self.assertEqual(f.get_datum(), "hello")
del f
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0)
def test_class_takes_foo_subclassing(self):
count0 = bar.Foo.instance_count
f = bar.Foo("hello45")
self.assertEqual(bar.Foo.instance_count, count0 + 1)
self.assertEqual(f.get_datum(), "hello45")
class Takes(bar.ClassThatTakesFoo):
def get_modified_foo(self, foo):
d = foo.get_datum()
return bar.Foo(d+"xxx")
takes = Takes(f)
del f
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0+1)
f1 = takes.get_foo()
self.assertEqual(f1.get_datum(), "hello45")
self.assertEqual(bar.Foo.instance_count, count0+1)
f2 = bar.Foo("helloyyy")
self.assertEqual(bar.Foo.instance_count, count0+2)
f3 = takes.get_modified_foo(f2)
self.assertEqual(bar.Foo.instance_count, count0+3)
self.assertEqual(f3.get_datum(), "helloyyyxxx")
del f1, f2, f3, takes
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0)
def test_function_takes_foo(self):
count0 = bar.Foo.instance_count
f = bar.Foo("hello123")
self.assertEqual(bar.Foo.instance_count, count0 + 1)
self.assertEqual(f.get_datum(), "hello123")
bar.function_that_takes_foo(f)
del f
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0+1) # the object stays alive
f1 = bar.function_that_returns_foo()
self.assertEqual(f1.get_datum(), "hello123")
self.assertEqual(bar.Foo.instance_count, count0+1)
del f1
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0+1) # the object stays alive
def test_class_takes_foo(self):
count0 = bar.Foo.instance_count
f = bar.Foo("hello12")
self.assertEqual(bar.Foo.instance_count, count0 + 1)
self.assertEqual(f.get_datum(), "hello12")
takes = bar.ClassThatTakesFoo(f)
del f
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0+1) # the object stays alive
f1 = takes.get_foo()
self.assertEqual(f1.get_datum(), "hello12")
self.assertEqual(bar.Foo.instance_count, count0+1)
del f1, takes
while gc.collect():
pass
self.assertEqual(bar.Foo.instance_count, count0)
def get_modified_foo(self, foo):
d = foo.get_datum()
return bar.Foo(d+"xxx")