# Run the _testcapi module tests (tests for the Python/C API): by defn, # these are all functions _testcapi exports whose name begins with 'test_'. from collections import OrderedDict from contextlib import contextmanager, ExitStack import _thread import importlib.machinery import importlib.util import os import pickle import random import re import subprocess import sys import textwrap import threading import time import unittest import warnings import weakref from test import support from test.support import MISSING_C_DOCSTRINGS from test.support import catch_unraisable_exception from test.support import import_helper from test.support import threading_helper from test.support import warnings_helper from test.support.script_helper import assert_python_failure, assert_python_ok try: import _posixsubprocess except ImportError: _posixsubprocess = None try: import _testmultiphase except ImportError: _testmultiphase = None # Skip this test if the _testcapi module isn't available. _testcapi = import_helper.import_module('_testcapi') import _testinternalcapi def decode_stderr(err): return err.decode('utf-8', 'replace').replace('\r', '') def testfunction(self): """some doc""" return self class InstanceMethod: id = _testcapi.instancemethod(id) testfunction = _testcapi.instancemethod(testfunction) class CAPITest(unittest.TestCase): def test_instancemethod(self): inst = InstanceMethod() self.assertEqual(id(inst), inst.id()) self.assertTrue(inst.testfunction() is inst) self.assertEqual(inst.testfunction.__doc__, testfunction.__doc__) self.assertEqual(InstanceMethod.testfunction.__doc__, testfunction.__doc__) InstanceMethod.testfunction.attribute = "test" self.assertEqual(testfunction.attribute, "test") self.assertRaises(AttributeError, setattr, inst.testfunction, "attribute", "test") @support.requires_subprocess() def test_no_FatalError_infinite_loop(self): with support.SuppressCrashReport(): p = subprocess.Popen([sys.executable, "-c", 'import _testcapi;' '_testcapi.crash_no_current_thread()'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True) (out, err) = p.communicate() self.assertEqual(out, '') # This used to cause an infinite loop. msg = ("Fatal Python error: PyThreadState_Get: " "the function must be called with the GIL held, " "after Python initialization and before Python finalization, " "but the GIL is released " "(the current Python thread state is NULL)") self.assertTrue(err.rstrip().startswith(msg), err) def test_memoryview_from_NULL_pointer(self): self.assertRaises(ValueError, _testcapi.make_memoryview_from_NULL_pointer) def test_exception(self): raised_exception = ValueError("5") new_exc = TypeError("TEST") try: raise raised_exception except ValueError as e: orig_sys_exception = sys.exception() orig_exception = _testcapi.set_exception(new_exc) new_sys_exception = sys.exception() new_exception = _testcapi.set_exception(orig_exception) reset_sys_exception = sys.exception() self.assertEqual(orig_exception, e) self.assertEqual(orig_exception, raised_exception) self.assertEqual(orig_sys_exception, orig_exception) self.assertEqual(reset_sys_exception, orig_exception) self.assertEqual(new_exception, new_exc) self.assertEqual(new_sys_exception, new_exception) else: self.fail("Exception not raised") def test_exc_info(self): raised_exception = ValueError("5") new_exc = TypeError("TEST") try: raise raised_exception except ValueError as e: tb = e.__traceback__ orig_sys_exc_info = sys.exc_info() orig_exc_info = _testcapi.set_exc_info(new_exc.__class__, new_exc, None) new_sys_exc_info = sys.exc_info() new_exc_info = _testcapi.set_exc_info(*orig_exc_info) reset_sys_exc_info = sys.exc_info() self.assertEqual(orig_exc_info[1], e) self.assertSequenceEqual(orig_exc_info, (raised_exception.__class__, raised_exception, tb)) self.assertSequenceEqual(orig_sys_exc_info, orig_exc_info) self.assertSequenceEqual(reset_sys_exc_info, orig_exc_info) self.assertSequenceEqual(new_exc_info, (new_exc.__class__, new_exc, None)) self.assertSequenceEqual(new_sys_exc_info, new_exc_info) else: self.assertTrue(False) @unittest.skipUnless(_posixsubprocess, '_posixsubprocess required for this test.') def test_seq_bytes_to_charp_array(self): # Issue #15732: crash in _PySequence_BytesToCharpArray() class Z(object): def __len__(self): return 1 self.assertRaises(TypeError, _posixsubprocess.fork_exec, 1,Z(),3,(1, 2),5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23) # Issue #15736: overflow in _PySequence_BytesToCharpArray() class Z(object): def __len__(self): return sys.maxsize def __getitem__(self, i): return b'x' self.assertRaises(MemoryError, _posixsubprocess.fork_exec, 1,Z(),3,(1, 2),5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23) @unittest.skipUnless(_posixsubprocess, '_posixsubprocess required for this test.') def test_subprocess_fork_exec(self): class Z(object): def __len__(self): return 1 # Issue #15738: crash in subprocess_fork_exec() self.assertRaises(TypeError, _posixsubprocess.fork_exec, Z(),[b'1'],3,(1, 2),5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23) @unittest.skipIf(MISSING_C_DOCSTRINGS, "Signature information for builtins requires docstrings") def test_docstring_signature_parsing(self): self.assertEqual(_testcapi.no_docstring.__doc__, None) self.assertEqual(_testcapi.no_docstring.__text_signature__, None) self.assertEqual(_testcapi.docstring_empty.__doc__, None) self.assertEqual(_testcapi.docstring_empty.__text_signature__, None) self.assertEqual(_testcapi.docstring_no_signature.__doc__, "This docstring has no signature.") self.assertEqual(_testcapi.docstring_no_signature.__text_signature__, None) self.assertEqual(_testcapi.docstring_with_invalid_signature.__doc__, "docstring_with_invalid_signature($module, /, boo)\n" "\n" "This docstring has an invalid signature." ) self.assertEqual(_testcapi.docstring_with_invalid_signature.__text_signature__, None) self.assertEqual(_testcapi.docstring_with_invalid_signature2.__doc__, "docstring_with_invalid_signature2($module, /, boo)\n" "\n" "--\n" "\n" "This docstring also has an invalid signature." ) self.assertEqual(_testcapi.docstring_with_invalid_signature2.__text_signature__, None) self.assertEqual(_testcapi.docstring_with_signature.__doc__, "This docstring has a valid signature.") self.assertEqual(_testcapi.docstring_with_signature.__text_signature__, "($module, /, sig)") self.assertEqual(_testcapi.docstring_with_signature_but_no_doc.__doc__, None) self.assertEqual(_testcapi.docstring_with_signature_but_no_doc.__text_signature__, "($module, /, sig)") self.assertEqual(_testcapi.docstring_with_signature_and_extra_newlines.__doc__, "\nThis docstring has a valid signature and some extra newlines.") self.assertEqual(_testcapi.docstring_with_signature_and_extra_newlines.__text_signature__, "($module, /, parameter)") def test_c_type_with_matrix_multiplication(self): M = _testcapi.matmulType m1 = M() m2 = M() self.assertEqual(m1 @ m2, ("matmul", m1, m2)) self.assertEqual(m1 @ 42, ("matmul", m1, 42)) self.assertEqual(42 @ m1, ("matmul", 42, m1)) o = m1 o @= m2 self.assertEqual(o, ("imatmul", m1, m2)) o = m1 o @= 42 self.assertEqual(o, ("imatmul", m1, 42)) o = 42 o @= m1 self.assertEqual(o, ("matmul", 42, m1)) def test_c_type_with_ipow(self): # When the __ipow__ method of a type was implemented in C, using the # modulo param would cause segfaults. o = _testcapi.ipowType() self.assertEqual(o.__ipow__(1), (1, None)) self.assertEqual(o.__ipow__(2, 2), (2, 2)) def test_return_null_without_error(self): # Issue #23571: A function must not return NULL without setting an # error if support.Py_DEBUG: code = textwrap.dedent(""" import _testcapi from test import support with support.SuppressCrashReport(): _testcapi.return_null_without_error() """) rc, out, err = assert_python_failure('-c', code) err = decode_stderr(err) self.assertRegex(err, r'Fatal Python error: _Py_CheckFunctionResult: ' r'a function returned NULL without setting an exception\n' r'Python runtime state: initialized\n' r'SystemError: ' r'returned NULL without setting an exception\n' r'\n' r'Current thread.*:\n' r' File .*", line 6 in \n') else: with self.assertRaises(SystemError) as cm: _testcapi.return_null_without_error() self.assertRegex(str(cm.exception), 'return_null_without_error.* ' 'returned NULL without setting an exception') def test_return_result_with_error(self): # Issue #23571: A function must not return a result with an error set if support.Py_DEBUG: code = textwrap.dedent(""" import _testcapi from test import support with support.SuppressCrashReport(): _testcapi.return_result_with_error() """) rc, out, err = assert_python_failure('-c', code) err = decode_stderr(err) self.assertRegex(err, r'Fatal Python error: _Py_CheckFunctionResult: ' r'a function returned a result with an exception set\n' r'Python runtime state: initialized\n' r'ValueError\n' r'\n' r'The above exception was the direct cause ' r'of the following exception:\n' r'\n' r'SystemError: ' r'returned a result with an exception set\n' r'\n' r'Current thread.*:\n' r' File .*, line 6 in \n') else: with self.assertRaises(SystemError) as cm: _testcapi.return_result_with_error() self.assertRegex(str(cm.exception), 'return_result_with_error.* ' 'returned a result with an exception set') def test_getitem_with_error(self): # Test _Py_CheckSlotResult(). Raise an exception and then calls # PyObject_GetItem(): check that the assertion catches the bug. # PyObject_GetItem() must not be called with an exception set. code = textwrap.dedent(""" import _testcapi from test import support with support.SuppressCrashReport(): _testcapi.getitem_with_error({1: 2}, 1) """) rc, out, err = assert_python_failure('-c', code) err = decode_stderr(err) if 'SystemError: ' not in err: self.assertRegex(err, r'Fatal Python error: _Py_CheckSlotResult: ' r'Slot __getitem__ of type dict succeeded ' r'with an exception set\n' r'Python runtime state: initialized\n' r'ValueError: bug\n' r'\n' r'Current thread .* \(most recent call first\):\n' r' File .*, line 6 in \n' r'\n' r'Extension modules: _testcapi \(total: 1\)\n') else: # Python built with NDEBUG macro defined: # test _Py_CheckFunctionResult() instead. self.assertIn('returned a result with an exception set', err) def test_buildvalue_N(self): _testcapi.test_buildvalue_N() def test_set_nomemory(self): code = """if 1: import _testcapi class C(): pass # The first loop tests both functions and that remove_mem_hooks() # can be called twice in a row. The second loop checks a call to # set_nomemory() after a call to remove_mem_hooks(). The third # loop checks the start and stop arguments of set_nomemory(). for outer_cnt in range(1, 4): start = 10 * outer_cnt for j in range(100): if j == 0: if outer_cnt != 3: _testcapi.set_nomemory(start) else: _testcapi.set_nomemory(start, start + 1) try: C() except MemoryError as e: if outer_cnt != 3: _testcapi.remove_mem_hooks() print('MemoryError', outer_cnt, j) _testcapi.remove_mem_hooks() break """ rc, out, err = assert_python_ok('-c', code) lines = out.splitlines() for i, line in enumerate(lines, 1): self.assertIn(b'MemoryError', out) *_, count = line.split(b' ') count = int(count) self.assertLessEqual(count, i*5) self.assertGreaterEqual(count, i*5-2) def test_mapping_keys_values_items(self): class Mapping1(dict): def keys(self): return list(super().keys()) def values(self): return list(super().values()) def items(self): return list(super().items()) class Mapping2(dict): def keys(self): return tuple(super().keys()) def values(self): return tuple(super().values()) def items(self): return tuple(super().items()) dict_obj = {'foo': 1, 'bar': 2, 'spam': 3} for mapping in [{}, OrderedDict(), Mapping1(), Mapping2(), dict_obj, OrderedDict(dict_obj), Mapping1(dict_obj), Mapping2(dict_obj)]: self.assertListEqual(_testcapi.get_mapping_keys(mapping), list(mapping.keys())) self.assertListEqual(_testcapi.get_mapping_values(mapping), list(mapping.values())) self.assertListEqual(_testcapi.get_mapping_items(mapping), list(mapping.items())) def test_mapping_keys_values_items_bad_arg(self): self.assertRaises(AttributeError, _testcapi.get_mapping_keys, None) self.assertRaises(AttributeError, _testcapi.get_mapping_values, None) self.assertRaises(AttributeError, _testcapi.get_mapping_items, None) class BadMapping: def keys(self): return None def values(self): return None def items(self): return None bad_mapping = BadMapping() self.assertRaises(TypeError, _testcapi.get_mapping_keys, bad_mapping) self.assertRaises(TypeError, _testcapi.get_mapping_values, bad_mapping) self.assertRaises(TypeError, _testcapi.get_mapping_items, bad_mapping) def test_mapping_has_key(self): dct = {'a': 1} self.assertTrue(_testcapi.mapping_has_key(dct, 'a')) self.assertFalse(_testcapi.mapping_has_key(dct, 'b')) class SubDict(dict): pass dct2 = SubDict({'a': 1}) self.assertTrue(_testcapi.mapping_has_key(dct2, 'a')) self.assertFalse(_testcapi.mapping_has_key(dct2, 'b')) @unittest.skipUnless(hasattr(_testcapi, 'negative_refcount'), 'need _testcapi.negative_refcount') def test_negative_refcount(self): # bpo-35059: Check that Py_DECREF() reports the correct filename # when calling _Py_NegativeRefcount() to abort Python. code = textwrap.dedent(""" import _testcapi from test import support with support.SuppressCrashReport(): _testcapi.negative_refcount() """) rc, out, err = assert_python_failure('-c', code) self.assertRegex(err, br'_testcapimodule\.c:[0-9]+: ' br'_Py_NegativeRefcount: Assertion failed: ' br'object has negative ref count') def test_trashcan_subclass(self): # bpo-35983: Check that the trashcan mechanism for "list" is NOT # activated when its tp_dealloc is being called by a subclass from _testcapi import MyList L = None for i in range(1000): L = MyList((L,)) @support.requires_resource('cpu') def test_trashcan_python_class1(self): self.do_test_trashcan_python_class(list) @support.requires_resource('cpu') def test_trashcan_python_class2(self): from _testcapi import MyList self.do_test_trashcan_python_class(MyList) def do_test_trashcan_python_class(self, base): # Check that the trashcan mechanism works properly for a Python # subclass of a class using the trashcan (this specific test assumes # that the base class "base" behaves like list) class PyList(base): # Count the number of PyList instances to verify that there is # no memory leak num = 0 def __init__(self, *args): __class__.num += 1 super().__init__(*args) def __del__(self): __class__.num -= 1 for parity in (0, 1): L = None # We need in the order of 2**20 iterations here such that a # typical 8MB stack would overflow without the trashcan. for i in range(2**20): L = PyList((L,)) L.attr = i if parity: # Add one additional nesting layer L = (L,) self.assertGreater(PyList.num, 0) del L self.assertEqual(PyList.num, 0) def test_heap_ctype_doc_and_text_signature(self): self.assertEqual(_testcapi.HeapDocCType.__doc__, "somedoc") self.assertEqual(_testcapi.HeapDocCType.__text_signature__, "(arg1, arg2)") def test_null_type_doc(self): self.assertEqual(_testcapi.NullTpDocType.__doc__, None) def test_subclass_of_heap_gc_ctype_with_tpdealloc_decrefs_once(self): class HeapGcCTypeSubclass(_testcapi.HeapGcCType): def __init__(self): self.value2 = 20 super().__init__() subclass_instance = HeapGcCTypeSubclass() type_refcnt = sys.getrefcount(HeapGcCTypeSubclass) # Test that subclass instance was fully created self.assertEqual(subclass_instance.value, 10) self.assertEqual(subclass_instance.value2, 20) # Test that the type reference count is only decremented once del subclass_instance self.assertEqual(type_refcnt - 1, sys.getrefcount(HeapGcCTypeSubclass)) def test_subclass_of_heap_gc_ctype_with_del_modifying_dunder_class_only_decrefs_once(self): class A(_testcapi.HeapGcCType): def __init__(self): self.value2 = 20 super().__init__() class B(A): def __init__(self): super().__init__() def __del__(self): self.__class__ = A A.refcnt_in_del = sys.getrefcount(A) B.refcnt_in_del = sys.getrefcount(B) subclass_instance = B() type_refcnt = sys.getrefcount(B) new_type_refcnt = sys.getrefcount(A) # Test that subclass instance was fully created self.assertEqual(subclass_instance.value, 10) self.assertEqual(subclass_instance.value2, 20) del subclass_instance # Test that setting __class__ modified the reference counts of the types if support.Py_DEBUG: # gh-89373: In debug mode, _Py_Dealloc() keeps a strong reference # to the type while calling tp_dealloc() self.assertEqual(type_refcnt, B.refcnt_in_del) else: self.assertEqual(type_refcnt - 1, B.refcnt_in_del) self.assertEqual(new_type_refcnt + 1, A.refcnt_in_del) # Test that the original type already has decreased its refcnt self.assertEqual(type_refcnt - 1, sys.getrefcount(B)) # Test that subtype_dealloc decref the newly assigned __class__ only once self.assertEqual(new_type_refcnt, sys.getrefcount(A)) def test_heaptype_with_dict(self): inst = _testcapi.HeapCTypeWithDict() inst.foo = 42 self.assertEqual(inst.foo, 42) self.assertEqual(inst.dictobj, inst.__dict__) self.assertEqual(inst.dictobj, {"foo": 42}) inst = _testcapi.HeapCTypeWithDict() self.assertEqual({}, inst.__dict__) def test_heaptype_with_managed_dict(self): inst = _testcapi.HeapCTypeWithManagedDict() inst.foo = 42 self.assertEqual(inst.foo, 42) self.assertEqual(inst.__dict__, {"foo": 42}) inst = _testcapi.HeapCTypeWithManagedDict() self.assertEqual({}, inst.__dict__) a = _testcapi.HeapCTypeWithManagedDict() b = _testcapi.HeapCTypeWithManagedDict() a.b = b b.a = a del a, b def test_sublclassing_managed_dict(self): class C(_testcapi.HeapCTypeWithManagedDict): pass i = C() i.spam = i del i def test_heaptype_with_negative_dict(self): inst = _testcapi.HeapCTypeWithNegativeDict() inst.foo = 42 self.assertEqual(inst.foo, 42) self.assertEqual(inst.dictobj, inst.__dict__) self.assertEqual(inst.dictobj, {"foo": 42}) inst = _testcapi.HeapCTypeWithNegativeDict() self.assertEqual({}, inst.__dict__) def test_heaptype_with_weakref(self): inst = _testcapi.HeapCTypeWithWeakref() ref = weakref.ref(inst) self.assertEqual(ref(), inst) self.assertEqual(inst.weakreflist, ref) def test_heaptype_with_managed_weakref(self): inst = _testcapi.HeapCTypeWithManagedWeakref() ref = weakref.ref(inst) self.assertEqual(ref(), inst) def test_sublclassing_managed_weakref(self): class C(_testcapi.HeapCTypeWithManagedWeakref): pass inst = C() ref = weakref.ref(inst) self.assertEqual(ref(), inst) def test_sublclassing_managed_both(self): class C1(_testcapi.HeapCTypeWithManagedWeakref, _testcapi.HeapCTypeWithManagedDict): pass class C2(_testcapi.HeapCTypeWithManagedDict, _testcapi.HeapCTypeWithManagedWeakref): pass for cls in (C1, C2): inst = cls() ref = weakref.ref(inst) self.assertEqual(ref(), inst) inst.spam = inst del inst ref = weakref.ref(cls()) self.assertIs(ref(), None) def test_heaptype_with_buffer(self): inst = _testcapi.HeapCTypeWithBuffer() b = bytes(inst) self.assertEqual(b, b"1234") def test_c_subclass_of_heap_ctype_with_tpdealloc_decrefs_once(self): subclass_instance = _testcapi.HeapCTypeSubclass() type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclass) # Test that subclass instance was fully created self.assertEqual(subclass_instance.value, 10) self.assertEqual(subclass_instance.value2, 20) # Test that the type reference count is only decremented once del subclass_instance self.assertEqual(type_refcnt - 1, sys.getrefcount(_testcapi.HeapCTypeSubclass)) def test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once(self): subclass_instance = _testcapi.HeapCTypeSubclassWithFinalizer() type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclassWithFinalizer) new_type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclass) # Test that subclass instance was fully created self.assertEqual(subclass_instance.value, 10) self.assertEqual(subclass_instance.value2, 20) # The tp_finalize slot will set __class__ to HeapCTypeSubclass del subclass_instance # Test that setting __class__ modified the reference counts of the types if support.Py_DEBUG: # gh-89373: In debug mode, _Py_Dealloc() keeps a strong reference # to the type while calling tp_dealloc() self.assertEqual(type_refcnt, _testcapi.HeapCTypeSubclassWithFinalizer.refcnt_in_del) else: self.assertEqual(type_refcnt - 1, _testcapi.HeapCTypeSubclassWithFinalizer.refcnt_in_del) self.assertEqual(new_type_refcnt + 1, _testcapi.HeapCTypeSubclass.refcnt_in_del) # Test that the original type already has decreased its refcnt self.assertEqual(type_refcnt - 1, sys.getrefcount(_testcapi.HeapCTypeSubclassWithFinalizer)) # Test that subtype_dealloc decref the newly assigned __class__ only once self.assertEqual(new_type_refcnt, sys.getrefcount(_testcapi.HeapCTypeSubclass)) def test_heaptype_with_setattro(self): obj = _testcapi.HeapCTypeSetattr() self.assertEqual(obj.pvalue, 10) obj.value = 12 self.assertEqual(obj.pvalue, 12) del obj.value self.assertEqual(obj.pvalue, 0) def test_heaptype_with_custom_metaclass(self): self.assertTrue(issubclass(_testcapi.HeapCTypeMetaclass, type)) self.assertTrue(issubclass(_testcapi.HeapCTypeMetaclassCustomNew, type)) t = _testcapi.pytype_fromspec_meta(_testcapi.HeapCTypeMetaclass) self.assertIsInstance(t, type) self.assertEqual(t.__name__, "HeapCTypeViaMetaclass") self.assertIs(type(t), _testcapi.HeapCTypeMetaclass) msg = "Metaclasses with custom tp_new are not supported." with self.assertRaisesRegex(TypeError, msg): t = _testcapi.pytype_fromspec_meta(_testcapi.HeapCTypeMetaclassCustomNew) def test_multiple_inheritance_ctypes_with_weakref_or_dict(self): with self.assertRaises(TypeError): class Both1(_testcapi.HeapCTypeWithWeakref, _testcapi.HeapCTypeWithDict): pass with self.assertRaises(TypeError): class Both2(_testcapi.HeapCTypeWithDict, _testcapi.HeapCTypeWithWeakref): pass def test_multiple_inheritance_ctypes_with_weakref_or_dict_and_other_builtin(self): with self.assertRaises(TypeError): class C1(_testcapi.HeapCTypeWithDict, list): pass with self.assertRaises(TypeError): class C2(_testcapi.HeapCTypeWithWeakref, list): pass class C3(_testcapi.HeapCTypeWithManagedDict, list): pass class C4(_testcapi.HeapCTypeWithManagedWeakref, list): pass inst = C3() inst.append(0) str(inst.__dict__) inst = C4() inst.append(0) str(inst.__weakref__) for cls in (_testcapi.HeapCTypeWithManagedDict, _testcapi.HeapCTypeWithManagedWeakref): for cls2 in (_testcapi.HeapCTypeWithDict, _testcapi.HeapCTypeWithWeakref): class S(cls, cls2): pass class B1(C3, cls): pass class B2(C4, cls): pass def test_pytype_fromspec_with_repeated_slots(self): for variant in range(2): with self.subTest(variant=variant): with self.assertRaises(SystemError): _testcapi.create_type_from_repeated_slots(variant) @warnings_helper.ignore_warnings(category=DeprecationWarning) def test_immutable_type_with_mutable_base(self): # Add deprecation warning here so it's removed in 3.14 warnings._deprecated( 'creating immutable classes with mutable bases', remove=(3, 14)) class MutableBase: def meth(self): return 'original' with self.assertWarns(DeprecationWarning): ImmutableSubclass = _testcapi.make_immutable_type_with_base( MutableBase) instance = ImmutableSubclass() self.assertEqual(instance.meth(), 'original') # Cannot override the static type's method with self.assertRaisesRegex( TypeError, "cannot set 'meth' attribute of immutable type"): ImmutableSubclass.meth = lambda self: 'overridden' self.assertEqual(instance.meth(), 'original') # Can change the method on the mutable base MutableBase.meth = lambda self: 'changed' self.assertEqual(instance.meth(), 'changed') def test_pynumber_tobase(self): from _testcapi import pynumber_tobase small_number = 123 large_number = 2**64 class IDX: def __init__(self, val): self.val = val def __index__(self): return self.val test_cases = ((2, '0b1111011', '0b10000000000000000000000000000000000000000000000000000000000000000'), (8, '0o173', '0o2000000000000000000000'), (10, '123', '18446744073709551616'), (16, '0x7b', '0x10000000000000000')) for base, small_target, large_target in test_cases: with self.subTest(base=base, st=small_target, lt=large_target): # Test for small number self.assertEqual(pynumber_tobase(small_number, base), small_target) self.assertEqual(pynumber_tobase(-small_number, base), '-' + small_target) self.assertEqual(pynumber_tobase(IDX(small_number), base), small_target) # Test for large number(out of range of a longlong,i.e.[-2**63, 2**63-1]) self.assertEqual(pynumber_tobase(large_number, base), large_target) self.assertEqual(pynumber_tobase(-large_number, base), '-' + large_target) self.assertEqual(pynumber_tobase(IDX(large_number), base), large_target) self.assertRaises(TypeError, pynumber_tobase, IDX(123.0), 10) self.assertRaises(TypeError, pynumber_tobase, IDX('123'), 10) self.assertRaises(TypeError, pynumber_tobase, 123.0, 10) self.assertRaises(TypeError, pynumber_tobase, '123', 10) self.assertRaises(SystemError, pynumber_tobase, 123, 0) def check_fatal_error(self, code, expected, not_expected=()): with support.SuppressCrashReport(): rc, out, err = assert_python_failure('-sSI', '-c', code) err = decode_stderr(err) self.assertIn('Fatal Python error: test_fatal_error: MESSAGE\n', err) match = re.search(r'^Extension modules:(.*) \(total: ([0-9]+)\)$', err, re.MULTILINE) if not match: self.fail(f"Cannot find 'Extension modules:' in {err!r}") modules = set(match.group(1).strip().split(', ')) total = int(match.group(2)) for name in expected: self.assertIn(name, modules) for name in not_expected: self.assertNotIn(name, modules) self.assertEqual(len(modules), total) @support.requires_subprocess() def test_fatal_error(self): # By default, stdlib extension modules are ignored, # but not test modules. expected = ('_testcapi',) not_expected = ('sys',) code = 'import _testcapi, sys; _testcapi.fatal_error(b"MESSAGE")' self.check_fatal_error(code, expected, not_expected) # Mark _testcapi as stdlib module, but not sys expected = ('sys',) not_expected = ('_testcapi',) code = textwrap.dedent(''' import _testcapi, sys sys.stdlib_module_names = frozenset({"_testcapi"}) _testcapi.fatal_error(b"MESSAGE") ''') self.check_fatal_error(code, expected) def test_pyobject_repr_from_null(self): s = _testcapi.pyobject_repr_from_null() self.assertEqual(s, '') def test_pyobject_str_from_null(self): s = _testcapi.pyobject_str_from_null() self.assertEqual(s, '') def test_pyobject_bytes_from_null(self): s = _testcapi.pyobject_bytes_from_null() self.assertEqual(s, b'') def test_Py_CompileString(self): # Check that Py_CompileString respects the coding cookie _compile = _testcapi.Py_CompileString code = b"# -*- coding: latin1 -*-\nprint('\xc2\xa4')\n" result = _compile(code) expected = compile(code, "", "exec") self.assertEqual(result.co_consts, expected.co_consts) def test_export_symbols(self): # bpo-44133: Ensure that the "Py_FrozenMain" and # "PyThread_get_thread_native_id" symbols are exported by the Python # (directly by the binary, or via by the Python dynamic library). ctypes = import_helper.import_module('ctypes') names = [] # Test if the PY_HAVE_THREAD_NATIVE_ID macro is defined if hasattr(_thread, 'get_native_id'): names.append('PyThread_get_thread_native_id') # Python/frozenmain.c fails to build on Windows when the symbols are # missing: # - PyWinFreeze_ExeInit # - PyWinFreeze_ExeTerm # - PyInitFrozenExtensions if os.name != 'nt': names.append('Py_FrozenMain') for name in names: with self.subTest(name=name): self.assertTrue(hasattr(ctypes.pythonapi, name)) def test_clear_managed_dict(self): class C: def __init__(self): self.a = 1 c = C() _testcapi.clear_managed_dict(c) self.assertEqual(c.__dict__, {}) c = C() self.assertEqual(c.__dict__, {'a':1}) _testcapi.clear_managed_dict(c) self.assertEqual(c.__dict__, {}) def test_eval_get_func_name(self): def function_example(): ... class A: def method_example(self): ... self.assertEqual(_testcapi.eval_get_func_name(function_example), "function_example") self.assertEqual(_testcapi.eval_get_func_name(A.method_example), "method_example") self.assertEqual(_testcapi.eval_get_func_name(A().method_example), "method_example") self.assertEqual(_testcapi.eval_get_func_name(sum), "sum") # c function self.assertEqual(_testcapi.eval_get_func_name(A), "type") def test_function_get_code(self): import types def some(): pass code = _testcapi.function_get_code(some) self.assertIsInstance(code, types.CodeType) self.assertEqual(code, some.__code__) with self.assertRaises(SystemError): _testcapi.function_get_code(None) # not a function def test_function_get_globals(self): def some(): pass globals_ = _testcapi.function_get_globals(some) self.assertIsInstance(globals_, dict) self.assertEqual(globals_, some.__globals__) with self.assertRaises(SystemError): _testcapi.function_get_globals(None) # not a function def test_function_get_module(self): def some(): pass module = _testcapi.function_get_module(some) self.assertIsInstance(module, str) self.assertEqual(module, some.__module__) with self.assertRaises(SystemError): _testcapi.function_get_module(None) # not a function class TestPendingCalls(unittest.TestCase): def pendingcalls_submit(self, l, n): def callback(): #this function can be interrupted by thread switching so let's #use an atomic operation l.append(None) for i in range(n): time.sleep(random.random()*0.02) #0.01 secs on average #try submitting callback until successful. #rely on regular interrupt to flush queue if we are #unsuccessful. while True: if _testcapi._pending_threadfunc(callback): break def pendingcalls_wait(self, l, n, context = None): #now, stick around until l[0] has grown to 10 count = 0 while len(l) != n: #this busy loop is where we expect to be interrupted to #run our callbacks. Note that callbacks are only run on the #main thread if False and support.verbose: print("(%i)"%(len(l),),) for i in range(1000): a = i*i if context and not context.event.is_set(): continue count += 1 self.assertTrue(count < 10000, "timeout waiting for %i callbacks, got %i"%(n, len(l))) if False and support.verbose: print("(%i)"%(len(l),)) @threading_helper.requires_working_threading() def test_pendingcalls_threaded(self): #do every callback on a separate thread n = 32 #total callbacks threads = [] class foo(object):pass context = foo() context.l = [] context.n = 2 #submits per thread context.nThreads = n // context.n context.nFinished = 0 context.lock = threading.Lock() context.event = threading.Event() threads = [threading.Thread(target=self.pendingcalls_thread, args=(context,)) for i in range(context.nThreads)] with threading_helper.start_threads(threads): self.pendingcalls_wait(context.l, n, context) def pendingcalls_thread(self, context): try: self.pendingcalls_submit(context.l, context.n) finally: with context.lock: context.nFinished += 1 nFinished = context.nFinished if False and support.verbose: print("finished threads: ", nFinished) if nFinished == context.nThreads: context.event.set() def test_pendingcalls_non_threaded(self): #again, just using the main thread, likely they will all be dispatched at #once. It is ok to ask for too many, because we loop until we find a slot. #the loop can be interrupted to dispatch. #there are only 32 dispatch slots, so we go for twice that! l = [] n = 64 self.pendingcalls_submit(l, n) self.pendingcalls_wait(l, n) class SubinterpreterTest(unittest.TestCase): @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()") def test_subinterps(self): import builtins r, w = os.pipe() code = """if 1: import sys, builtins, pickle with open({:d}, "wb") as f: pickle.dump(id(sys.modules), f) pickle.dump(id(builtins), f) """.format(w) with open(r, "rb") as f: ret = support.run_in_subinterp(code) self.assertEqual(ret, 0) self.assertNotEqual(pickle.load(f), id(sys.modules)) self.assertNotEqual(pickle.load(f), id(builtins)) @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()") def test_subinterps_recent_language_features(self): r, w = os.pipe() code = """if 1: import pickle with open({:d}, "wb") as f: @(lambda x:x) # Py 3.9 def noop(x): return x a = (b := f'1{{2}}3') + noop('x') # Py 3.8 (:=) / 3.6 (f'') async def foo(arg): return await arg # Py 3.5 pickle.dump(dict(a=a, b=b), f) """.format(w) with open(r, "rb") as f: ret = support.run_in_subinterp(code) self.assertEqual(ret, 0) self.assertEqual(pickle.load(f), {'a': '123x', 'b': '123'}) def test_py_config_isoloated_per_interpreter(self): # A config change in one interpreter must not leak to out to others. # # This test could verify ANY config value, it just happens to have been # written around the time of int_max_str_digits. Refactoring is okay. code = """if 1: import sys, _testinternalcapi # Any config value would do, this happens to be the one being # double checked at the time this test was written. config = _testinternalcapi.get_config() config['int_max_str_digits'] = 55555 _testinternalcapi.set_config(config) sub_value = _testinternalcapi.get_config()['int_max_str_digits'] assert sub_value == 55555, sub_value """ before_config = _testinternalcapi.get_config() assert before_config['int_max_str_digits'] != 55555 self.assertEqual(support.run_in_subinterp(code), 0, 'subinterp code failure, check stderr.') after_config = _testinternalcapi.get_config() self.assertIsNot( before_config, after_config, "Expected get_config() to return a new dict on each call") self.assertEqual(before_config, after_config, "CAUTION: Tests executed after this may be " "running under an altered config.") # try:...finally: calling set_config(before_config) not done # as that results in sys.argv, sys.path, and sys.warnoptions # "being modified by test_capi" per test.regrtest. So if this # test fails, assume that the environment in this process may # be altered and suspect. def test_mutate_exception(self): """ Exceptions saved in global module state get shared between individual module instances. This test checks whether or not a change in one interpreter's module gets reflected into the other ones. """ import binascii support.run_in_subinterp("import binascii; binascii.Error.foobar = 'foobar'") self.assertFalse(hasattr(binascii.Error, "foobar")) @unittest.skipIf(_testmultiphase is None, "test requires _testmultiphase module") def test_module_state_shared_in_global(self): """ bpo-44050: Extension module state should be shared between interpreters when it doesn't support sub-interpreters. """ r, w = os.pipe() self.addCleanup(os.close, r) self.addCleanup(os.close, w) script = textwrap.dedent(f""" import importlib.machinery import importlib.util import os fullname = '_test_module_state_shared' origin = importlib.util.find_spec('_testmultiphase').origin loader = importlib.machinery.ExtensionFileLoader(fullname, origin) spec = importlib.util.spec_from_loader(fullname, loader) module = importlib.util.module_from_spec(spec) attr_id = str(id(module.Error)).encode() os.write({w}, attr_id) """) exec(script) main_attr_id = os.read(r, 100) ret = support.run_in_subinterp(script) self.assertEqual(ret, 0) subinterp_attr_id = os.read(r, 100) self.assertEqual(main_attr_id, subinterp_attr_id) class TestThreadState(unittest.TestCase): @threading_helper.reap_threads @threading_helper.requires_working_threading() def test_thread_state(self): # some extra thread-state tests driven via _testcapi def target(): idents = [] def callback(): idents.append(threading.get_ident()) _testcapi._test_thread_state(callback) a = b = callback time.sleep(1) # Check our main thread is in the list exactly 3 times. self.assertEqual(idents.count(threading.get_ident()), 3, "Couldn't find main thread correctly in the list") target() t = threading.Thread(target=target) t.start() t.join() @threading_helper.reap_threads @threading_helper.requires_working_threading() def test_gilstate_ensure_no_deadlock(self): # See https://github.com/python/cpython/issues/96071 code = textwrap.dedent(f""" import _testcapi def callback(): print('callback called') _testcapi._test_thread_state(callback) """) ret = assert_python_ok('-X', 'tracemalloc', '-c', code) self.assertIn(b'callback called', ret.out) class Test_testcapi(unittest.TestCase): locals().update((name, getattr(_testcapi, name)) for name in dir(_testcapi) if name.startswith('test_') and not name.endswith('_code')) # Suppress warning from PyUnicode_FromUnicode(). @warnings_helper.ignore_warnings(category=DeprecationWarning) def test_widechar(self): _testcapi.test_widechar() def test_version_api_data(self): self.assertEqual(_testcapi.Py_Version, sys.hexversion) class Test_testinternalcapi(unittest.TestCase): locals().update((name, getattr(_testinternalcapi, name)) for name in dir(_testinternalcapi) if name.startswith('test_')) @support.requires_subprocess() class PyMemDebugTests(unittest.TestCase): PYTHONMALLOC = 'debug' # '0x04c06e0' or '04C06E0' PTR_REGEX = r'(?:0x)?[0-9a-fA-F]+' def check(self, code): with support.SuppressCrashReport(): out = assert_python_failure( '-c', code, PYTHONMALLOC=self.PYTHONMALLOC, # FreeBSD: instruct jemalloc to not fill freed() memory # with junk byte 0x5a, see JEMALLOC(3) MALLOC_CONF="junk:false", ) stderr = out.err return stderr.decode('ascii', 'replace') def test_buffer_overflow(self): out = self.check('import _testcapi; _testcapi.pymem_buffer_overflow()') regex = (r"Debug memory block at address p={ptr}: API 'm'\n" r" 16 bytes originally requested\n" r" The [0-9] pad bytes at p-[0-9] are FORBIDDENBYTE, as expected.\n" r" The [0-9] pad bytes at tail={ptr} are not all FORBIDDENBYTE \(0x[0-9a-f]{{2}}\):\n" r" at tail\+0: 0x78 \*\*\* OUCH\n" r" at tail\+1: 0xfd\n" r" at tail\+2: 0xfd\n" r" .*\n" r"( The block was made by call #[0-9]+ to debug malloc/realloc.\n)?" r" Data at p: cd cd cd .*\n" r"\n" r"Enable tracemalloc to get the memory block allocation traceback\n" r"\n" r"Fatal Python error: _PyMem_DebugRawFree: bad trailing pad byte") regex = regex.format(ptr=self.PTR_REGEX) regex = re.compile(regex, flags=re.DOTALL) self.assertRegex(out, regex) def test_api_misuse(self): out = self.check('import _testcapi; _testcapi.pymem_api_misuse()') regex = (r"Debug memory block at address p={ptr}: API 'm'\n" r" 16 bytes originally requested\n" r" The [0-9] pad bytes at p-[0-9] are FORBIDDENBYTE, as expected.\n" r" The [0-9] pad bytes at tail={ptr} are FORBIDDENBYTE, as expected.\n" r"( The block was made by call #[0-9]+ to debug malloc/realloc.\n)?" r" Data at p: cd cd cd .*\n" r"\n" r"Enable tracemalloc to get the memory block allocation traceback\n" r"\n" r"Fatal Python error: _PyMem_DebugRawFree: bad ID: Allocated using API 'm', verified using API 'r'\n") regex = regex.format(ptr=self.PTR_REGEX) self.assertRegex(out, regex) def check_malloc_without_gil(self, code): out = self.check(code) expected = ('Fatal Python error: _PyMem_DebugMalloc: ' 'Python memory allocator called without holding the GIL') self.assertIn(expected, out) def test_pymem_malloc_without_gil(self): # Debug hooks must raise an error if PyMem_Malloc() is called # without holding the GIL code = 'import _testcapi; _testcapi.pymem_malloc_without_gil()' self.check_malloc_without_gil(code) def test_pyobject_malloc_without_gil(self): # Debug hooks must raise an error if PyObject_Malloc() is called # without holding the GIL code = 'import _testcapi; _testcapi.pyobject_malloc_without_gil()' self.check_malloc_without_gil(code) def check_pyobject_is_freed(self, func_name): code = textwrap.dedent(f''' import gc, os, sys, _testcapi # Disable the GC to avoid crash on GC collection gc.disable() try: _testcapi.{func_name}() # Exit immediately to avoid a crash while deallocating # the invalid object os._exit(0) except _testcapi.error: os._exit(1) ''') assert_python_ok( '-c', code, PYTHONMALLOC=self.PYTHONMALLOC, MALLOC_CONF="junk:false", ) def test_pyobject_null_is_freed(self): self.check_pyobject_is_freed('check_pyobject_null_is_freed') def test_pyobject_uninitialized_is_freed(self): self.check_pyobject_is_freed('check_pyobject_uninitialized_is_freed') def test_pyobject_forbidden_bytes_is_freed(self): self.check_pyobject_is_freed('check_pyobject_forbidden_bytes_is_freed') def test_pyobject_freed_is_freed(self): self.check_pyobject_is_freed('check_pyobject_freed_is_freed') class PyMemMallocDebugTests(PyMemDebugTests): PYTHONMALLOC = 'malloc_debug' @unittest.skipUnless(support.with_pymalloc(), 'need pymalloc') class PyMemPymallocDebugTests(PyMemDebugTests): PYTHONMALLOC = 'pymalloc_debug' @unittest.skipUnless(support.Py_DEBUG, 'need Py_DEBUG') class PyMemDefaultTests(PyMemDebugTests): # test default allocator of Python compiled in debug mode PYTHONMALLOC = '' @unittest.skipIf(_testmultiphase is None, "test requires _testmultiphase module") class Test_ModuleStateAccess(unittest.TestCase): """Test access to module start (PEP 573)""" # The C part of the tests lives in _testmultiphase, in a module called # _testmultiphase_meth_state_access. # This module has multi-phase initialization, unlike _testcapi. def setUp(self): fullname = '_testmultiphase_meth_state_access' # XXX origin = importlib.util.find_spec('_testmultiphase').origin loader = importlib.machinery.ExtensionFileLoader(fullname, origin) spec = importlib.util.spec_from_loader(fullname, loader) module = importlib.util.module_from_spec(spec) loader.exec_module(module) self.module = module def test_subclass_get_module(self): """PyType_GetModule for defining_class""" class StateAccessType_Subclass(self.module.StateAccessType): pass instance = StateAccessType_Subclass() self.assertIs(instance.get_defining_module(), self.module) def test_subclass_get_module_with_super(self): class StateAccessType_Subclass(self.module.StateAccessType): def get_defining_module(self): return super().get_defining_module() instance = StateAccessType_Subclass() self.assertIs(instance.get_defining_module(), self.module) def test_state_access(self): """Checks methods defined with and without argument clinic This tests a no-arg method (get_count) and a method with both a positional and keyword argument. """ a = self.module.StateAccessType() b = self.module.StateAccessType() methods = { 'clinic': a.increment_count_clinic, 'noclinic': a.increment_count_noclinic, } for name, increment_count in methods.items(): with self.subTest(name): self.assertEqual(a.get_count(), b.get_count()) self.assertEqual(a.get_count(), 0) increment_count() self.assertEqual(a.get_count(), b.get_count()) self.assertEqual(a.get_count(), 1) increment_count(3) self.assertEqual(a.get_count(), b.get_count()) self.assertEqual(a.get_count(), 4) increment_count(-2, twice=True) self.assertEqual(a.get_count(), b.get_count()) self.assertEqual(a.get_count(), 0) with self.assertRaises(TypeError): increment_count(thrice=3) with self.assertRaises(TypeError): increment_count(1, 2, 3) def test_get_module_bad_def(self): # PyType_GetModuleByDef fails gracefully if it doesn't # find what it's looking for. # see bpo-46433 instance = self.module.StateAccessType() with self.assertRaises(TypeError): instance.getmodulebydef_bad_def() def test_get_module_static_in_mro(self): # Here, the class PyType_GetModuleByDef is looking for # appears in the MRO after a static type (Exception). # see bpo-46433 class Subclass(BaseException, self.module.StateAccessType): pass self.assertIs(Subclass().get_defining_module(), self.module) class Test_FrameAPI(unittest.TestCase): def getframe(self): return sys._getframe() def getgenframe(self): yield sys._getframe() def test_frame_getters(self): frame = self.getframe() self.assertEqual(frame.f_locals, _testcapi.frame_getlocals(frame)) self.assertIs(frame.f_globals, _testcapi.frame_getglobals(frame)) self.assertIs(frame.f_builtins, _testcapi.frame_getbuiltins(frame)) self.assertEqual(frame.f_lasti, _testcapi.frame_getlasti(frame)) def test_frame_get_generator(self): gen = self.getgenframe() frame = next(gen) self.assertIs(gen, _testcapi.frame_getgenerator(frame)) SUFFICIENT_TO_DEOPT_AND_SPECIALIZE = 100 class Test_Pep523API(unittest.TestCase): def do_test(self, func): calls = [] start = SUFFICIENT_TO_DEOPT_AND_SPECIALIZE count = start + SUFFICIENT_TO_DEOPT_AND_SPECIALIZE for i in range(count): if i == start: _testinternalcapi.set_eval_frame_record(calls) func() _testinternalcapi.set_eval_frame_default() self.assertEqual(len(calls), SUFFICIENT_TO_DEOPT_AND_SPECIALIZE) for name in calls: self.assertEqual(name, func.__name__) def test_pep523_with_specialization_simple(self): def func1(): pass self.do_test(func1) def test_pep523_with_specialization_with_default(self): def func2(x=None): pass self.do_test(func2) class TestDictWatchers(unittest.TestCase): # types of watchers testcapimodule can add: EVENTS = 0 # appends dict events as strings to global event list ERROR = 1 # unconditionally sets and signals a RuntimeException SECOND = 2 # always appends "second" to global event list def add_watcher(self, kind=EVENTS): return _testcapi.add_dict_watcher(kind) def clear_watcher(self, watcher_id): _testcapi.clear_dict_watcher(watcher_id) @contextmanager def watcher(self, kind=EVENTS): wid = self.add_watcher(kind) try: yield wid finally: self.clear_watcher(wid) def assert_events(self, expected): actual = _testcapi.get_dict_watcher_events() self.assertEqual(actual, expected) def watch(self, wid, d): _testcapi.watch_dict(wid, d) def unwatch(self, wid, d): _testcapi.unwatch_dict(wid, d) def test_set_new_item(self): d = {} with self.watcher() as wid: self.watch(wid, d) d["foo"] = "bar" self.assert_events(["new:foo:bar"]) def test_set_existing_item(self): d = {"foo": "bar"} with self.watcher() as wid: self.watch(wid, d) d["foo"] = "baz" self.assert_events(["mod:foo:baz"]) def test_clone(self): d = {} d2 = {"foo": "bar"} with self.watcher() as wid: self.watch(wid, d) d.update(d2) self.assert_events(["clone"]) def test_no_event_if_not_watched(self): d = {} with self.watcher() as wid: d["foo"] = "bar" self.assert_events([]) def test_del(self): d = {"foo": "bar"} with self.watcher() as wid: self.watch(wid, d) del d["foo"] self.assert_events(["del:foo"]) def test_pop(self): d = {"foo": "bar"} with self.watcher() as wid: self.watch(wid, d) d.pop("foo") self.assert_events(["del:foo"]) def test_clear(self): d = {"foo": "bar"} with self.watcher() as wid: self.watch(wid, d) d.clear() self.assert_events(["clear"]) def test_dealloc(self): d = {"foo": "bar"} with self.watcher() as wid: self.watch(wid, d) del d self.assert_events(["dealloc"]) def test_unwatch(self): d = {} with self.watcher() as wid: self.watch(wid, d) d["foo"] = "bar" self.unwatch(wid, d) d["hmm"] = "baz" self.assert_events(["new:foo:bar"]) def test_error(self): d = {} with self.watcher(kind=self.ERROR) as wid: self.watch(wid, d) with catch_unraisable_exception() as cm: d["foo"] = "bar" self.assertIs(cm.unraisable.object, d) self.assertEqual(str(cm.unraisable.exc_value), "boom!") self.assert_events([]) def test_two_watchers(self): d1 = {} d2 = {} with self.watcher() as wid1: with self.watcher(kind=self.SECOND) as wid2: self.watch(wid1, d1) self.watch(wid2, d2) d1["foo"] = "bar" d2["hmm"] = "baz" self.assert_events(["new:foo:bar", "second"]) def test_watch_non_dict(self): with self.watcher() as wid: with self.assertRaisesRegex(ValueError, r"Cannot watch non-dictionary"): self.watch(wid, 1) def test_watch_out_of_range_watcher_id(self): d = {} with self.assertRaisesRegex(ValueError, r"Invalid dict watcher ID -1"): self.watch(-1, d) with self.assertRaisesRegex(ValueError, r"Invalid dict watcher ID 8"): self.watch(8, d) # DICT_MAX_WATCHERS = 8 def test_watch_unassigned_watcher_id(self): d = {} with self.assertRaisesRegex(ValueError, r"No dict watcher set for ID 1"): self.watch(1, d) def test_unwatch_non_dict(self): with self.watcher() as wid: with self.assertRaisesRegex(ValueError, r"Cannot watch non-dictionary"): self.unwatch(wid, 1) def test_unwatch_out_of_range_watcher_id(self): d = {} with self.assertRaisesRegex(ValueError, r"Invalid dict watcher ID -1"): self.unwatch(-1, d) with self.assertRaisesRegex(ValueError, r"Invalid dict watcher ID 8"): self.unwatch(8, d) # DICT_MAX_WATCHERS = 8 def test_unwatch_unassigned_watcher_id(self): d = {} with self.assertRaisesRegex(ValueError, r"No dict watcher set for ID 1"): self.unwatch(1, d) def test_clear_out_of_range_watcher_id(self): with self.assertRaisesRegex(ValueError, r"Invalid dict watcher ID -1"): self.clear_watcher(-1) with self.assertRaisesRegex(ValueError, r"Invalid dict watcher ID 8"): self.clear_watcher(8) # DICT_MAX_WATCHERS = 8 def test_clear_unassigned_watcher_id(self): with self.assertRaisesRegex(ValueError, r"No dict watcher set for ID 1"): self.clear_watcher(1) class TestTypeWatchers(unittest.TestCase): # types of watchers testcapimodule can add: TYPES = 0 # appends modified types to global event list ERROR = 1 # unconditionally sets and signals a RuntimeException WRAP = 2 # appends modified type wrapped in list to global event list # duplicating the C constant TYPE_MAX_WATCHERS = 8 def add_watcher(self, kind=TYPES): return _testcapi.add_type_watcher(kind) def clear_watcher(self, watcher_id): _testcapi.clear_type_watcher(watcher_id) @contextmanager def watcher(self, kind=TYPES): wid = self.add_watcher(kind) try: yield wid finally: self.clear_watcher(wid) def assert_events(self, expected): actual = _testcapi.get_type_modified_events() self.assertEqual(actual, expected) def watch(self, wid, t): _testcapi.watch_type(wid, t) def unwatch(self, wid, t): _testcapi.unwatch_type(wid, t) def test_watch_type(self): class C: pass with self.watcher() as wid: self.watch(wid, C) C.foo = "bar" self.assert_events([C]) def test_event_aggregation(self): class C: pass with self.watcher() as wid: self.watch(wid, C) C.foo = "bar" C.bar = "baz" # only one event registered for both modifications self.assert_events([C]) def test_lookup_resets_aggregation(self): class C: pass with self.watcher() as wid: self.watch(wid, C) C.foo = "bar" # lookup resets type version tag self.assertEqual(C.foo, "bar") C.bar = "baz" # both events registered self.assert_events([C, C]) def test_unwatch_type(self): class C: pass with self.watcher() as wid: self.watch(wid, C) C.foo = "bar" self.assertEqual(C.foo, "bar") self.assert_events([C]) self.unwatch(wid, C) C.bar = "baz" self.assert_events([C]) def test_clear_watcher(self): class C: pass # outer watcher is unused, it's just to keep events list alive with self.watcher() as _: with self.watcher() as wid: self.watch(wid, C) C.foo = "bar" self.assertEqual(C.foo, "bar") self.assert_events([C]) C.bar = "baz" # Watcher on C has been cleared, no new event self.assert_events([C]) def test_watch_type_subclass(self): class C: pass class D(C): pass with self.watcher() as wid: self.watch(wid, D) C.foo = "bar" self.assert_events([D]) def test_error(self): class C: pass with self.watcher(kind=self.ERROR) as wid: self.watch(wid, C) with catch_unraisable_exception() as cm: C.foo = "bar" self.assertIs(cm.unraisable.object, C) self.assertEqual(str(cm.unraisable.exc_value), "boom!") self.assert_events([]) def test_two_watchers(self): class C1: pass class C2: pass with self.watcher() as wid1: with self.watcher(kind=self.WRAP) as wid2: self.assertNotEqual(wid1, wid2) self.watch(wid1, C1) self.watch(wid2, C2) C1.foo = "bar" C2.hmm = "baz" self.assert_events([C1, [C2]]) def test_watch_non_type(self): with self.watcher() as wid: with self.assertRaisesRegex(ValueError, r"Cannot watch non-type"): self.watch(wid, 1) def test_watch_out_of_range_watcher_id(self): class C: pass with self.assertRaisesRegex(ValueError, r"Invalid type watcher ID -1"): self.watch(-1, C) with self.assertRaisesRegex(ValueError, r"Invalid type watcher ID 8"): self.watch(self.TYPE_MAX_WATCHERS, C) def test_watch_unassigned_watcher_id(self): class C: pass with self.assertRaisesRegex(ValueError, r"No type watcher set for ID 1"): self.watch(1, C) def test_unwatch_non_type(self): with self.watcher() as wid: with self.assertRaisesRegex(ValueError, r"Cannot watch non-type"): self.unwatch(wid, 1) def test_unwatch_out_of_range_watcher_id(self): class C: pass with self.assertRaisesRegex(ValueError, r"Invalid type watcher ID -1"): self.unwatch(-1, C) with self.assertRaisesRegex(ValueError, r"Invalid type watcher ID 8"): self.unwatch(self.TYPE_MAX_WATCHERS, C) def test_unwatch_unassigned_watcher_id(self): class C: pass with self.assertRaisesRegex(ValueError, r"No type watcher set for ID 1"): self.unwatch(1, C) def test_clear_out_of_range_watcher_id(self): with self.assertRaisesRegex(ValueError, r"Invalid type watcher ID -1"): self.clear_watcher(-1) with self.assertRaisesRegex(ValueError, r"Invalid type watcher ID 8"): self.clear_watcher(self.TYPE_MAX_WATCHERS) def test_clear_unassigned_watcher_id(self): with self.assertRaisesRegex(ValueError, r"No type watcher set for ID 1"): self.clear_watcher(1) def test_no_more_ids_available(self): contexts = [self.watcher() for i in range(self.TYPE_MAX_WATCHERS)] with ExitStack() as stack: for ctx in contexts: stack.enter_context(ctx) with self.assertRaisesRegex(RuntimeError, r"no more type watcher IDs"): self.add_watcher() if __name__ == "__main__": unittest.main()