248 lines
7.7 KiB
Python
248 lines
7.7 KiB
Python
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"""PyO3 #[pyclass(subclass)] 子类化兼容性测试 Mixin。
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验证: Python 端可以正常子类化 PyO3 导出的类，__new__/__init__ 协作、
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super() 委托、MRO 链、property/method 重写等全部正确。
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用法::
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class TestMyObserver(PyO3SubclassMixin, unittest.TestCase):
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base_class = mylib.Observer
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constructor_args = ("symbol", 300)
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constructor_kwargs = {}
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# 可选: 用 kwargs 的构造
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constructor_with_config = ("symbol", 300, {"配置": mylib.Config()})
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# 可选: 序列 getter 名称列表（重写测试会检查这些 getter 可被覆盖）
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sequence_getter_names = [
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"普通K线序列", "高级序列",
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]
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# 可选: 需要 .nb 数据文件才能运行的测试会检查这个
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@staticmethod
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def has_data_file():
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return os.path.isfile("data.nb")
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# 可选: 创建一个"喂了一根K线"的 target
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@staticmethod
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def make_target_with_data():
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obs = mylib.Observer("sym", 300)
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k = mylib.KLine(...)
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obs.feed(k)
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return obs
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# 可选: 创建一个"喂了一根K线"的子类实例
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@staticmethod
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def make_sub_with_data():
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class Sub(mylib.Observer):
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pass
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obs = Sub("sym", 300)
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k = mylib.KLine(...)
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obs.feed(k)
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return obs
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"""
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import unittest
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class PyO3SubclassMixin:
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"""PyO3 子类化兼容性测试 Mixin。
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子类必须定义:
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base_class: type
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constructor_args: tuple
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constructor_kwargs: dict
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子类可选定义:
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sequence_getter_names: list[str]
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has_data_file: Callable[[], bool]
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make_target_with_data: Callable[[], Any]
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make_sub_with_data: Callable[[], Any]
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make_data_item: Callable[[], Any] # 创建一根可喂入的数据项
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feed_method_name: str # 喂数据的方法名，默认 "增加原始K线"
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property_getters: list[str] # 需要逐一下覆写的 property 名
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method_overrides: list[str] # 需要逐一重写的方法名
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"""
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base_class: type = None
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constructor_args: tuple = ()
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constructor_kwargs: dict = {}
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sequence_getter_names: list = []
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# 可选 hooks
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has_data_file = None
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make_target_with_data = None
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make_sub_with_data = None
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make_data_item = None
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feed_method_name = "增加原始K线"
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property_getters: list = []
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method_overrides: list = []
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@classmethod
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def setUpClass(cls):
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if cls.base_class is None:
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raise unittest.SkipTest(f"{cls.__name__} 未定义 base_class")
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# ---- 基础子类化 ----
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def test_子类可实例化(self):
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"""子类可创建，isinstance 正确."""
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Base = self.base_class
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class Sub(Base):
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pass
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obs = Sub(*self.constructor_args, **self.constructor_kwargs)
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self.assertIsInstance(obs, Base)
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self.assertEqual(type(obs).__name__, "Sub")
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def test_子类_init_可添加自定义属性(self):
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"""子类 __init__ 可添加自定义属性，基类字段不受影响."""
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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class Sub(Base):
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def __init__(self, *a, **kw):
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self.tag = "custom"
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self.count = 0
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obs = Sub(*args, **kwargs)
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self.assertEqual(obs.tag, "custom")
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self.assertEqual(obs.count, 0)
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def test_子类_new_过滤_kwargs(self):
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"""__new__ 过滤子类专属参数，只把父类需要的传给 super().__new__."""
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Base = self.base_class
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args = self.constructor_args
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class Sub(Base):
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def __new__(cls, *a, extra=None, **kw):
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return super().__new__(cls, *a)
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def __init__(self, *a, extra=None, **kw):
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self.extra = extra
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obs = Sub(*args, extra={"debug": True})
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self.assertEqual(obs.extra, {"debug": True})
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obs2 = Sub(*args)
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self.assertIsNone(obs2.extra)
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# ---- 方法重写 ----
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def test_方法重写_super调用(self):
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"""重写方法，super() 调用父类."""
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if self.make_target_with_data is None or self.make_sub_with_data is None:
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self.skipTest("未定义 make_target_with_data / make_sub_with_data")
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base_obs = self.make_target_with_data()
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sub_obs = self.make_sub_with_data()
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for attr in self.sequence_getter_names:
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base_len = len(getattr(base_obs, attr))
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sub_len = len(getattr(sub_obs, attr))
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self.assertEqual(base_len, sub_len, f"{attr}: base={base_len}, sub={sub_len}")
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def test_方法完全重写不调super(self):
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"""完全重写方法不调 super()，基类逻辑不执行."""
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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class Sub(Base):
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def __init__(self, *a, **kw):
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self.log = []
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obs = Sub(*args, **kwargs)
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self.assertEqual(obs.log, [])
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# ---- property 重写 ----
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def test_property_重写_super调用(self):
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"""重写 @property getter，super() 取基类值."""
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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class Sub(Base):
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pass
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obs = Sub(*args, **kwargs)
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# 验证实例创建成功即可，具体 getter 覆盖由子类测试
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self.assertIsInstance(obs, Base)
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def test_str_repr_重写(self):
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"""重写 __str__ / __repr__."""
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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class Sub(Base):
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def __str__(self):
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return f"Custom({id(self)})"
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def __repr__(self):
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return self.__str__()
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obs = Sub(*args, **kwargs)
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self.assertIn("Custom", str(obs))
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self.assertEqual(str(obs), repr(obs))
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# ---- 多层继承 MRO ----
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def test_多层继承_MRO链完整(self):
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"""多层继承，MRO 调用链完整."""
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if self.make_data_item is None:
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self.skipTest("未定义 make_data_item")
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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feed_name = self.feed_method_name
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class L1(Base):
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def __init__(self, *a, **kw):
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self._l1_called = False
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class L2(L1):
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def __init__(self, *a, **kw):
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super().__init__(*a, **kw)
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self._l2_called = True
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obs = L2(*args, **kwargs)
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self.assertTrue(obs._l2_called)
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def test_未重写方法直接继承(self):
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"""未重写的方法从基类直接继承."""
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if self.make_data_item is None:
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self.skipTest("未定义 make_data_item")
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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class Sub(Base):
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pass
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obs = Sub(*args, **kwargs)
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self.assertIsInstance(obs, Base)
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# ---- 重写后实例行为与基类一致 ----
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def test_同名继承行为一致(self):
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"""同名继承（零重写），行为与基类完全一致."""
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if self.make_target_with_data is None:
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self.skipTest("未定义 make_target_with_data")
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Base = self.base_class
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args = self.constructor_args
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kwargs = self.constructor_kwargs
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class Sub(Base):
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pass
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base = Base(*args, **kwargs)
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sub = Sub(*args, **kwargs)
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self.assertIsInstance(sub, Base)
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