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124 lines
4.2 KiB
Python
124 lines
4.2 KiB
Python
import pytest
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from app.foundation.singleton import Singleton, SingletonClass, WeakSingleton
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def test_singleton_class_can_read_existing_instance_without_creating(monkeypatch):
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"""按类单例可以只读取已存在实例"""
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class Example(metaclass=SingletonClass):
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pass
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monkeypatch.setattr(SingletonClass, "_instances", {})
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assert Example.get_existing_instance() is None
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instance = Example()
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assert Example.get_existing_instance() is instance
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def test_parameterized_singleton_can_read_matching_instance_without_creating(monkeypatch):
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"""参数化单例按相同参数读取已存在实例"""
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class Example(metaclass=Singleton):
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def __init__(self, name):
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self.name = name
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monkeypatch.setattr(Singleton, "_instances", {})
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assert Example.get_existing_instance("first") is None
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instance = Example("first")
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assert Example.get_existing_instance("first") is instance
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assert Example.get_existing_instance("second") is None
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def test_parameterized_singleton_releases_only_matching_owner(monkeypatch):
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"""迟到的旧 owner 不得释放同类当前已发布的新 owner。"""
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class Example(metaclass=Singleton):
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"""用于验证按参数单例 owner 身份。"""
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monkeypatch.setattr(Singleton, "_instances", {})
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current = Example()
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assert Example.release_existing_instance(object()) is False
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assert Example.get_existing_instance() is current
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assert Example.release_existing_instance(current) is True
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assert Example.get_existing_instance() is None
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def test_class_singleton_releases_only_matching_owner(monkeypatch):
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"""按类单例仅允许当前 owner 释放自身身份。"""
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class Example(metaclass=SingletonClass):
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"""用于验证按类单例 owner 身份。"""
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monkeypatch.setattr(SingletonClass, "_instances", {})
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current = Example()
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assert Example.release_existing_instance(object()) is False
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assert Example.get_existing_instance() is current
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assert Example.release_existing_instance(current) is True
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assert Example.get_existing_instance() is None
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def test_weak_singleton_reads_and_releases_only_current_owner(monkeypatch):
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"""弱单例应支持不触发构造的读取，并只释放当前 owner。"""
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class Example(metaclass=WeakSingleton):
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"""用于验证弱单例 owner 身份。"""
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monkeypatch.setattr(WeakSingleton, "_instances", {})
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assert Example.get_existing_instance() is None
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current = Example()
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assert Example.get_existing_instance() is current
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assert Example.release_existing_instance(object()) is False
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assert Example.release_existing_instance(current) is True
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assert Example.get_existing_instance() is None
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def test_parameterized_singleton_can_retain_failed_lifecycle_owner(monkeypatch):
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"""构造中途失败时，可选 owner 单例必须仍能由启动失败清理读取。"""
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class Example(metaclass=Singleton):
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"""模拟在构造期已创建后台 owner 后抛错的参数化单例。"""
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_retain_failed_singleton = True
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def __init__(self) -> None:
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"""发布可观察 owner 后模拟后续启动失败。"""
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self.owner_started = True
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raise RuntimeError("startup failed")
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monkeypatch.setattr(Singleton, "_instances", {})
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with pytest.raises(RuntimeError, match="startup failed"):
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Example()
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retained = Example.get_existing_instance()
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assert retained is not None
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assert retained.owner_started is True
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def test_class_singleton_can_retain_failed_lifecycle_owner(monkeypatch):
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"""按类 owner 单例也必须在 __init__ 抛错后保留可清理身份。"""
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class Example(metaclass=SingletonClass):
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"""模拟目录监控构造中途失败的按类单例。"""
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_retain_failed_singleton = True
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def __init__(self) -> None:
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"""发布可观察 owner 后模拟后续启动失败。"""
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self.owner_started = True
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raise RuntimeError("startup failed")
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monkeypatch.setattr(SingletonClass, "_instances", {})
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with pytest.raises(RuntimeError, match="startup failed"):
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Example()
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retained = Example.get_existing_instance()
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assert retained is not None
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assert retained.owner_started is True
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