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30 lines
971 B
Python
30 lines
971 B
Python
from app.utils.singleton import Singleton, SingletonClass
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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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