Effective Java 有以下关于单元测试单例的声明
Making a class a singleton can make it difficult to test its clients, as it’s impossible to substitute a mock implementation for a singleton unless it implements an interface that serves as its type.
谁能解释为什么会这样？
最佳答案
您可以使用反射来重置您的单例对象，以防止测试相互影响。
@Before
public void resetSingleton() throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
Field instance = MySingleton.class.getDeclaredField("instance");
instance.setAccessible(true);
instance.set(null, null);
}
关于java - 单例和单元测试，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8256989/