java PowerMock - 使用私有构造函数模拟单例
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PowerMock - Mock a Singleton with a Private Constructor
提问by Hyman
I'm using PowerMock with EasyMock, and wondered how I might mock a singleton with a private constructor?
我正在使用 PowerMock 和 EasyMock，想知道如何使用私有构造函数模拟单例？
Let's say I have the following class:
假设我有以下课程：
public class Singleton {
private static Singleton singleton = new Singleton();
private Singleton() { }
public static Singleton getInstance() {
return singleton;
}
public int crazyServerStuff() { ... }
}
And a class which uses this:
还有一个使用这个的类：
public class Thing {
public Thing() {}
public int doStuff(Singleton s) {
return s.crazyServerStuff() + 42;
}
}
How might I mock the crazyServerStuffmethod?
我该如何模拟该crazyServerStuff方法？
I've tried the following:
我尝试了以下方法：
@RunWith(PowerMockRunner.class)
@PrepareForTest(Singleton.class)
public class ThingTest extends AndroidTestCase {
@Test
public void testDoStuff() {
MemberModifier.suppress(MemberModifier.constructor(Singleton.class));
Singleton mockSingleton = PowerMock.createMock(Singleton.class);
...
}
}
But I get the error java.lang.IllegalArgumentException: No visible constructors in class Singleton
但我得到了错误 java.lang.IllegalArgumentException: No visible constructors in class Singleton
Does anyone know what I'm missing?
有谁知道我错过了什么？
采纳答案by Hyman
Sadly I don't think this is possible for Android - see this answer.
可悲的是，我认为这对 Android 来说是不可能的 - 请参阅此答案。
If you're not on Android, it looks like thisis how you do it.
如果您不是在 Android 上，看起来这就是您的操作方式。
回答by Pavel Lechev
I don't think you should suppress the constructor, but rather mock it:
我不认为你应该抑制构造函数，而是嘲笑它：
PowerMock.expectNew(Singleton.class).andReturn(mockObject)
