java 使用 PowerMockito 模拟单身人士
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Mocking singleton with PowerMockito
提问by Biologeek
in order to test one of the private method I coded, I need to mock a Singleton.
为了测试我编码的私有方法之一，我需要模拟一个单例。
After testing several methods with PowerMockito :
在使用 PowerMockito 测试了几种方法之后：
PowerMockito.mockStatic(UtilDatabaseSoldeAutoCdeCommon.class);
Mockito.when(UtilDatabaseSoldeAutoCdeCommon.getInstance()).thenReturn(mockDatabase);
I could never mock this class. Thus I cannot test my methods as in every of them, I access to database.
我永远无法嘲笑这门课。因此，我无法像在每个方法中一样测试我的方法，我访问数据库。
UtilDatabaseSoldeAutoCdeCommon is defined as such :
UtilDatabaseSoldeAutoCdeCommon 定义如下：
public class UtilDatabaseSoldeAutoCdeCommon extends AbstractUtilDatabase {
private static UtilDatabaseSoldeAutoCdeCommon instance;
private UtilDatabaseSoldeAutoCdeCommon() {
super();
}
public static UtilDatabaseSoldeAutoCdeCommon getInstance() {
if(instance == null) {
instance = new UtilDatabaseSoldeAutoCdeCommon();
}
return instance;
}
...
}
I debugged powermockito when it calls getInstance() but everytime consructor is called, it crashes as it tries to load configuration file (which does not exist).
我在调用 getInstance() 时调试了 powermockito，但是每次调用构造函数时，它都会在尝试加载配置文件（不存在）时崩溃。
I precise that config file is defined as a constant in absract parent class of UtilDatabaseEnrichissement and used in constructor.
我确切地说，配置文件被定义为 UtilDatabaseEnrichissement 的抽象父类中的常量，并在构造函数中使用。
How could I test this part ?
我怎么能测试这部分？
回答by asch
I think this should work:
我认为这应该有效：
@PrepareForTest({UtilDatabaseSoldeAutoCdeCommon.class})
public class SomeTest {
@Mock
UtilDatabaseSoldeAutoCdeCommon fakeSingletonInstance;
@Test
public void test() {
Whitebox.setInternalState(UtilDatabaseSoldeAutoCdeCommon.class, "instance", fakeSingletonInstance);
// Write here your test
}
}
回答by Mahesh
This question was asked long time back and I was facing similar issue and unable to find good answers hence answering it now. I tested the class with suppressing constructor like
这个问题很久以前就被问到了，我面临着类似的问题，无法找到好的答案，因此现在回答。我用抑制构造函数测试了类
PowerMockito.suppress(UtilDatabaseSoldeAutoCdeCommon.class.getConstructors());
PowerMockito.suppress(UtilDatabaseSoldeAutoCdeCommon.class.getConstructors());
回答by Slava Shpitalny
PrepareForTest the singleton class you mock
PrepareForTest 你模拟的单例类
