PowerMockito mocking static class INSIDE enum?

Question

我有一个枚举，它必须有一个用于 bean 注入的内部静态类。

我觉得我面临着模拟最困难的情况：枚举，静态类，静态字段，静态方法。

public enum Category{
C1(Something(Constants.getFactory().createSomething(""))),
C2(...);
public static Constants {
@Autowired
private static Factory factory;
public static Factory getFactory(){
return factory;
}
}
}

我使用 PowerMockito 的测试类是：

@RunWith(PowerMockRunner.class)
@PrepareForTest({Category.class,Category.Constants.class})
public class CategoryTests {
@Before
public void setUp() throws Exception {
PowerMockito.mockStatic(Category.class);
PowerMockito.mockStatic(Category.Constants.class);  
//This simply testing mock didn't work             
//PowerMockito.when(Category.Constants
//                .getFactory()).thenReturn("123");

//I tried to mock the inner field 'factory' and use it directly without a getter 
//(with small changes in the original class)
//But it didn't work either
Factory factory = PowerMockito.mock(Factory.class);
NewClass newClass = PowerMockito.mock(NewClass.class);
PowerMockito.when(Factory.createSomething(anySring()))
.thenReturn(newClass);
Whitebox.setInternalState(
Category.Constants.class,"factory",Factory);

//This is like the most common way to stub
//It didn't work, so I believe the inner static class were never mocked
PowerMockito.doReturn(factory).when(Category.Constants.class,
"getFactory", anyString());
}

//I don't know if real test cases matter that much but I update to add it for reference.
@Test(dataProvider = "Case1")
public void testFromFilterType(final String testName, String input, final Category expected) {
assertEquals(Category.doSomething(input), expected);
}
@DataProvider(name = "Case1")
Object[][] fromFilterTypeCases() {
return new Object[][] {
{ "C1", "input1", Category.C1 },
{ "C2", "input2", Category.C2 },
};
}
}
//Currently the tests got skipped because in class Category Constants.getFactory().createSomething(""), 
//where Constants.getFactory() returns null and mocking doesn't work.

起初我没有嘲笑 Enum，而只是嘲笑静态的内部类。经过大量搜索，我尝试了各种方法。设置似乎正确，但可能会错过一些技巧。有什么帮助吗？

Answer 1

有点猜测：Category.class是你打算测试的类。该类本身不包含任何需要模拟/准备的内容。 所以：把这些部分放在你的代码中。即使它不会导致您当前的问题，我很确定当您以后开始测试时，它可能会产生各种不必要的后果。

除此之外，真正的答案是首先避免PowerMock(ito(的必要性。您已经在使用 @Autowired，这意味着您正在使用 DI 框架。大多数 DI 框架也有用于单元测试的钩子。因此，您应该尝试让@Autowired在您的测试设置中工作。