懲戒靜態類中的Mockito

Question

我有類似如下：

public class Foo { 

    public static String getValue(String key) { 
     return key + "_" + System.currentTimeMillis(); 
    } 
} 

現在我需要有一個測試用例，並在這裏是我嘗試：

@Test 
public void testFoo() { 
    PowerMockito.mockStatic(Foo.class); 
    PowerMockito.when(Foo.getValue("123")).thenReturn("abcd"); 
    PowerMockito.verifyStatic(); 

} 

當我運行測試用例，我得到這個：

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'. 
For example: 
    when(mock.getArticles()).thenReturn(articles); 

Also, this error might show up because: 
1. you stub either of: final/private/equals()/hashCode() methods. 
    Those methods *cannot* be stubbed/verified. 
    Mocking methods declared on non-public parent classes is not supported. 
2. inside when() you don't call method on mock but on some other object. 

    at org.powermock.api.mockito.PowerMockito.when(PowerMockito.java:495) 

我做錯了什麼？

請指教。

Answer 1

您是否確定您已將@PrepareForTest(Foo.class)註釋添加到您的測試課程列表中on the PowerMock site，並且您使用的是PowerMockRunner JUnit4跑步者？

使用靜態分派調用靜態方法，而不是使用Java的正常多態性和方法重寫動態分派。爲了替換實現，PowerMock需要在測試開始運行之前加載替換類，並使跑步者和註釋發生。