MissingMethodInvocationException嘲諷一個org.apache.log4j.Level類

Question

下面的代碼導致org.mockito.exceptions.misusing.MissingMethodInvocationException時：

Level level = mock(Level.class); 
IOException ioException = new IOException("test"); 
when(level.getSyslogEquivalent()).thenThrow(ioException); 

Answer 1

你檢查MissingMethodInvocationException異常消息？

它說：

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. 
2. inside when() you don't call method on mock but on some other object. 
3. the parent of the mocked class is not public. 
    It is a limitation of the mock engine. 

要麼類Level是最後的（顯然不是，因爲我記得擴展此類）或getSyslogEquivalent是最後的（最好的猜測）。

所以你應該修改你的設計或測試設計，或者試試Powermock，它提供了最終的類/方法嘲諷。

希望可以幫到