当模拟 org.apache.log4j.Level 类时出现 MissingMethodInvocationException 异常

Question

以下代码会导致 org.mockito.exceptions.misusing.MissingMethodInvocationException 异常：

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

- DarVar

Answer 1

您有检查MissingMethodInvocationException异常消息吗？

它说：

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.

要么类Level是final的（我记得扩展了这个类，所以显然不是final）要么getSyslogEquivalent是final的（最好的猜测）。因此，您应该修改您的设计或测试设计，或者尝试使用Powermock，它提供了终极类/方法模拟。希望可以帮到您。

- bric3