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

以下代码导致org.mockito.exceptions.misusing.MissingMethodInvocationException：

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

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您是否检查了

MissingMethodInvocationException

异常消息

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.

类

Level

是final（显然不是我记得扩展这个类的时候），或者

getSyslogEquivalent

是final（最佳猜测）

因此，您应该修改设计或测试设计，或者尝试Powermock，它提供了最终的类/方法模拟

希望有帮助