Disable logger during junit testing?
Is it possible to disable the execution of the logger during testing?
I have this class
public class UnitTestMe {
private final MockMe mockMe;
private final SomethingElse something;
private final Logger logger = LoggerFactory.getLogger(this.getClass().getClass());
public UnitTestMe(MockMe mockMe, SomethingElse something) {
this..
}
public toTest() {
logger.info("Executing toTest. MockMe a: {}, Foo: b: {}", mockMe.toString(), something.foo().bar());
mockMe.execute();
}
}
My Unit Test is failing with an NullPointerException because something.foo() is not a mocked object (i am using mockito with nicemock).
How can I test this class without removing the logger statement and without mocking irrelevant parts of the dependencies like something
?
Edit: something is in this case a Customer Object, that is not 开发者_运维百科used in the toTest()
function but needed in other parts of this Class. I am using the Customer class in the logger statement to relate an action to an user.
Edit 2: Would it help to mock the logger object? I would assume that I will get an NullPointerException
again, because the methods of the `something´ object are executed, too.
Poor answer: first decrease logging level to WARN
or ERROR
for this logger. Then, surround logging statement with isInfoEnabled()
:
if(logger.isInfoEnabled())
logger.info("Executing toTest. MockMe a: {}, Foo: b: {}", mockMe.toString(), something.foo().bar());
Better one: it looks a bit weird that you are using some object only for logging, so when you are testing a toTest()
method, mocked dependency is used only for logging. I understand this is just an example, but looks like there is some design flaw. I would suggest mocking SomethingElse
for the sake of simplicity as well.
Your logging statement introduce an additional requirement for the mocking of something
. You must make it give a non-null value returned for foo(), or rewrite your logging statements to avoid introducing these extra things.
You can suppress the execution of logger
usecase for PowerMockito:
// this is to suppress for logger.error(Exception e)
PowerMockito.doNothing().when(logger, "error", (Exception) any(Exception.class));
// this is to suppress for logger.debug(String message)
PowerMockito.doNothing().when(logger, "debug",anyString());
You can use try catch NullPointerException
.
If your test method want to test NullPointerException it will be better us expect NullPointerException
@expect(NullPointerException.class)
public void testMethod() {
//your test method logic
}
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