Java，Mockito-如何找出调用了哪些模拟？

Question

I don't really care when the mock is called - pretty much, i'm migrating a bunch of mocks into real world code, because mocks in an integration test are sometimes pretty stupid.

Anyway, here i am with a gigantic class full of mocks setup - but what i really want are for each test to find out which mocks are used.

With mockito, can i get it to, i don't know, "log" or print or something whenever a particular "when" is actually executed?

Answer 1

Since Mockito 1.9.0 you can use the verboseLogging setting.

For example, this:

@Test
public void testLogging() {
  final List<?> mockList = mock(List.class, withSettings().verboseLogging());
  when(mockList.size()).thenReturn(6);

  mockList.size();
}

Produces:

###### Logging method invocation #1 on mock/spy ######## list.size(); invoked: -> at

soanswers.mockito.LogCalls.testLogging(LogCalls.java:35) has returned: "0" (java.lang.Integer)

###### Logging method invocation #2 on mock/spy ######## stubbed: -> at

soanswers.mockito.LogCalls.testLogging(LogCalls.java:35) list.size(); invoked: -> at soanswers.mockito.LogCalls.testLogging(LogCalls.java:37) has returned: "6" (java.lang.Integer)

Answer 2

I found an issue on the mockito webpage that suggests this is possible: http://code.google.com/p/mockito/issues/detail?id=148

Hi, I've prepared a patch at the following branch. I'd appreciate feedback on anything that needs change.

http://code.google.com/r/muratknecht-mockito-issue148/

The API is as agreed:

Foo foo = mock(Foo.class, withSettings().verboseLogging());

and

Foo foo = mock(Foo.class, withSettings().callback(new RememberingListener()));

The former will print invocation infos to std out. Here an example. This is just a proposal, of course. The location info (-> at ...), however, is simply what the listener gets, and therefor cannot be changed without exposing Location and its fields.

###### Logging method invocation #3 on mock/spy ######## foo.giveMeSomeString("another string value"); -> at

org.mockitousage.debugging.VerboseLoggingOfInvocationsOnMockTest.usage(VerboseLoggingOfInvocationsOnMockTest.java:154) Will return: >some return value< (java.lang.String) Method has been stubbed. -> at org.mockitousage.debugging.VerboseLoggingOfInvocationsOnMockTest.usage(VerboseLoggingOfInvocationsOnMockTest.java:149)

#

The usage-level tests are InvocationListenerCallbackTest and VerboseLoggingOfInvocationsOnMockTest. You may want to have a closer look at the latter (see the class comment). As always with usage-level tests that make assertions regarding the contents of the standard output stream, it gets a bit messy.

I tried it out in one of my tests and it seems to do what you want. You should use the first example that looks like this:

Foo foo = mock(Foo.class, withSettings().verboseLogging());