When building a unit test, is it appropriate to use a mocking tool to assist you in setting up an object even if you will not be mocking any behavior or verifying any interaction with that object?

Here is a simple example in pseudo-code:

//an object we actually want to mock
Object someMockedObject = Mock(Object.class);
EqualityChecker checker = new EqualityChecker(someMockedObject);

//an object we are mocking only to avoid figuring out how to instantiate or 
//tying ourselves to some constructor that may be removed in the future
ComplicatedObject someObjectThatIsHardToInstantiate = Mock(ComplicatedObject.class);

//set the expectation on the mock
When(someMockedObject).equals(someObjectThatIsHardToInstantiate).return(false);
Assert(equalityChecker.check(someObjectThatIsHardToInstantiate)).isFalse();

//verify that the mock was interacted with properly
Verify(someMockedObject).equals(someObjectThatIsHardToInstantiate).oneTime();

Is it appropriate to mock ComplicatedObject in this scenario?