Re: [Boost-users] Boost.Mock ?

Subject: Re: [Boost-users] Boost.Mock ?
From: Mathieu Champlon (m.champlon_at_[hidden])
Date: 2014-01-14 00:52:05

Hi Gennadiy,

On 13/01/2014 04:25, Gennadiy Rozental wrote:
> Hi Mathieu,
>
> Can you please summary here in few paragraphs:
>
> * What exactly you want to test?

It's probably up to the user to decide what needs to be tested.
Any piece of code (sub-system) which interacts with another (the rest of 
the system) can be tested, with a few restrictions. For instance the 
library won't be able to inject a different function implementation 
without some kind of hook (e.g. a function pointer passed to the code 
under test).

> * What exactly you want to mock?

Classes, concepts, functions and function objects are supported, see 
http://mat007.users.sourceforge.net/boost_mock/boost_mock/reference.html#boost_mock.reference.creation

> * How do you want to record your expectations?
> * How do you want to test against these expectations?
> * Can you show some concise example if using this library? What do I start
> with? How do I write a test case?
>

Does the motivation example from the introduction answer your questions ?
http://mat007.users.sourceforge.net/boost_mock/boost_mock/motivation.html

I'll copy it here if you want to discuss it:

class  view
{
public:
     virtual  void  display(  int  result  )  =  0;
};

class  calculator
{
public:
     calculator(  view&  v  );

     void  add(  int  a,  int  b  );  // the result will be sent to the view 'v'
};

BOOST_MOCK_BASE_CLASS(  mock_view,  view  )  // declare a 'mock_view' class implementing 'view'
{
     BOOST_MOCK_METHOD(  display,  1  )       // implement the 'display' method from 'view' (taking 1 argument)
};

BOOST_AUTO_TEST_CASE(  zero_plus_zero_is_zero  )
{
     mock_view  v;
     calculator  c(  v  );
     BOOST_MOCK_EXPECT(  v.display  ).once().with(  0  );  // expect the 'display' method to be called once (and only once) with a parameter value equal to 0
     c.add(  0,  0  );
}

Cheers,
MAT.