Changed layout to match boost

doc/motivation.qbk

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+[/
+ / Copyright (c) 2014 Mathieu Champlon
+ /
+ / Distributed under the Boost Software License, Version 1.0. (See accompanying
+ / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ /]
+
+[section Motivation]
+[import example/motivation.cpp]
+[import example/calculator.hpp]
+[import example/mock_view.hpp]
+[import example/view.hpp]
+
+Consider a (very) simple calculator class :
+
+[simple_calculator]
+
+Obviously writing unit tests for such a class is trivial, one of them could be :
+
+[simple_zero_plus_zero_is_zero]
+
+What now if the calculator class looks more like this :
+
+[view]
+[calculator]
+
+Writing unit tests becomes a bit more tedious and requires some boiler-plate code, for instance :
+
+[my_view]
+[zero_plus_zero_is_zero_without_mock_object]
+
+Mock objects main purpose is to alleviate the user from the burden of writing all this boiler-plate code.
+
+Here is how the last test can be rewritten using a mock object :
+
+[mock_view]
+[zero_plus_zero_is_zero_with_mock_object]
+
+and all the checks are automatically handled by the library.
+
+[endsect]