turtle/doc/example/motivation.cpp

// http://turtle.sourceforge.net
//
// Copyright Mathieu Champlon 2014
//
// 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)

#include "calculator.hpp"
#include "mock_view.hpp"
#include <turtle/mock.hpp>
#include <boost/test/unit_test.hpp>

namespace simple {
//[ simple_calculator
class calculator
{
public:
    int add(int a, int b);
};
//]

int calculator::add(int a, int b)
{
    return a + b;
}

//[ simple_zero_plus_zero_is_zero
BOOST_AUTO_TEST_CASE(zero_plus_zero_is_zero)
{
    calculator c;
    BOOST_CHECK_EQUAL(0, c.add(0, 0));
}
//]
} // namespace simple

namespace without_mock_object {
//[ my_view
class my_view : public view
{
public:
    my_view() : called(false) {}
    virtual void display(int result)
    {
        called = true;
        value = result;
    }
    bool called;
    int value;
};
//]

//[ zero_plus_zero_is_zero_without_mock_object
BOOST_AUTO_TEST_CASE(zero_plus_zero_is_zero_without_mock_object)
{
    my_view v;
    calculator c(v);
    c.add(0, 0);
    BOOST_REQUIRE(v.called);
    BOOST_CHECK_EQUAL(0, v.value);
}
//]
} // namespace without_mock_object

namespace with_mock_object {
//[ zero_plus_zero_is_zero_with_mock_object
BOOST_AUTO_TEST_CASE(zero_plus_zero_is_zero_with_mock_object)
{
    mock_view v;
    calculator c(v);
    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);
}
//]
} // namespace with_mock_object