Turned documentation code into example code

git-svn-id: https://svn.code.sf.net/p/turtle/code/trunk@578 860be788-9bd5-4423-9f1e-828f051e677b

build/boost/doc/example/motivation.cpp

@@ -0,0 +1,68 @@
+#define BOOST_AUTO_TEST_MAIN
+#include <boost/test/auto_unit_test.hpp>
+#include <boost/mock/mock.hpp>
+#include "calculator.hpp"
+#include "mock_view.hpp"
+
+namespace simple
+{
+//[ simple_calculator
+class calculator
+{
+public:
+    int add( int a, int 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 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 )
+{
+    my_view v;
+    calculator c( v );
+    c.add( 0, 0 );
+    BOOST_REQUIRE( v.called );
+    BOOST_CHECK_EQUAL( 0, v.value );
+}
+//]
+}
+
+namespace with_mock_object
+{
+//[ zero_plus_zero_is_zero_with_mock_object
+BOOST_AUTO_TEST_CASE( zero_plus_zero_is_zero )
+{
+    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 );
+}
+//]
+}