91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
/*
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MOCKINJECTOR.hpp - replacement singleton factory for injecting Test-Mock objects
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Copyright (C) Lumiera.org
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2008, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef LUMIERA_TEST_MOCKINJECTOR_H
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#define LUMIERA_TEST_MOCKINJECTOR_H
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#include "lib/singletonfactory.hpp"
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#include <boost/scoped_ptr.hpp>
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namespace lib {
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namespace test{
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using boost::scoped_ptr;
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/**
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* Special SingletonFactory allowing to inject some instance of the Singleton
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* class, thus shadowing "the" (default) Singleton instance temporarily.
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* This allows installing a Mock Subclass of the Singleton for running tests,
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* while the Singleton can be used as usual in production code.
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* @note we use the default policies or SingletonFactory
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*/
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template<class SI>
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class MockInjector : public SingletonFactory<SI>
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{
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scoped_ptr<SI> mock_;
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public:
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/** Overwriting the normal Singleton creation Interface
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* to return some mock if defined, falling back to the
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* default Singleton creation behaviour else.
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*/
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SI& operator() ()
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{
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if (mock_)
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return *mock_;
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else
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return SingletonFactory<SI>::operator() ();
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}
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void injectSubclass (SI* mockobj)
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{
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TRACE_IF (mockobj, test, "Singleton: installing Mock object");
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TRACE_IF (!mockobj, test, "Singleton: removing Mock object");
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mock_.reset (mockobj);
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}
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MockInjector () {};
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/** @note MockInjector singleton factory objects can be copied,
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* but the copy will start out with clean internal state,
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* i.e. exhibiting normal SingletonFactory behaviour
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* without mock object.
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*/
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MockInjector (const MockInjector& other)
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: SingletonFactory<SI>(other), mock_(0) { }
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MockInjector<SI>& operator= (const MockInjector<SI>& other)
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{
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return SingletonFactory<SI>::operator= (other);
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}
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};
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}} // namespace lib::test
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#endif
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