/** * @file lllazy_test.cpp * @author Nat Goodspeed * @date 2009-01-28 * @brief Tests of lllazy.h. * * $LicenseInfo:firstyear=2009&license=viewergpl$ * Copyright (c) 2009, Linden Research, Inc. * $/LicenseInfo$ */ // Precompiled header #include "linden_common.h" // associated header #include "lllazy.h" // STL headers #include <iostream> // std headers // external library headers #include <boost/lambda/construct.hpp> #include <boost/lambda/bind.hpp> // other Linden headers #include "../test/lltut.h" namespace bll = boost::lambda; /***************************************************************************** * Test classes *****************************************************************************/ // Let's say that because of its many external dependencies, YuckyFoo is very // hard to instantiate in a test harness. class YuckyFoo { public: virtual ~YuckyFoo() {} virtual std::string whoami() const { return "YuckyFoo"; } }; // Let's further suppose that YuckyBar is another hard-to-instantiate class. class YuckyBar { public: YuckyBar(const std::string& which): mWhich(which) {} virtual ~YuckyBar() {} virtual std::string identity() const { return std::string("YuckyBar(") + mWhich + ")"; } private: const std::string mWhich; }; // Pretend that this class would be tough to test because, up until we started // trying to test it, it contained instances of both YuckyFoo and YuckyBar. // Now we've refactored so it contains LLLazy<YuckyFoo> and LLLazy<YuckyBar>. // More than that, it contains them by virtue of deriving from // LLLazyBase<YuckyFoo> and LLLazyBase<YuckyBar>. // We postulate two different LLLazyBases because, with only one, you need not // specify *which* get()/set() method you're talking about. That's a simpler // case. class NeedsTesting: public LLLazyBase<YuckyFoo>, public LLLazyBase<YuckyBar> { public: NeedsTesting(): // mYuckyBar("RealYuckyBar") LLLazyBase<YuckyBar>(bll::bind(bll::new_ptr<YuckyBar>(), "RealYuckyBar")) {} virtual ~NeedsTesting() {} virtual std::string describe() const { return std::string("NeedsTesting(") + getLazy<YuckyFoo>(this).whoami() + ", " + getLazy<YuckyBar>(this).identity() + ")"; } private: // These instance members were moved to LLLazyBases: // YuckyFoo mYuckyFoo; // YuckyBar mYuckyBar; }; // Fake up a test YuckyFoo class class TestFoo: public YuckyFoo { public: virtual std::string whoami() const { return "TestFoo"; } }; // and a test YuckyBar class TestBar: public YuckyBar { public: TestBar(const std::string& which): YuckyBar(which) {} virtual std::string identity() const { return std::string("TestBar(") + YuckyBar::identity() + ")"; } }; // So here's a test subclass of NeedsTesting that uses TestFoo and TestBar // instead of YuckyFoo and YuckyBar. class TestNeedsTesting: public NeedsTesting { public: TestNeedsTesting() { // Exercise setLazy(T*) setLazy<YuckyFoo>(this, new TestFoo()); // Exercise setLazy(Factory) setLazy<YuckyBar>(this, bll::bind(bll::new_ptr<TestBar>(), "TestYuckyBar")); } virtual std::string describe() const { return std::string("TestNeedsTesting(") + NeedsTesting::describe() + ")"; } void toolate() { setLazy<YuckyFoo>(this, new TestFoo()); } }; // This class tests having an explicit LLLazy<T> instance as a named member, // rather than deriving from LLLazyBase<T>. class LazyMember { public: YuckyFoo& getYuckyFoo() { return *mYuckyFoo; } std::string whoisit() const { return mYuckyFoo->whoami(); } protected: LLLazy<YuckyFoo> mYuckyFoo; }; // This is a test subclass of the above, dynamically replacing the // LLLazy<YuckyFoo> member. class TestLazyMember: public LazyMember { public: // use factory setter TestLazyMember() { mYuckyFoo.set(bll::new_ptr<TestFoo>()); } // use instance setter TestLazyMember(YuckyFoo* instance) { mYuckyFoo.set(instance); } }; /***************************************************************************** * TUT *****************************************************************************/ namespace tut { struct lllazy_data { }; typedef test_group<lllazy_data> lllazy_group; typedef lllazy_group::object lllazy_object; lllazy_group lllazygrp("lllazy"); template<> template<> void lllazy_object::test<1>() { // Instantiate an official one, just because we can NeedsTesting nt; // and a test one TestNeedsTesting tnt; // std::cout << nt.describe() << '\n'; ensure_equals(nt.describe(), "NeedsTesting(YuckyFoo, YuckyBar(RealYuckyBar))"); // std::cout << tnt.describe() << '\n'; ensure_equals(tnt.describe(), "TestNeedsTesting(NeedsTesting(TestFoo, TestBar(YuckyBar(TestYuckyBar))))"); } template<> template<> void lllazy_object::test<2>() { TestNeedsTesting tnt; std::string threw; try { tnt.toolate(); } catch (const LLLazyCommon::InstanceChange& e) { threw = e.what(); } ensure_contains("InstanceChange exception", threw, "replace LLLazy instance"); } template<> template<> void lllazy_object::test<3>() { { LazyMember lm; // operator*() on-demand instantiation ensure_equals(lm.getYuckyFoo().whoami(), "YuckyFoo"); } { LazyMember lm; // operator->() on-demand instantiation ensure_equals(lm.whoisit(), "YuckyFoo"); } } template<> template<> void lllazy_object::test<4>() { { // factory setter TestLazyMember tlm; ensure_equals(tlm.whoisit(), "TestFoo"); } { // instance setter TestLazyMember tlm(new TestFoo()); ensure_equals(tlm.whoisit(), "TestFoo"); } } } // namespace tut