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DI: draft implementation for testmock support

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This commit is contained in:
Fischlurch 2018-03-18 00:05:02 +01:00
parent 786f051132
commit f0c8928301
2 changed files with 168 additions and 15 deletions
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140
research/try.cpp
View file

@ -182,6 +182,14 @@ class DependInject
{
using Factory = typename Depend<SRV>::Factory;
public:
template<class SUB>
static void
__assert_compatible()
{
static_assert (std::is_base_of<SRV,SUB>::value,
"Installed implementation class must be compatible to the interface.");
}
static void
installFactory (Factory&& otherFac)
{
@ -193,6 +201,24 @@ class DependInject
Depend<SRV>::factory = move (otherFac);
}
static void
temporarilyInstallAlternateFactory (SRV*& stashInstance, Factory& stashFac, Factory&& newFac)
{
ClassLock<SRV> guard;
stashFac = move(Depend<SRV>::factory);
stashInstance = Depend<SRV>::instance;
Depend<SRV>::factory = move(newFac);
Depend<SRV>::instance = nullptr;
}
static void
restoreOriginalFactory (SRV*& stashInstance, Factory& stashFac)
{
ClassLock<SRV> guard;
Depend<SRV>::factory = move(stashFac);
Depend<SRV>::instance = stashInstance;
}
static void
disableFactory()
{
@ -225,6 +251,7 @@ class DependInject
static void
useSingleton()
{
__assert_compatible<SUB>();
static InstanceHolder<SUB> singleton;
installFactory ([&]()
{
@ -243,6 +270,7 @@ class DependInject
ServiceInstance()
: instance_(new IMP{})
{
__assert_compatible<IMP>();
activateServiceAccess (*instance_);
}
@ -251,6 +279,10 @@ class DependInject
deactivateServiceAccess();
}
ServiceInstance (ServiceInstance&&) = default;
ServiceInstance (ServiceInstance const&) = delete;
ServiceInstance& operator= (ServiceInstance&&) = delete;
explicit
operator bool() const
{
@ -272,13 +304,54 @@ class DependInject
}
};
template<class IMP>
template<class MOC>
class Local
{
std::unique_ptr<MOC> mock_;
SRV* origInstance_;
Factory origFactory_;
public:
Local()
{
__assert_compatible<MOC>();
temporarilyInstallAlternateFactory (origInstance_, origFactory_
,[this]()
{
disableFactory();
mock_.reset(new MOC{});
return mock_.get();
});
}
~Local()
{
restoreOriginalFactory (origInstance_, origFactory_);
}
Local (Local&&) = default;
Local (Local const&) = delete;
Local& operator= (Local&&) = delete;
explicit
operator bool() const
{
return bool(mock_);
}
MOC&
operator* () const
{
ENSURE (mock_);
return *mock_;
}
MOC*
operator-> () const
{
ENSURE (mock_);
return mock_.get();
}
};
};
@ -367,6 +440,69 @@ main (int, char**)
VERIFY_ERROR (LIFECYCLE, DependInject<Dum>::ServiceInstance<SubDummy>{} );
SHOW_EXPR( checksum );
{
DependInject<Dum>::Local<SubDummy> mockDum;
DependInject<Dummy<3>>::Local<SubDummy> mockDummy3;
CHECK (!mockDum);
CHECK (!mockDummy3);
SHOW_EXPR( dumm().probe() );
CHECK ( mockDum);
CHECK (!mockDummy3);
SHOW_EXPR( checksum );
SHOW_EXPR( mockDum->probe() );
SHOW_EXPR( checksum );
mockDum->offset = 20;
SHOW_EXPR( dumm().probe() );
VERIFY_ERROR (LIFECYCLE, mockDummy3->probe() );
SHOW_EXPR( checksum );
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( checksum );
CHECK ( mockDummy3);
SHOW_EXPR( mockDummy3->probe() );
SHOW_EXPR( checksum );
mockDummy3->offset = 10;
SHOW_EXPR( dep3().probe() );
mockDum->offset = 50;
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( dumm().probe() );
SHOW_EXPR( checksum );
}
SHOW_EXPR( checksum );
SHOW_EXPR( dumm().probe() );
VERIFY_ERROR (LIFECYCLE, dep3().probe() );
SHOW_EXPR( checksum );
{
DependInject<Dummy<3>>::ServiceInstance<SubDummy> service{};
SHOW_EXPR( checksum );
SHOW_EXPR( dep3().probe() );
service->offset = 5;
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( checksum );
{
DependInject<Dummy<3>>::Local<SubDummy> mockDummy31;
CHECK (!mockDummy31);
SHOW_EXPR( checksum );
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( checksum );
mockDummy31->offset = 10;
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( mockDummy31->probe() );
SHOW_EXPR( service->probe() );
CHECK (mockDummy31->offset != service->offset);
service->offset = 35;
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( mockDummy31->probe() );
SHOW_EXPR( service->probe() );
SHOW_EXPR( checksum );
}
SHOW_EXPR( checksum );
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( checksum );
}
SHOW_EXPR( checksum );
VERIFY_ERROR (LIFECYCLE, dep3().probe() );
SHOW_EXPR( checksum );
cout << "\n.gulp.\n";

43
wiki/thinkPad.ichthyo.mm
View file

@ -26839,21 +26839,38 @@
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