test_delegates.cpp

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// Bring in my package's API, which is what I'm testing
#include <socketcan_interface/delegates.h>
#include <socketcan_interface/dummy.h>
#include <boost/bind.hpp>

// Bring in gtest
#include <gtest/gtest.h>

class Receiver {
public:
    std::list<std::string> responses;
    void handle(const can::Frame &f){
        responses.push_back(can::tostring(f, true));
    }
    Receiver() = default;
    ~Receiver() = default;

private:
    Receiver(const Receiver&) = delete;
    Receiver& operator=(const Receiver&) = delete;
};

Receiver g_r2;

void fill_r2(const can::Frame &f){
    g_r2.handle(f);
}

void fill_any(Receiver &r, const can::Frame &f){
    r.handle(f);
}

TEST(DelegatesTest, testFrameDelegate)
{

    can::DummyInterface dummy(true);
    Receiver r1, r3, r4, r5;
    boost::shared_ptr<Receiver> r6(new Receiver());
    std::shared_ptr<Receiver> r7(new Receiver());

    can::FrameListenerConstSharedPtr l1 = dummy.createMsgListener(can::CommInterface::FrameDelegate(&r1, &Receiver::handle));
    can::FrameListenerConstSharedPtr l2 = dummy.createMsgListener(can::CommInterface::FrameDelegate(fill_r2));
    can::FrameListenerConstSharedPtr l3 = dummy.createMsgListener(can::CommInterface::FrameDelegate(std::bind(fill_any, std::ref(r3), std::placeholders::_1)));
    can::FrameListenerConstSharedPtr l4 = dummy.createMsgListener(std::bind(fill_any, std::ref(r4), std::placeholders::_1));
    can::FrameListenerConstSharedPtr l5 = dummy.createMsgListener(boost::bind(fill_any, boost::ref(r5), boost::placeholders::_1));
    can::FrameListenerConstSharedPtr l6 = dummy.createMsgListener(can::CommInterface::FrameDelegate(r6, &Receiver::handle));
    can::FrameListenerConstSharedPtr l7 = dummy.createMsgListener(can::CommInterface::FrameDelegate(r7, &Receiver::handle));

    std::list<std::string> expected;
    dummy.send(can::toframe("0#8200"));
    expected.push_back("0#8200");

    EXPECT_EQ(expected, r1.responses);
    EXPECT_EQ(expected, g_r2.responses);
    EXPECT_EQ(expected, r3.responses);
    EXPECT_EQ(expected, r4.responses);
    EXPECT_EQ(expected, r5.responses);
    EXPECT_EQ(expected, r6->responses);
    EXPECT_EQ(expected, r7->responses);
}

class BoolTest {
    bool ret_;
public:
    bool test_bool() { return ret_; }
    BoolTest(bool ret) : ret_(ret) {}
public:
    BoolTest(const BoolTest&) = delete;
    BoolTest& operator=(const BoolTest&) = delete;
};

TEST(DelegatesTest, testBoolFunc)
{

    using BoolFunc = std::function<bool(void)>;
    using BoolDelegate = can::DelegateHelper<BoolFunc>;

    BoolDelegate d1([]() { return false; });
    BoolDelegate d2([]() { return true; });

    EXPECT_FALSE(d1());
    EXPECT_TRUE(d2());

    BoolTest b1(false);
    BoolTest b2(true);

    BoolDelegate d3(&b1, &BoolTest::test_bool);
    BoolDelegate d4(&b2, &BoolTest::test_bool);
    EXPECT_FALSE(d3());
    EXPECT_TRUE(d4());

}


// Run all the tests that were declared with TEST()
int main(int argc, char **argv){
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}