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#include "common.hh"
#include "observer_list.hh"
#include <gmock/gmock.h>
#include <gtest/gtest.h>
namespace {
class Observer {
public:
virtual ~Observer() = default;
virtual void foo() = 0;
};
class MockObserver : public Observer {
public:
MOCK_METHOD(void, foo, (), (override));
};
} // namespace
TEST(observer_list, empty) {
ObserverList<Observer> observers;
EXPECT_TRUE(observers.empty());
auto it = observers.notify();
EXPECT_FALSE(it);
++it;
EXPECT_FALSE(it);
}
TEST(observer_list, sanity) {
ObserverList<Observer> observers;
MockObserver observer;
observers.add(&observer);
EXPECT_CALL(observer, foo());
for (auto it = observers.notify(); it; ++it)
it->foo();
}
TEST(observer_list, observer_removing_next_observer) {
ObserverList<Observer> observers;
MockObserver observer1;
MockObserver observer2;
observers.add(&observer1);
observers.add(&observer2);
EXPECT_CALL(observer1, foo())
.WillOnce([&]() { observers.remove(&observer2); })
.WillOnce(testing::Return());
EXPECT_CALL(observer2, foo())
.Times(0);
for (auto it = observers.notify(); it; ++it)
it->foo();
for (auto it = observers.notify(); it; ++it)
it->foo();
}
TEST(observer_list, observer_removing_previous_observer) {
ObserverList<Observer> observers;
MockObserver observer1;
MockObserver observer2;
observers.add(&observer1);
observers.add(&observer2);
EXPECT_CALL(observer1, foo());
EXPECT_CALL(observer2, foo())
.WillOnce([&]() { observers.remove(&observer1); })
.WillOnce(testing::Return());
for (auto it = observers.notify(); it; ++it)
it->foo();
for (auto it = observers.notify(); it; ++it)
it->foo();
}
TEST(observer_list, observer_removing_itself) {
ObserverList<Observer> observers;
MockObserver observer;
observers.add(&observer);
EXPECT_CALL(observer, foo())
.WillOnce([&]() { observers.remove(&observer); });
for (auto it = observers.notify(); it; ++it)
it->foo();
EXPECT_TRUE(observers.empty());
}
TEST(observer_list, observer_adding_observer) {
ObserverList<Observer> observers;
MockObserver observer1;
MockObserver observer2;
observers.add(&observer1);
EXPECT_CALL(observer1, foo())
.WillOnce([&]() { observers.add(&observer2); })
.WillOnce(testing::Return());
EXPECT_CALL(observer2, foo());
for (auto it = observers.notify(); it; ++it)
it->foo();
for (auto it = observers.notify(); it; ++it)
it->foo();
}
TEST(observer_list, observer_start_new_notify) {
ObserverList<Observer> observers;
MockObserver observer1;
MockObserver observer2;
observers.add(&observer1);
observers.add(&observer2);
EXPECT_CALL(observer1, foo())
.WillOnce([&]() {
observers.remove(&observer1);
for (auto it = observers.notify(); it; ++it)
it->foo();
});
EXPECT_CALL(observer2, foo())
.Times(2);
for (auto it = observers.notify(); it; ++it)
it->foo();
}
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