clio/tests/unit/util/ObservableValueTest.cpp

#include "util/ObservableValue.hpp"

#include <boost/signals2/connection.hpp>
#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <concepts>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>

using namespace testing;
using namespace util;

namespace {

struct TestStruct {
    int value = 0;
    std::string name;

    bool
    operator==(TestStruct const& other) const
    {
        return value == other.value && name == other.name;
    }

    bool
    operator!=(TestStruct const& other) const
    {
        return !(*this == other);
    }
};

}  // namespace

class ObservableValueTest : public ::testing::Test {};

TEST_F(ObservableValueTest, ConceptCompliance)
{
    static_assert(Observable<int>);
    static_assert(Observable<std::string>);
    static_assert(Observable<double>);
    static_assert(Observable<TestStruct>);
    static_assert(Observable<bool>);
    static_assert(Observable<char>);
    static_assert(Observable<float>);

    struct NonCopyable {
        int value = 0;
        NonCopyable() = default;
        NonCopyable(NonCopyable const&) = delete;
        NonCopyable(NonCopyable&&) = default;
        NonCopyable&
        operator=(NonCopyable const&) = delete;
        NonCopyable&
        operator=(NonCopyable&&) = default;
        bool
        operator==(NonCopyable const& other) const
        {
            return value == other.value;
        }
    };
    static_assert(!Observable<NonCopyable>);

    struct NonMovable {
        int value = 0;
        NonMovable() = default;
        NonMovable(NonMovable const&) = default;
        NonMovable(NonMovable&&) = delete;
        NonMovable&
        operator=(NonMovable const&) = default;
        NonMovable&
        operator=(NonMovable&&) = delete;
        bool
        operator==(NonMovable const& other) const
        {
            return value == other.value;
        }
    };
    static_assert(!Observable<NonMovable>);

    struct NonComparable {
        int value = 0;
        NonComparable() = default;
        NonComparable(NonComparable const&) = default;
        NonComparable(NonComparable&&) = default;
        NonComparable&
        operator=(NonComparable const&) = default;
        NonComparable&
        operator=(NonComparable&&) = default;
    };
    static_assert(!Observable<NonComparable>);

    struct NonDefaultInitializable {
        int value;
        NonDefaultInitializable() = delete;
        explicit NonDefaultInitializable(int v) : value(v)
        {
        }
        NonDefaultInitializable(NonDefaultInitializable const&) = default;
        NonDefaultInitializable(NonDefaultInitializable&&) = default;
        NonDefaultInitializable&
        operator=(NonDefaultInitializable const&) = default;
        NonDefaultInitializable&
        operator=(NonDefaultInitializable&&) = default;
        bool
        operator==(NonDefaultInitializable const& other) const
        {
            return value == other.value;
        }
    };

    static_assert(Observable<NonDefaultInitializable>);
    static_assert(!std::default_initializable<NonDefaultInitializable>);

    static_assert(Observable<std::vector<int>>);
    static_assert(Observable<std::map<int, int>>);
    static_assert(Observable<std::set<int>>);
    static_assert(Observable<std::pair<int, std::string>>);

    static_assert(std::default_initializable<int>);
    static_assert(std::default_initializable<std::string>);
    static_assert(std::default_initializable<std::vector<int>>);
    static_assert(std::default_initializable<TestStruct>);
}

TEST_F(ObservableValueTest, Construction)
{
    ObservableValue<int> const obs{42};

    EXPECT_EQ(static_cast<int>(obs), 42);
    EXPECT_EQ(obs.get(), 42);
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, ConstructionWithDifferentTypes)
{
    ObservableValue<std::string> const obsStr{"hello"};
    EXPECT_EQ(obsStr.get(), "hello");

    ObservableValue<double> const obsDouble{3.14};
    EXPECT_DOUBLE_EQ(obsDouble.get(), 3.14);

    ObservableValue<bool> const obsBool{true};
    EXPECT_TRUE(obsBool.get());
}

TEST_F(ObservableValueTest, DefaultConstruction)
{
    ObservableValue<int> const obsInt;
    EXPECT_EQ(obsInt.get(), 0);

    ObservableValue<double> const obsDouble;
    EXPECT_DOUBLE_EQ(obsDouble.get(), 0.0);

    ObservableValue<bool> const obsBool;
    EXPECT_FALSE(obsBool.get());

    ObservableValue<char> const obsChar;
    EXPECT_EQ(obsChar.get(), '\0');

    EXPECT_FALSE(obsInt.hasObservers());
    EXPECT_FALSE(obsDouble.hasObservers());
    EXPECT_FALSE(obsBool.hasObservers());
    EXPECT_FALSE(obsChar.hasObservers());
}

TEST_F(ObservableValueTest, DefaultConstructionWithContainers)
{
    ObservableValue<std::string> const obsString;
    EXPECT_EQ(obsString.get(), "");
    EXPECT_TRUE(obsString.get().empty());

    ObservableValue<std::vector<int>> const obsVector;
    EXPECT_TRUE(obsVector.get().empty());
    EXPECT_EQ(obsVector.get().size(), 0);

    ObservableValue<std::set<int>> const obsSet;
    EXPECT_TRUE(obsSet.get().empty());
    EXPECT_EQ(obsSet.get().size(), 0);

    ObservableValue<std::map<int, std::string>> const obsMap;
    EXPECT_TRUE(obsMap.get().empty());
    EXPECT_EQ(obsMap.get().size(), 0);
}

TEST_F(ObservableValueTest, DefaultConstructionWithCustomType)
{
    ObservableValue<TestStruct> const obsStruct;
    EXPECT_EQ(obsStruct.get().value, 0);
    EXPECT_EQ(obsStruct.get().name, "");
}

TEST_F(ObservableValueTest, DefaultConstructionThenAssignment)
{
    ObservableValue<int> obs;
    EXPECT_EQ(obs.get(), 0);

    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(42));
    obs = 42;
    EXPECT_EQ(obs.get(), 42);

    obs = 42;  // Same value, should not notify

    EXPECT_CALL(mockObserver, Call(100));
    obs.set(100);
    EXPECT_EQ(obs.get(), 100);
}

TEST_F(ObservableValueTest, DefaultConstructionWithGuard)
{
    ObservableValue<std::string> obs;
    EXPECT_EQ(obs.get(), "");

    testing::StrictMock<testing::MockFunction<void(std::string const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call("modified through guard"));
    {
        auto guard = obs.operator->();
        std::string& ref = guard;
        ref = "modified through guard";
    }

    EXPECT_EQ(obs.get(), "modified through guard");
}

TEST_F(ObservableValueTest, DefaultConstructionNotificationBehavior)
{
    ObservableValue<int> obs;
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(1));
    obs = 1;

    EXPECT_CALL(mockObserver, Call(0));
    obs = 0;

    obs = 0;  // Same value, should not notify
}

TEST_F(ObservableValueTest, NonDefaultInitializableTypeWithParameterizedConstructor)
{
    struct NonDefaultInitializable {
        int value;
        NonDefaultInitializable() = delete;
        explicit NonDefaultInitializable(int v) : value(v)
        {
        }
        NonDefaultInitializable(NonDefaultInitializable const&) = default;
        NonDefaultInitializable(NonDefaultInitializable&&) = default;
        NonDefaultInitializable&
        operator=(NonDefaultInitializable const&) = default;
        NonDefaultInitializable&
        operator=(NonDefaultInitializable&&) = default;
        bool
        operator==(NonDefaultInitializable const& other) const
        {
            return value == other.value;
        }
    };

    ObservableValue<NonDefaultInitializable> obs{NonDefaultInitializable{42}};
    EXPECT_EQ(obs.get().value, 42);

    testing::StrictMock<testing::MockFunction<void(NonDefaultInitializable const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(testing::Field(&NonDefaultInitializable::value, 100)));
    obs = NonDefaultInitializable{100};
    EXPECT_EQ(obs.get().value, 100);
}

TEST_F(ObservableValueTest, MoveSemantics)
{
    ObservableValue<int> const obs1{100};

    ObservableValue<int> const obs2 = std::move(obs1);
    EXPECT_EQ(obs2.get(), 100);

    ObservableValue<int> obs3{200};
    obs3 = std::move(obs2);
    EXPECT_EQ(obs3.get(), 100);
}

TEST_F(ObservableValueTest, CopyOperationsDeleted)
{
    static_assert(!std::is_copy_constructible_v<ObservableValue<int>>);
    static_assert(!std::is_copy_assignable_v<ObservableValue<int>>);
}

TEST_F(ObservableValueTest, AssignmentOperator)
{
    ObservableValue<int> obs{10};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(20));
    obs = 20;
    EXPECT_EQ(obs.get(), 20);

    obs = 20;  // Same value, should not notify
    EXPECT_EQ(obs.get(), 20);
}

TEST_F(ObservableValueTest, SetMethod)
{
    ObservableValue<int> obs{5};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(15));
    obs.set(15);
    EXPECT_EQ(obs.get(), 15);

    obs.set(15);  // Same value, should not notify
    EXPECT_EQ(obs.get(), 15);
}

TEST_F(ObservableValueTest, ObserverManagement)
{
    ObservableValue<int> obs{0};

    EXPECT_FALSE(obs.hasObservers());

    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver1;
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver2;

    auto conn1 = obs.observe(mockObserver1.AsStdFunction());
    EXPECT_TRUE(obs.hasObservers());

    auto conn2 = obs.observe(mockObserver2.AsStdFunction());
    EXPECT_TRUE(obs.hasObservers());

    EXPECT_CALL(mockObserver1, Call(42));
    EXPECT_CALL(mockObserver2, Call(42));
    obs = 42;

    conn1.disconnect();
    EXPECT_CALL(mockObserver2, Call(100));
    obs = 100;

    conn2.disconnect();
    EXPECT_FALSE(obs.hasObservers());

    obs = 200;  // No observers, no calls expected
}

TEST_F(ObservableValueTest, ObservableGuardBasicUsage)
{
    ObservableValue<int> obs{10};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(25));
    {
        auto guard = obs.operator->();
        int& ref = guard;
        ref = 25;
    }

    EXPECT_EQ(obs.get(), 25);
}

TEST_F(ObservableValueTest, ObservableGuardNoChangeNoNotification)
{
    ObservableValue<int> obs{50};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    // No EXPECT_CALL since no notification should occur
    {
        auto guard = obs.operator->();
        int& ref = guard;
        ref = 100;
        ref = 50;  // Back to original value
    }

    EXPECT_EQ(obs.get(), 50);
}

TEST_F(ObservableValueTest, ObservableGuardMultipleChanges)
{
    ObservableValue<int> obs{1};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(2));
    {
        auto guard = obs.operator->();
        int& ref = guard;
        ref = 2;
    }

    EXPECT_CALL(mockObserver, Call(3));
    {
        auto guard = obs.operator->();
        int& ref = guard;
        ref = 3;
    }

    EXPECT_EQ(obs.get(), 3);
}

TEST_F(ObservableValueTest, ComplexTypeObservation)
{
    TestStruct const initial{.value = 42, .name = "test"};
    ObservableValue<TestStruct> obs{initial};

    testing::StrictMock<testing::MockFunction<void(TestStruct const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    TestStruct const newValue{.value = 100, .name = "changed"};
    EXPECT_CALL(
        mockObserver,
        Call(
            testing::AllOf(
                testing::Field(&TestStruct::value, 100),
                testing::Field(&TestStruct::name, "changed")
            )
        )
    );
    obs = newValue;
}

TEST_F(ObservableValueTest, ComplexTypeGuardModification)
{
    TestStruct const initial{.value = 10, .name = "initial"};
    ObservableValue<TestStruct> obs{initial};

    testing::StrictMock<testing::MockFunction<void(TestStruct const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(
        mockObserver,
        Call(
            testing::AllOf(
                testing::Field(&TestStruct::value, 20),
                testing::Field(&TestStruct::name, "modified")
            )
        )
    );
    {
        auto guard = obs.operator->();
        TestStruct& ref = guard;
        ref.value = 20;
        ref.name = "modified";
    }

    EXPECT_EQ(obs.get().value, 20);
    EXPECT_EQ(obs.get().name, "modified");
}

TEST_F(ObservableValueTest, StringObservation)
{
    ObservableValue<std::string> obs{"initial"};
    testing::StrictMock<testing::MockFunction<void(std::string const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call("changed"));
    obs = "changed";

    EXPECT_CALL(mockObserver, Call("set_method"));
    obs.set("set_method");

    obs = "set_method";  // Same value, should not notify
}

TEST_F(ObservableValueTest, MultipleObserversWithDifferentLifetimes)
{
    ObservableValue<int> obs{0};

    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver1;
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver2;
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver3;

    auto conn1 = obs.observe(mockObserver1.AsStdFunction());

    EXPECT_CALL(mockObserver1, Call(1));
    obs = 1;

    auto conn2 = obs.observe(mockObserver2.AsStdFunction());
    EXPECT_CALL(mockObserver1, Call(2));
    EXPECT_CALL(mockObserver2, Call(2));
    obs = 2;

    conn1.disconnect();
    auto conn3 = obs.observe(mockObserver3.AsStdFunction());
    EXPECT_CALL(mockObserver2, Call(3));
    EXPECT_CALL(mockObserver3, Call(3));
    obs = 3;
}

TEST_F(ObservableValueTest, NoNotificationWhenNoObservers)
{
    ObservableValue<int> obs{0};

    obs = 1;
    obs.set(2);

    {
        auto guard = obs.operator->();
        int& ref = guard;
        ref = 3;
    }

    EXPECT_EQ(obs.get(), 3);
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, ManyObservers)
{
    ObservableValue<int> obs{0};

    std::vector<std::unique_ptr<testing::StrictMock<testing::MockFunction<void(int const&)>>>>
        mockObservers;
    std::vector<boost::signals2::connection> connections;

    constexpr int kNUM_OBSERVERS = 100;
    for (int i = 0; i < kNUM_OBSERVERS; ++i) {
        mockObservers.push_back(
            std::make_unique<testing::StrictMock<testing::MockFunction<void(int const&)>>>()
        );
        connections.push_back(obs.observe(mockObservers.back()->AsStdFunction()));
    }

    EXPECT_TRUE(obs.hasObservers());

    for (auto const& mockObserver : mockObservers) {
        EXPECT_CALL(*mockObserver, Call(42));
    }
    obs = 42;

    for (auto& conn : connections) {
        conn.disconnect();
    }

    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, TypeConversions)
{
    ObservableValue<double> obs{1.0};

    testing::StrictMock<testing::MockFunction<void(double const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(testing::DoubleEq(2.0)));
    obs = 2;

    EXPECT_CALL(mockObserver, Call(testing::DoubleEq(3.14)));
    obs = 3.14;

    EXPECT_CALL(mockObserver, Call(testing::DoubleEq(4.0)));
    obs = static_cast<double>(4.0f);
}

TEST_F(ObservableValueTest, EnhancedConceptRequirements)
{
    struct ComplexObservable {
        std::string name;
        int value{};
        std::vector<int> data;

        ComplexObservable() = default;
        ComplexObservable(std::string n, int v, std::vector<int> d)
            : name(std::move(n)), value(v), data(std::move(d))
        {
        }
        ComplexObservable(ComplexObservable const& other) = default;
        ComplexObservable(ComplexObservable&& other) noexcept = default;

        ComplexObservable&
        operator=(ComplexObservable&& other) noexcept
        {
            if (this != &other) {
                name = std::move(other.name);
                value = other.value;
                data = std::move(other.data);
            }
            return *this;
        }

        bool
        operator==(ComplexObservable const& other) const
        {
            return name == other.name && value == other.value && data == other.data;
        }

        ComplexObservable&
        operator=(ComplexObservable const& other)
        {
            if (this != &other) {
                name = other.name;
                value = other.value;
                data = other.data;
            }
            return *this;
        }
    };

    static_assert(Observable<ComplexObservable>);

    ComplexObservable initial{"test", 42, {1, 2, 3}};
    ObservableValue<ComplexObservable> obs{std::move(initial)};

    testing::StrictMock<testing::MockFunction<void(ComplexObservable const&)>> mockObserver;
    auto connection = obs.observe(mockObserver.AsStdFunction());

    ComplexObservable const newValue{"changed", 100, {4, 5, 6}};
    EXPECT_CALL(
        mockObserver,
        Call(
            testing::AllOf(
                testing::Field(&ComplexObservable::name, "changed"),
                testing::Field(&ComplexObservable::value, 100),
                testing::Field(&ComplexObservable::data, std::vector<int>({4, 5, 6}))
            )
        )
    );
    obs = newValue;

    ComplexObservable const sameValue{"changed", 100, {4, 5, 6}};
    obs = sameValue;  // Same value, should not notify
}

TEST_F(ObservableValueTest, ExceptionInObserver)
{
    ObservableValue<int> obs{0};

    testing::StrictMock<testing::MockFunction<void(int const&)>> goodMockObserver;
    auto goodConnection = obs.observe(goodMockObserver.AsStdFunction());

    auto throwingConnection =
        obs.observe([](int const&) { throw std::runtime_error("Observer exception"); });

    EXPECT_CALL(goodMockObserver, Call(42));
    EXPECT_THROW(obs = 42, std::runtime_error);

    // Value is still updated even when observers throw
    EXPECT_EQ(obs.get(), 42);
}

TEST_F(ObservableValueTest, GuardExceptionSafety)
{
    ObservableValue<int> obs{10};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(20));
    try {
        auto guard = obs.operator->();
        int& ref = guard;
        ref = 20;
        throw std::runtime_error("Test exception");
    } catch (...) {
        [[maybe_unused]] auto nothing = true;
    }

    EXPECT_EQ(obs.get(), 20);
}

TEST_F(ObservableValueTest, ComprehensiveIntegrationTest)
{
    ObservableValue<std::string> obs{"start"};

    testing::StrictMock<testing::MockFunction<void(std::string const&)>> mockObserver1;
    testing::StrictMock<testing::MockFunction<void(std::string const&)>> mockObserver2;
    auto conn1 = obs.observe(mockObserver1.AsStdFunction());
    auto conn2 = obs.observe(mockObserver2.AsStdFunction());

    EXPECT_CALL(mockObserver1, Call("first"));
    EXPECT_CALL(mockObserver2, Call("first"));
    obs = "first";

    EXPECT_CALL(mockObserver1, Call("second"));
    EXPECT_CALL(mockObserver2, Call("second"));
    obs.set("second");

    obs = "second";  // Same value, should not notify

    EXPECT_CALL(mockObserver1, Call("third"));
    EXPECT_CALL(mockObserver2, Call("third"));
    {
        auto guard = obs.operator->();
        std::string& ref = guard;
        ref = "third";
    }

    conn1.disconnect();
    EXPECT_CALL(mockObserver2, Call("fourth"));
    obs = "fourth";

    EXPECT_EQ(obs.get(), "fourth");
    EXPECT_TRUE(obs.hasObservers());

    conn2.disconnect();
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, RegularConnectionPersistsAfterDestruction)
{
    ObservableValue<int> obs{0};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    {
        auto connection = obs.observe(mockObserver.AsStdFunction());
        EXPECT_CALL(mockObserver, Call(1));
        obs = 1;
    }

    EXPECT_CALL(mockObserver, Call(2));
    obs = 2;

    EXPECT_TRUE(obs.hasObservers());
}

TEST_F(ObservableValueTest, ScopedConnectionDisconnectsOnDestruction)
{
    ObservableValue<int> obs{0};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    {
        boost::signals2::scoped_connection const scoped = obs.observe(mockObserver.AsStdFunction());
        EXPECT_CALL(mockObserver, Call(1));
        obs = 1;
        EXPECT_TRUE(obs.hasObservers());
    }

    obs = 2;  // No call expected since connection was destroyed
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, ManualDisconnectWithRegularConnection)
{
    ObservableValue<int> obs{0};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(1));
    obs = 1;
    EXPECT_TRUE(obs.hasObservers());

    connection.disconnect();

    obs = 2;  // No call expected since connection was disconnected
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, ScopedConnectionCanBeDisconnectedManually)
{
    ObservableValue<int> obs{0};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    boost::signals2::scoped_connection const scoped = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(1));
    obs = 1;
    EXPECT_TRUE(obs.hasObservers());

    scoped.disconnect();

    obs = 2;  // No call expected since connection was disconnected
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, MixedConnectionTypes)
{
    ObservableValue<int> obs{0};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver1;
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver2;
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver3;

    auto regularConn = obs.observe(mockObserver1.AsStdFunction());

    {
        boost::signals2::scoped_connection const scoped1 =
            obs.observe(mockObserver2.AsStdFunction());
        boost::signals2::scoped_connection const scoped2 =
            obs.observe(mockObserver3.AsStdFunction());

        EXPECT_CALL(mockObserver1, Call(1));
        EXPECT_CALL(mockObserver2, Call(1));
        EXPECT_CALL(mockObserver3, Call(1));
        obs = 1;
        EXPECT_TRUE(obs.hasObservers());
    }

    EXPECT_CALL(mockObserver1, Call(2));
    obs = 2;  // Only mockObserver1 should be called since scoped connections were destroyed
    EXPECT_TRUE(obs.hasObservers());

    regularConn.disconnect();
    EXPECT_FALSE(obs.hasObservers());
}

TEST_F(ObservableValueTest, ForceNotify)
{
    ObservableValue<int> obs{42};
    testing::StrictMock<testing::MockFunction<void(int const&)>> mockObserver;

    obs.forceNotify();

    auto connection = obs.observe(mockObserver.AsStdFunction());

    EXPECT_CALL(mockObserver, Call(42));
    obs.forceNotify();

    EXPECT_CALL(mockObserver, Call(42));
    obs.forceNotify();

    EXPECT_CALL(mockObserver, Call(100));
    obs.set(100);
    EXPECT_CALL(mockObserver, Call(100));
    obs.forceNotify();

    EXPECT_CALL(mockObserver, Call(100)).Times(3);
    obs.forceNotify();
    obs.forceNotify();
    obs.forceNotify();
}