Merge pull request 'Base implementation' (#1) from base-impl into master

Reviewed-on: #1

.gitignore

@@ -4,8 +4,9 @@
 !/docs
 !/include
 !/src
+!/tests
 
 # Include files
 !/.gitignore
 !/CMakeLists.txt
-
+!/Makefile

CMakeLists.txt

@@ -3,10 +3,52 @@ project(magic_scrolls)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+find_package(SQLite3 REQUIRED)
+
 file(GLOB_RECURSE sources
   "${CMAKE_SOURCE_DIR}/src/*.cpp")
 
 add_executable(magic_scrolls ${sources})
 
 target_include_directories(magic_scrolls PUBLIC "${CMAKE_SOURCE_DIR}/include")
+target_link_libraries(magic_scrolls PRIVATE SQLite::SQLite3)
 
+# -------
+enable_testing()
+
+add_executable(event_bus_test
+  tests/engine/event_bus_test.cpp
+  src/engine/core/event_bus.cpp
+)
+add_executable(db_provider_test
+  tests/engine/db_provider_test.cpp
+  src/engine/core/engine.cpp
+  src/engine/core/engine_db_provider.cpp
+)
+add_executable(engine_test
+  tests/engine/engine_test.cpp
+  src/engine/core/engine.cpp
+  src/engine/core/engine_db_provider.cpp
+)
+
+target_include_directories(event_bus_test PUBLIC "${CMAKE_SOURCE_DIR}/include")
+target_link_libraries(event_bus_test PRIVATE SQLite::SQLite3)
+
+target_include_directories(db_provider_test PUBLIC "${CMAKE_SOURCE_DIR}/include")
+target_link_libraries(db_provider_test PRIVATE SQLite::SQLite3)
+
+target_include_directories(engine_test PUBLIC "${CMAKE_SOURCE_DIR}/include")
+target_link_libraries(engine_test PRIVATE SQLite::SQLite3)
+
+add_test(
+  NAME "Event Bus"
+  COMMAND event_bus_test
+)
+add_test(
+  NAME "Database Provider"
+  COMMAND db_provider_test
+)
+add_test(
+  NAME "Engine"
+  COMMAND engine_test
+)

Makefile

@@ -0,0 +1,8 @@
+.PHONY: build test
+
+build:
+	cmake -B build
+	cmake --build build
+
+test:
+	ctest --test-dir build --output-on-failure --progress

include/engine/core/engine.hpp

@@ -1,17 +1,20 @@
 #ifndef __MCS_ENGINE_HPP__
 #define __MCS_ENGINE_HPP__
 
-#include "engine/core/engine_module.hpp"
+#include <engine/core/engine_module.hpp>
-#include "engine/core/engine_module_api.hpp"
+#include <engine/core/engine_module_api.hpp>
+#include <engine/core/engine_db_provider.hpp>
 #include <cstdint>
 #include <memory>
 #include <vector>
 
 /// Magic Srolls engine core
-class MscEngine : public IMscEngineModuleAPI {
+class MscEngine : public IMscEngineModuleAPI
+{
 private:
   /// Loaded modules list
   std::vector<std::shared_ptr<MscEngineModule>> _modules;
+  MscEventBus _bus;
 
 public:
   /// Actual version
@@ -19,8 +22,11 @@ public:
 
   MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules);
 
-  UNIMPL getBus() const override;
+  MscEventBus &getBus() override;
-  UNIMPL getLoadedModules() const override;
+  std::unordered_map<std::string, std::uint16_t> getLoadedModules() const override;
+  MscEngineModule &getModule(const std::string &name) override;
+  std::unique_ptr<MscEngineDBProvider> createDBProvider() override;
+  std::unique_ptr<MscEngineDBProvider> createDBProvider(const std::string &filepath) override;
 };
 
 #endif // __MCS_ENGINE_HPP__

include/engine/core/engine_bus.hpp

@@ -0,0 +1,82 @@
+#ifndef __MSC_ENGINE_BUS_HPP__
+#define __MSC_ENGINE_BUS_HPP__
+
+#include <string>
+#include <vector>
+#include <mutex>
+#include <unordered_map>
+#include <functional>
+#include <cstdint>
+
+/// @brief Event base class
+class MscEvent
+{
+public:
+    virtual ~MscEvent() = default;
+
+    /// @brief Get event name
+    virtual std::string getName() const = 0;
+
+    /// @brief Is current event is canceled
+    bool isCanceled() const
+    {
+        return canceled;
+    }
+
+    /// @brief Cancel current event
+    void cancel()
+    {
+        canceled = true;
+    }
+
+private:
+    bool canceled = false;
+};
+
+/// @brief Engine event bus
+class MscEventBus
+{
+public:
+    /// @brief Event handler alias
+    using Listener = std::function<void(MscEvent &)>;
+
+    /// @brief Subscription identifier alias
+    using SubscriptionId = std::uint64_t;
+
+    /// @brief Emit event
+    /// @param event event context
+    void publish(MscEvent &event);
+
+    /// @brief Subscribe to specified event
+    /// @param name event name
+    /// @param listener event handler
+    /// @returns subscription identifier to make it possitble to remove listener
+    SubscriptionId subscribe(const std::string &name, Listener listener);
+
+    /// @brief Subscribe to specified event and execute once on publish
+    /// @param name event name
+    /// @param listener event handler
+    SubscriptionId subscribeOnce(const std::string &name, Listener listener);
+
+    /// @brief Unsubscribe listener by its own id
+    /// @param id subscription id
+    /// @return `true` if listener has been deleted, otherwise `false`
+    bool unsubscribe(SubscriptionId id);
+
+private:
+    using ListenerWithId = struct
+    {
+        SubscriptionId id;
+        Listener listener;
+        bool once;
+    };
+
+    std::unordered_map<std::string, std::vector<ListenerWithId>> _listeners;
+    std::unordered_map<SubscriptionId, std::string> _listenersPaths;
+    std::uint64_t _lastId = 0;
+    std::mutex _listenersMutex;
+
+    SubscriptionId _subscribe(const std::string &name, Listener listener, bool once);
+};
+
+#endif // __MSC_ENGINE_BUS_HPP__

include/engine/core/engine_db_provider.hpp

@@ -0,0 +1,30 @@
+#ifndef __MSC_ENGINE_DB_PROVIDER_HPP__
+#define __MSC_ENGINE_DB_PROVIDER_HPP__
+
+#include <sqlite3.h>
+#include <string>
+
+/// @brief Engine database provider
+class MscEngineDBProvider
+{
+public:
+    ~MscEngineDBProvider();
+
+    /// @brief Create inmemory database
+    MscEngineDBProvider();
+
+    /// @brief Create file database
+    explicit MscEngineDBProvider(const std::string &filepath);
+
+    /// @brief Execute SQL statement
+    /// @param sql statement
+    void execute(const std::string &sql);
+
+    MscEngineDBProvider(const MscEngineDBProvider &) = delete;
+    MscEngineDBProvider &operator=(const MscEngineDBProvider &) = delete;
+
+private:
+    sqlite3 *_db = nullptr;
+};
+
+#endif // __MSC_ENGINE_DB_PROVIDER_HPP__

include/engine/core/engine_module.hpp

@@ -2,12 +2,14 @@
 #define __MCS_ENGINE_MODULE_HPP__
 
 #include "engine/utils/rev_range.hpp"
+#include "engine/core/engine_module_api.hpp"
 #include <cstdint>
 #include <string>
 #include <unordered_map>
 
 /// Engine module base class
-class MscEngineModule {
+class MscEngineModule
+{
 public:
   virtual ~MscEngineModule() = default;
 
@@ -22,7 +24,7 @@ public:
   getDependencies() const = 0;
 
   /// Module initialization phase
-  virtual void onInitialize();
+  virtual void onInitialize(IMscEngineModuleAPI &engine) = 0;
 };
 
 #endif // __MCS_ENGINE_MODULE_HPP__

include/engine/core/engine_module_api.hpp

@@ -1,17 +1,34 @@
 #ifndef __MSC_ENGINE_MODULE_API_HPP__
 #define __MSC_ENGINE_MODULE_API_HPP__
 
-typedef void UNIMPL;
+#include <engine/core/engine_bus.hpp>
+#include <engine/core/engine_db_provider.hpp>
+#include <cstdint>
+#include <string>
+#include <unordered_map>
+#include <memory>
 
-class IMscEngineModuleAPI {
+class MscEngineModule;
+
+class IMscEngineModuleAPI
+{
 public:
   virtual ~IMscEngineModuleAPI() = default;
 
-  /// Get access to engine event bus
+  /// @brief Get access to engine event bus
-  virtual UNIMPL getBus() const = 0;
+  virtual MscEventBus &getBus() = 0;
 
-  /// Get access to loaded module list
+  /// @brief Get access to loaded module list
-  virtual UNIMPL getLoadedModules() const = 0;
+  virtual std::unordered_map<std::string, std::uint16_t> getLoadedModules() const = 0;
+
+  /// @brief Access module by its name
+  virtual MscEngineModule &getModule(const std::string &name) = 0;
+
+  /// @brief Create database provider with in-memory database
+  virtual std::unique_ptr<MscEngineDBProvider> createDBProvider() = 0;
+
+  /// @brief Create database provider with file database
+  virtual std::unique_ptr<MscEngineDBProvider> createDBProvider(const std::string &filepath) = 0;
 };
 
 #endif // __MSC_ENGINE_MODULE_API_HPP__

include/engine/modules/test1/test1.hpp

@@ -2,9 +2,11 @@
 #define __MSC_TEST_1_MODULE_HPP__
 
 #include "engine/core/engine_module.hpp"
+#include "engine/core/engine_module_api.hpp"
 #include <cstdint>
 
-class Test1Module : public MscEngineModule {
+class Test1Module : public MscEngineModule
+{
 public:
   ~Test1Module() = default;
 
@@ -13,7 +15,7 @@ public:
   const std::unordered_map<std::string, MscRevisionRange> &
   getDependencies() const override;
 
-  void onInitialize() override;
+  void onInitialize(IMscEngineModuleAPI &engine) override;
 };
 
 #endif // __MSC_TEST_1_MODULE_HPP__

include/engine/utils/rev_range.hpp

@@ -2,12 +2,14 @@
 #define __MSC_REV_RANGE_HPP__
 
 #include <cstdint>
-struct MscRevisionRange {
+struct MscRevisionRange
+{
   uint16_t minRevision;
   uint16_t maxRevision;
 
   /// Check provided revision to be in range
-  bool isSatisfied(uint16_t rev) const {
+  bool isSatisfied(uint16_t rev) const
+  {
     return rev >= this->minRevision && rev <= this->maxRevision;
   }
 };

src/engine/core/engine.cpp

@@ -8,33 +8,40 @@
 
 uint16_t MscEngine::REV = 0;
 
-MscEngine::MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules) {
+MscEngine::MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules)
+{
   std::unordered_map<std::string, uint16_t> registry;
-  for (const auto &module : modules) {
+  for (const auto &module : modules)
+  {
     if (!module)
       continue;
 
     auto [it, inserted] =
         registry.try_emplace(module->getName(), module->getRev());
-    if (!inserted) {
+    if (!inserted)
+    {
       throw std::runtime_error("Duplicate module detected: " +
                                module->getName());
     }
   }
 
-  for (const auto &module : modules) {
+  for (const auto &module : modules)
+  {
     if (!module)
       continue;
 
-    for (const auto &[dep_name, range] : module->getDependencies()) {
+    for (const auto &[dep_name, range] : module->getDependencies())
+    {
       auto it = registry.find(dep_name);
-      if (it == registry.end()) {
+      if (it == registry.end())
+      {
         throw std::runtime_error("Module " + module->getName() +
                                  " requires missing module: " + dep_name);
       }
 
       int current_rev = it->second;
-      if (!range.isSatisfied(current_rev)) {
+      if (!range.isSatisfied(current_rev))
+      {
         throw std::runtime_error(
             "Module " + module->getName() + " requires " + dep_name +
             " in range [" + std::to_string(range.minRevision) + " <-> " +
@@ -47,8 +54,43 @@ MscEngine::MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules) {
   _modules = std::move(modules);
 }
 
-UNIMPL MscEngine::getBus() const { throw std::runtime_error("Unimplemented"); }
+MscEventBus &MscEngine::getBus()
+{
+  return _bus;
+}
 
-UNIMPL MscEngine::getLoadedModules() const {
+std::unordered_map<std::string, std::uint16_t> MscEngine::getLoadedModules() const
-  throw std::runtime_error("Unimplemented");
+{
+  std::unordered_map<std::string, std::uint16_t> result;
+  for (const auto &module : _modules)
+  {
+    if (!module)
+      continue;
+
+    auto mod = module.get();
+    result[mod->getName()] = mod->getRev();
+  }
+
+  return result;
+}
+
+MscEngineModule &MscEngine::getModule(const std::string &name)
+{
+  for (auto &module : _modules)
+  {
+    if (module.get()->getName() == name)
+      return *module.get();
+  }
+
+  throw std::runtime_error("Module not found: " + name);
+}
+
+std::unique_ptr<MscEngineDBProvider> MscEngine::createDBProvider()
+{
+  return std::make_unique<MscEngineDBProvider>();
+}
+
+std::unique_ptr<MscEngineDBProvider> MscEngine::createDBProvider(const std::string &filepath)
+{
+  return std::make_unique<MscEngineDBProvider>(filepath);
 }

src/engine/core/engine_db_provider.cpp

@@ -0,0 +1,45 @@
+#include <engine/core/engine_db_provider.hpp>
+#include <stdexcept>
+
+MscEngineDBProvider::MscEngineDBProvider() : MscEngineDBProvider(":memory:")
+{
+}
+
+MscEngineDBProvider::MscEngineDBProvider(const std::string &filepath)
+{
+    const int result = sqlite3_open(filepath.c_str(), &_db);
+    if (result != SQLITE_OK)
+    {
+        const std::string message = _db != nullptr
+                                        ? sqlite3_errmsg(_db)
+                                        : "unknown SQLite error";
+
+        if (_db != nullptr)
+        {
+            sqlite3_close(_db);
+            _db = nullptr;
+        }
+
+        throw std::runtime_error("Failed to open SQLite database: " + message);
+    }
+}
+
+MscEngineDBProvider::~MscEngineDBProvider()
+{
+    if (_db != nullptr)
+        sqlite3_close(_db);
+}
+
+void MscEngineDBProvider::execute(const std::string &sql)
+{
+    char *errorMessage = nullptr;
+    const int result = sqlite3_exec(_db, sql.c_str(), nullptr, nullptr, &errorMessage);
+
+    if (result == SQLITE_OK)
+        return;
+
+    std::string message(errorMessage);
+    sqlite3_free(errorMessage);
+
+    throw std::runtime_error("Failed to execute SQL: " + message);
+}

src/engine/core/event_bus.cpp

@@ -0,0 +1,80 @@
+#include <engine/core/engine_bus.hpp>
+#include <utility>
+#include <cstddef>
+
+void MscEventBus::publish(MscEvent &event)
+{
+    std::vector<ListenerWithId> listeners;
+
+    {
+        std::lock_guard<std::mutex> lock(_listenersMutex);
+        auto it = _listeners.find(event.getName());
+        if (it == _listeners.end())
+            return;
+
+        for (const auto &entry : it->second)
+            listeners.push_back(entry);
+    }
+
+    for (const auto &entry : listeners)
+    {
+        if (event.isCanceled())
+            break;
+
+        entry.listener(event);
+        if (entry.once)
+            unsubscribe(entry.id);
+    }
+}
+
+MscEventBus::SubscriptionId MscEventBus::_subscribe(const std::string &name, MscEventBus::Listener listener, bool once)
+{
+    std::lock_guard<std::mutex> lock(_listenersMutex);
+
+    const SubscriptionId id = ++_lastId;
+    auto listenerWithId = ListenerWithId{
+        .id = id,
+        .listener = std::move(listener),
+        .once = once};
+
+    _listeners[name].push_back(std::move(listenerWithId));
+    _listenersPaths[id] = name;
+
+    return id;
+}
+
+MscEventBus::SubscriptionId MscEventBus::subscribe(const std::string &name, Listener listener)
+{
+    return _subscribe(name, std::move(listener), false);
+}
+
+MscEventBus::SubscriptionId MscEventBus::subscribeOnce(const std::string &name, Listener listener)
+{
+    return _subscribe(name, std::move(listener), true);
+}
+
+bool MscEventBus::unsubscribe(SubscriptionId id)
+{
+    std::lock_guard<std::mutex> lock(_listenersMutex);
+
+    auto it = _listenersPaths.find(id);
+    if (it == _listenersPaths.end())
+        return false;
+
+    auto &listeners = _listeners.at(it->second);
+    for (std::size_t i = 0; i < listeners.size(); i++)
+    {
+        if (listeners.at(i).id != id)
+            continue;
+
+        listeners.erase(listeners.begin() + i);
+        _listenersPaths.erase(id);
+
+        if (listeners.empty())
+            _listeners.erase(it->second);
+
+        return true;
+    }
+
+    return false;
+}

src/engine/modules/test1/test1.hpp

@@ -1,4 +1,5 @@
 #include "engine/modules/test1/test1.hpp"
+#include "engine/core/engine_module_api.hpp"
 #include "engine/utils/rev_range.hpp"
 #include <cstdint>
 #include <string>
@@ -9,9 +10,13 @@ std::string Test1Module::getName() const { return "test1"; }
 uint16_t Test1Module::getRev() const { return 1; }
 
 const std::unordered_map<std::string, MscRevisionRange> &
-Test1Module::getDependencies() const {
+Test1Module::getDependencies() const
+{
   static const std::unordered_map<std::string, MscRevisionRange> deps{};
   return deps;
 }
 
-void Test1Module::onInitialize() {}
+void Test1Module::onInitialize(IMscEngineModuleAPI &engine)
+{
+  (void)(engine);
+}

src/main.cpp

@@ -5,7 +5,8 @@
 #include <stdlib.h>
 #include <vector>
 
-int main(int argc, char **argv) {
+int main(int argc, char **argv)
+{
   auto engine =
       std::make_unique<MscEngine>(std::vector<std::shared_ptr<MscEngineModule>>{
           std::make_shared<Test1Module>()});

tests/engine/db_provider_test.cpp

@@ -0,0 +1,62 @@
+#include <cassert>
+#include <vector>
+#include <stdexcept>
+#include <engine/core/engine.hpp>
+#include <engine/core/engine_db_provider.hpp>
+
+/// @brief Проверка на создание экземпляра
+void testProviderCreation()
+{
+    MscEngine engine({});
+
+    auto dbp1 = engine.createDBProvider();
+    assert(dbp1.get() != nullptr);
+}
+
+/// @brief Проверка на создание экземпляра с некорректным путём файла
+void testIncorrectFilePath()
+{
+    MscEngine engine({});
+
+    try
+    {
+        engine.createDBProvider("/i/am/an/incorrect/path/to/file.txt");
+        assert(false);
+    }
+    catch (const std::runtime_error &error)
+    {
+    }
+}
+
+/// @brief Проверка на успешное выполнение корректного выражения
+void testValidStatement()
+{
+    MscEngine engine({});
+    auto dbp = engine.createDBProvider();
+    dbp.get()->execute("SELECT 'hello, world' AS message;");
+}
+
+void testInvalidStatement()
+{
+    MscEngine engine({});
+    auto dbp = engine.createDBProvider();
+
+    try
+    {
+        dbp.get()->execute("SELECT * FROM nonexistentdatabase ABC");
+        assert(false);
+    }
+    catch (const std::runtime_error &error)
+    {
+    }
+}
+
+int main()
+{
+    testProviderCreation();
+    testIncorrectFilePath();
+    testValidStatement();
+    testInvalidStatement();
+
+    return 0;
+}

tests/engine/engine_test.cpp

@@ -0,0 +1,149 @@
+#include <cassert>
+#include <string>
+#include <cstdint>
+#include <memory>
+#include <stdexcept>
+#include <unordered_map>
+#include <engine/utils/rev_range.hpp>
+#include <engine/core/engine.hpp>
+#include <engine/core/engine_module.hpp>
+
+class FirstTestModuleR1 : public MscEngineModule
+{
+public:
+    std::string getName() const override
+    {
+        return "first_tmod";
+    };
+
+    std::uint16_t getRev() const override
+    {
+        return 1;
+    }
+
+    const std::unordered_map<std::string, MscRevisionRange> &getDependencies() const override
+    {
+        static const std::unordered_map<std::string, MscRevisionRange> deps{};
+        return deps;
+    }
+
+    void onInitialize(IMscEngineModuleAPI &engine) override {}
+};
+
+class FirstTestModuleR2 : public MscEngineModule
+{
+public:
+    std::string getName() const override
+    {
+        return "first_tmod";
+    };
+
+    std::uint16_t getRev() const override
+    {
+        return 2;
+    }
+
+    const std::unordered_map<std::string, MscRevisionRange> &getDependencies() const override
+    {
+        static const std::unordered_map<std::string, MscRevisionRange> deps{};
+        return deps;
+    }
+
+    void onInitialize(IMscEngineModuleAPI &engine) override {}
+};
+
+class SecondTestModuleE1 : public MscEngineModule
+{
+public:
+    std::string getName() const override
+    {
+        return "second_tmod";
+    }
+
+    std::uint16_t getRev() const override
+    {
+        return 1;
+    }
+
+    const std::unordered_map<std::string, MscRevisionRange> &getDependencies() const override
+    {
+        static const std::unordered_map<std::string, MscRevisionRange> deps{
+            {"first_tmod", MscRevisionRange{1, 1}}};
+        return deps;
+    }
+
+    void onInitialize(IMscEngineModuleAPI &engine) override {}
+};
+
+class SecondTestModuleE2 : public MscEngineModule
+{
+public:
+    std::string getName() const override
+    {
+        return "second_tmod";
+    }
+
+    std::uint16_t getRev() const override
+    {
+        return 1;
+    }
+
+    const std::unordered_map<std::string, MscRevisionRange> &getDependencies() const override
+    {
+        static const std::unordered_map<std::string, MscRevisionRange> deps{
+            {"first_tmod", MscRevisionRange{1, 2}}};
+        return deps;
+    }
+
+    void onInitialize(IMscEngineModuleAPI &engine) override {}
+};
+
+void testSatisfiedModules()
+{
+    MscEngine engine({std::make_shared<FirstTestModuleR1>(),
+                      std::make_shared<SecondTestModuleE1>()});
+}
+
+void testDuplicatedModules()
+{
+    try
+    {
+        MscEngine engine({
+            std::make_shared<FirstTestModuleR1>(),
+            std::make_shared<FirstTestModuleR2>(),
+        });
+        assert(false);
+    }
+    catch (const std::runtime_error &error)
+    {
+    }
+}
+
+void testUnsatisfiedModules()
+{
+    try
+    {
+        MscEngine engine({std::make_shared<FirstTestModuleR2>(),
+                          std::make_shared<SecondTestModuleE1>()});
+        assert(false);
+    }
+    catch (const std::runtime_error &error)
+    {
+    }
+}
+
+void testSatisfiedMultiversionModule()
+{
+    MscEngine engine({std::make_shared<FirstTestModuleR2>(),
+                      std::make_shared<SecondTestModuleE2>()});
+}
+
+int main()
+{
+    testSatisfiedModules();
+    testDuplicatedModules();
+    testUnsatisfiedModules();
+    testSatisfiedMultiversionModule();
+
+    return 0;
+}

tests/engine/event_bus_test.cpp

@@ -0,0 +1,76 @@
+#include <cassert>
+#include <engine/core/engine_bus.hpp>
+
+const std::string testEventName = "TestEvent";
+int calls = 0;
+
+class TestEvent : public MscEvent
+{
+public:
+    std::string getName() const override
+    {
+        return testEventName;
+    }
+};
+
+/// @brief Проверка на работу pub-sub
+void testEventPubSub()
+{
+    calls = 0;
+    MscEventBus bus;
+    TestEvent event;
+
+    bus.subscribe(testEventName, [&](MscEvent &ev)
+                  {
+                    calls++;
+
+                    auto *testEvent = dynamic_cast<TestEvent*>(&ev);
+                    assert(testEvent != nullptr); });
+
+    bus.publish(event);
+    assert(calls == 1);
+}
+
+/// @brief Проверка на работу
+void testEventOnce()
+{
+    calls = 0;
+    MscEventBus bus;
+    TestEvent event;
+
+    bus.subscribeOnce(testEventName, [&](MscEvent &)
+                      { calls++; });
+
+    bus.publish(event);
+    bus.publish(event);
+    assert(calls == 1);
+}
+
+/// @brief Проверка работы отписки
+void testUnsubscribe()
+{
+    calls = 0;
+    MscEventBus bus;
+    TestEvent event;
+
+    auto id = bus.subscribe(testEventName, [&](MscEvent &)
+                            { calls++; });
+
+    bus.publish(event);
+
+    assert(bus.unsubscribe(id) == true);
+    assert(bus.unsubscribe(id) == false);
+
+    bus.publish(event);
+
+    assert(calls == 1);
+}
+
+int main()
+{
+    testEventPubSub();
+    testEventOnce();
+    testUnsubscribe();
+
+    return 0;
+}