Method load

test/test.cpp:96–101

        using PluginLoaderMock::PluginLoaderMock;

        void load() noexcept override
        {
            PluginLoader::current_loader = this;
            instance_ = make_unique<PluginInstanceMock>();
            emit finished({});
        }
        void unload() noexcept override
        {
            instance_.reset();