diff --git a/sea_transport/entities/IEntity.h b/sea_transport/entities/IEntity.h
index a1dbca3..9e577c9 100644
--- a/sea_transport/entities/IEntity.h
+++ b/sea_transport/entities/IEntity.h
@@ -8,7 +8,7 @@ typedef unsigned long long entity_id;
 
 class IEntity : public ISerializable {
 public:
-   virtual entity_id id() = 0;
+   virtual entity_id id() const = 0;
 };
 
 #endif // IENTITY_H
diff --git a/sea_transport/entities/cargo_entity.cpp b/sea_transport/entities/cargo_entity.cpp
index 4a689f6..4104050 100644
--- a/sea_transport/entities/cargo_entity.cpp
+++ b/sea_transport/entities/cargo_entity.cpp
@@ -8,15 +8,15 @@ cargo_entity::cargo_entity(const QString &title, unsigned int volume) : _title(t
     }
 }
 
-entity_id cargo_entity::id() {
+entity_id cargo_entity::id() const {
     return this->_id;
 }
 
-QString cargo_entity::title() {
+QString cargo_entity::title() const {
     return this->_title;
 }
 
-unsigned int cargo_entity::volume() {
+unsigned int cargo_entity::volume() const {
     return this->_volume;
 }
 
diff --git a/sea_transport/entities/cargo_entity.h b/sea_transport/entities/cargo_entity.h
index 07d151b..8d84b3a 100644
--- a/sea_transport/entities/cargo_entity.h
+++ b/sea_transport/entities/cargo_entity.h
@@ -17,9 +17,9 @@ public:
     cargo_entity() = default;
     cargo_entity(const QString &title, unsigned int volume);
 
-    entity_id id();
-    QString title();
-    unsigned int volume();
+    entity_id id() const;
+    QString title() const;
+    unsigned int volume() const;
 
     void serialize(QDataStream &output);
     void deserialize(QDataStream &input);
diff --git a/sea_transport/entities/dpoint_entity.cpp b/sea_transport/entities/dpoint_entity.cpp
index 2a2d48d..abc256a 100644
--- a/sea_transport/entities/dpoint_entity.cpp
+++ b/sea_transport/entities/dpoint_entity.cpp
@@ -8,11 +8,11 @@ dpoint_entity::dpoint_entity(const QString &title) : _title(title) {
     }
 }
 
-entity_id dpoint_entity::id() {
+entity_id dpoint_entity::id() const {
     return this->_id;
 }
 
-QString dpoint_entity::title() {
+QString dpoint_entity::title() const {
     return this->_title;
 }
 
diff --git a/sea_transport/entities/dpoint_entity.h b/sea_transport/entities/dpoint_entity.h
index 23aebb6..037f8ff 100644
--- a/sea_transport/entities/dpoint_entity.h
+++ b/sea_transport/entities/dpoint_entity.h
@@ -19,8 +19,8 @@ public:
     dpoint_entity() = default;
     dpoint_entity(const QString &title);
 
-    entity_id id();
-    QString title();
+    entity_id id() const;
+    QString title() const;
     const QVector<storage_entity> storages();
 
     void serialize(QDataStream &output);
diff --git a/sea_transport/entities/storage_entity.cpp b/sea_transport/entities/storage_entity.cpp
index 3e9aae3..5e55f4c 100644
--- a/sea_transport/entities/storage_entity.cpp
+++ b/sea_transport/entities/storage_entity.cpp
@@ -8,11 +8,11 @@ storage_entity::storage_entity(unsigned int capacity) : _capacity(capacity) {
 }
 
 
-entity_id storage_entity::id() {
+entity_id storage_entity::id() const {
     return this->_id;
 }
 
-unsigned int storage_entity::capacity() {
+unsigned int storage_entity::capacity() const {
     return this->_capacity;
 }
 
diff --git a/sea_transport/entities/storage_entity.h b/sea_transport/entities/storage_entity.h
index 0bc9f61..3b8abf5 100644
--- a/sea_transport/entities/storage_entity.h
+++ b/sea_transport/entities/storage_entity.h
@@ -20,8 +20,8 @@ public:
     storage_entity() = default;
     storage_entity(unsigned int capacity);
 
-    entity_id id();
-    unsigned int capacity();
+    entity_id id() const;
+    unsigned int capacity() const;
     const QVector<cargo_entity> cargo();
 
     void add_cargo(cargo_entity object, bool &success);
diff --git a/sea_transport/entities/user_entity.cpp b/sea_transport/entities/user_entity.cpp
index 4a84f67..5cd56a7 100644
--- a/sea_transport/entities/user_entity.cpp
+++ b/sea_transport/entities/user_entity.cpp
@@ -4,15 +4,15 @@ user_entity::user_entity(const QString &login, const QString &password, UserRole
     this->_pwd_hash = QCryptographicHash::hash(password.toLocal8Bit(), QCryptographicHash::Sha3_256);
 }
 
-entity_id user_entity::id() {
+entity_id user_entity::id() const {
     return this->_id;
 }
 
-const QString user_entity::login() {
+const QString user_entity::login() const {
     return this->_login;
 }
 
-UserRole user_entity::role() {
+UserRole user_entity::role() const {
     return this->_role;
 }
 
diff --git a/sea_transport/entities/user_entity.h b/sea_transport/entities/user_entity.h
index 3926527..890279c 100644
--- a/sea_transport/entities/user_entity.h
+++ b/sea_transport/entities/user_entity.h
@@ -23,9 +23,9 @@ public:
     user_entity() = default;
     user_entity(const QString &login, const QString &password, UserRole role);
 
-    entity_id id();
-    const QString login();
-    UserRole role();
+    entity_id id() const;
+    const QString login() const;
+    UserRole role() const;
     bool verify_password(const QString &password) const;
 
     void serialize(QDataStream &output);
diff --git a/sea_transport/entities/vessel_entity.cpp b/sea_transport/entities/vessel_entity.cpp
index 9dc49aa..b4ccdc7 100644
--- a/sea_transport/entities/vessel_entity.cpp
+++ b/sea_transport/entities/vessel_entity.cpp
@@ -7,15 +7,15 @@ vessel_entity::vessel_entity(const dpoint_entity &harbor, unsigned int capacity)
     this->_id = ++vessel_entity::__global_id;
 }
 
-entity_id vessel_entity::id() {
+entity_id vessel_entity::id() const {
     return this->_id;
 }
 
-const dpoint_entity vessel_entity::harbor() {
+const dpoint_entity vessel_entity::harbor() const {
     return this->_harbor;
 }
 
-unsigned int vessel_entity::capacity() {
+unsigned int vessel_entity::capacity() const {
     return this->_capacity;
 }
 
diff --git a/sea_transport/entities/vessel_entity.h b/sea_transport/entities/vessel_entity.h
index 9a28810..f381f37 100644
--- a/sea_transport/entities/vessel_entity.h
+++ b/sea_transport/entities/vessel_entity.h
@@ -19,9 +19,9 @@ public:
     vessel_entity() = default;
     vessel_entity(const dpoint_entity &harbor, unsigned int capacity);
 
-    entity_id id();
-    const dpoint_entity harbor();
-    unsigned int capacity();
+    entity_id id() const;
+    const dpoint_entity harbor() const;
+    unsigned int capacity() const;
     const QVector<cargo_entity> cargo();
 
     void serialize(QDataStream &output);
diff --git a/sea_transport/system/apparatus.cpp b/sea_transport/system/apparatus.cpp
index 409037d..43747f5 100644
--- a/sea_transport/system/apparatus.cpp
+++ b/sea_transport/system/apparatus.cpp
@@ -4,16 +4,9 @@
 apparatus *apparatus::_instance = nullptr;
 const QString apparatus::filename = "data.bin";
 
-void apparatus::open_reading_stream() {
+void apparatus::open_stream() {
     this->_bin_file = new QFile(apparatus::filename);
-    this->_bin_file->open(QIODevice::ReadOnly);
-
-    stream.setDevice(_bin_file);
-}
-
-void apparatus::open_writing_stream() {
-    this->_bin_file = new QFile(apparatus::filename);
-    this->_bin_file->open(QIODevice::WriteOnly);
+    this->_bin_file->open(QIODevice::ReadWrite);
 
     stream.setDevice(_bin_file);
 }
@@ -27,35 +20,27 @@ void apparatus::close_stream() {
 }
 
 apparatus::apparatus() {
-    this->open_reading_stream();
-    this->loadGIDS();
-    this->deserialize_data();
-    this->close_stream();
+
 }
 
 apparatus::~apparatus() {
-    if (this->_bin_file) {
-        this->_bin_file->flush();
-        this->_bin_file->close();
-        delete this->_bin_file;
-        this->_bin_file = nullptr;
-    }
+    this->shutdown();
 }
 
-apparatus& apparatus::instance() {
+apparatus* apparatus::instance() {
     if (apparatus::_instance == nullptr) {
-        apparatus::init();
+        throw std::runtime_error("System non initialized!");
     }
 
-    return *apparatus::_instance;
+    return apparatus::_instance;
 }
 
 bool apparatus::isFirstRun() {
-    return QFile(apparatus::filename).exists();
+    return QFile().exists("init");
 }
 
 void apparatus::generate_empty_data() {
-    this->open_writing_stream();
+    this->open_stream();
     this->writeGIDS();
     this->serialize_data();
     this->close_stream();
@@ -71,15 +56,18 @@ const object_system& apparatus::get_object_subsystem() {
 
 void apparatus::init() {
     apparatus::_instance = new apparatus();
+
+    apparatus::instance()->open_stream();
+    apparatus::instance()->loadGIDS();
+    apparatus::instance()->deserialize_data();
+    apparatus::instance()->close_stream();
 }
 
 void apparatus::shutdown() {
-    if (apparatus::_instance != nullptr) {
-        apparatus::_instance->open_writing_stream();
-        apparatus::_instance->writeGIDS();
-        apparatus::_instance->serialize_data();
-        apparatus::_instance->close_stream();
-    }
+    apparatus::instance()->open_stream();
+    apparatus::instance()->writeGIDS();
+    apparatus::instance()->serialize_data();
+    apparatus::instance()->close_stream();
 }
 
 void apparatus::writeGIDS() {
@@ -101,6 +89,7 @@ void apparatus::serialize_data() {
 }
 
 void apparatus::deserialize_data() {
+    QFile("init").open(QIODevice::ReadWrite);
     this->_auth_system.shutdown(this->stream);
     this->_object_system.shutdown(this->stream);
 }
diff --git a/sea_transport/system/apparatus.h b/sea_transport/system/apparatus.h
index 6ebc132..3493115 100644
--- a/sea_transport/system/apparatus.h
+++ b/sea_transport/system/apparatus.h
@@ -4,13 +4,13 @@
 #include "auth_system.h"
 #include "object_system.h"
 
+#include "../entities/vessel_entity.h"
+#include "../entities/storage_entity.h"
+
 #include <QString>
 #include <QFile>
 #include <QDataStream>
 
-#include <entities/vessel_entity.h>
-#include <entities/storage_entity.h>
-
 
 class apparatus
 {
@@ -24,8 +24,7 @@ private:
     auth_system _auth_system;
     object_system _object_system;
 
-    void open_reading_stream();
-    void open_writing_stream();
+    void open_stream();
     void close_stream();
 
     void writeGIDS();
@@ -43,7 +42,7 @@ public:
     const auth_system& get_auth_subsystem();
     const object_system& get_object_subsystem();
 
-    static apparatus& instance();
+    static apparatus* instance();
     static void init();
     static void shutdown();
 };
diff --git a/sea_transport/system/auth_system.h b/sea_transport/system/auth_system.h
index b0f7cab..52849e1 100644
--- a/sea_transport/system/auth_system.h
+++ b/sea_transport/system/auth_system.h
@@ -3,7 +3,7 @@
 
 #include<QVector>
 
-#include <entities/user_entity.h>
+#include "../entities/user_entity.h"
 
 
 class auth_system
diff --git a/sea_transport/system/object_system.h b/sea_transport/system/object_system.h
index 9ee0f99..18285bb 100644
--- a/sea_transport/system/object_system.h
+++ b/sea_transport/system/object_system.h
@@ -3,8 +3,8 @@
 
 #include <QVector>
 
-#include <entities/dpoint_entity.h>
-#include <entities/vessel_entity.h>
+#include "../entities/dpoint_entity.h"
+#include "../entities/vessel_entity.h"
 
 
 class object_system
diff --git a/sea_transport_project.pro b/sea_transport_project.pro
index 18ba504..16d97ce 100644
--- a/sea_transport_project.pro
+++ b/sea_transport_project.pro
@@ -1,4 +1,5 @@
 TEMPLATE = subdirs
 
 SUBDIRS += \
-    sea_transport
+    sea_transport \
+    st_test
diff --git a/sea_transport_project.pro.user b/sea_transport_project.pro.user
index 06ce466..62fefe9 100644
--- a/sea_transport_project.pro.user
+++ b/sea_transport_project.pro.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.13.3, 2020-12-18T19:15:03. -->
+<!-- Written by QtCreator 4.13.3, 2020-12-18T19:53:31. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
@@ -19,7 +19,7 @@
    <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
     <value type="QString" key="language">Cpp</value>
     <valuemap type="QVariantMap" key="value">
-     <value type="QByteArray" key="CurrentPreferences">CppGlobal</value>
+     <value type="QByteArray" key="CurrentPreferences">qt2</value>
     </valuemap>
    </valuemap>
    <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.1">
@@ -65,24 +65,20 @@
     <value type="bool" key="AutoTest.Framework.QtTest">true</value>
    </valuemap>
    <valuemap type="QVariantMap" key="AutoTest.CheckStates">
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:apparatus_auth_subsystem_check">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:apparatus_data_serialization">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:apparatus_firstrun">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:apparatus_object_subsystem_check">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:auth_password_validation">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:auth_user_manipulation">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:auth_user_query">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:cargo_entity_check">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:dpoint_entity_check">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:object_manipulation">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:object_query">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:storage_entity_check">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:tests">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:user_entity_check">Checked</value>
-    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport/tests/tst_tests.cpp:vessel_entity_check">Checked</value>
+    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport_project/st_test/tst_st_test.cpp:cargo_entity_serialization_test">Checked</value>
+    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport_project/st_test/tst_st_test.cpp:dpoint_entity_serialization_test">Checked</value>
+    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport_project/st_test/tst_st_test.cpp:st_test">Checked</value>
+    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport_project/st_test/tst_st_test.cpp:storage_entity_serialization_test">Checked</value>
+    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport_project/st_test/tst_st_test.cpp:user_entity_serialization_test">Checked</value>
+    <value type="Qt::CheckState" key="C:/Users/Admin/Documents/repos/sea_transport_project/st_test/tst_st_test.cpp:vessel_entity_serialization_test">Checked</value>
    </valuemap>
    <value type="int" key="AutoTest.RunAfterBuild">0</value>
    <value type="bool" key="AutoTest.UseGlobal">true</value>
+   <valuelist type="QVariantList" key="ClangCodeModel.CustomCommandLineKey">
+    <value type="QString">-fno-delayed-template-parsing</value>
+   </valuelist>
+   <value type="bool" key="ClangCodeModel.UseGlobalConfig">true</value>
+   <value type="QString" key="ClangCodeModel.WarningConfigId">Builtin.Questionable</value>
    <valuemap type="QVariantMap" key="ClangTools">
     <value type="bool" key="ClangTools.BuildBeforeAnalysis">true</value>
     <value type="QString" key="ClangTools.DiagnosticConfig">Builtin.DefaultTidyAndClazy</value>
@@ -103,7 +99,7 @@
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">qt.qt5.5150.win64_mingw81_kit</value>
    <value type="int" key="ProjectExplorer.Target.ActiveBuildConfiguration">0</value>
    <value type="int" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
-   <value type="int" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
+   <value type="int" key="ProjectExplorer.Target.ActiveRunConfiguration">1</value>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.0">
     <value type="bool">true</value>
     <value type="int" key="EnableQmlDebugging">0</value>
@@ -336,9 +332,8 @@
     <valuelist type="QVariantList" key="CustomOutputParsers"/>
     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">sea_transport2</value>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:C:/Users/Admin/Documents/repos/sea_transport/sea_transport/sea_transport.pro</value>
-    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey">C:/Users/Admin/Documents/repos/sea_transport/sea_transport/sea_transport.pro</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:C:/Users/Admin/Documents/repos/sea_transport_project/sea_transport/sea_transport.pro</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey">C:/Users/Admin/Documents/repos/sea_transport_project/sea_transport/sea_transport.pro</value>
     <value type="QString" key="RunConfiguration.Arguments"></value>
     <value type="bool" key="RunConfiguration.Arguments.multi">false</value>
     <value type="QString" key="RunConfiguration.OverrideDebuggerStartup"></value>
@@ -351,7 +346,82 @@
     <value type="QString" key="RunConfiguration.WorkingDirectory"></value>
     <value type="QString" key="RunConfiguration.WorkingDirectory.default">C:/Users/Admin/Documents/repos/build-sea_transport_project-Desktop_Qt_5_15_0_MinGW_64_bit-Debug/sea_transport</value>
    </valuemap>
-   <value type="int" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
+   <valuemap type="QVariantMap" key="ProjectExplorer.Target.RunConfiguration.1">
+    <value type="QString" key="Analyzer.Perf.CallgraphMode">dwarf</value>
+    <valuelist type="QVariantList" key="Analyzer.Perf.Events">
+     <value type="QString">cpu-cycles</value>
+    </valuelist>
+    <valuelist type="QVariantList" key="Analyzer.Perf.ExtraArguments"/>
+    <value type="int" key="Analyzer.Perf.Frequency">250</value>
+    <valuelist type="QVariantList" key="Analyzer.Perf.RecordArguments">
+     <value type="QString">-e</value>
+     <value type="QString">cpu-cycles</value>
+     <value type="QString">--call-graph</value>
+     <value type="QString">dwarf,4096</value>
+     <value type="QString">-F</value>
+     <value type="QString">250</value>
+    </valuelist>
+    <value type="QString" key="Analyzer.Perf.SampleMode">-F</value>
+    <value type="bool" key="Analyzer.Perf.Settings.UseGlobalSettings">true</value>
+    <value type="int" key="Analyzer.Perf.StackSize">4096</value>
+    <value type="bool" key="Analyzer.QmlProfiler.AggregateTraces">false</value>
+    <value type="bool" key="Analyzer.QmlProfiler.FlushEnabled">false</value>
+    <value type="uint" key="Analyzer.QmlProfiler.FlushInterval">1000</value>
+    <value type="QString" key="Analyzer.QmlProfiler.LastTraceFile"></value>
+    <value type="bool" key="Analyzer.QmlProfiler.Settings.UseGlobalSettings">true</value>
+    <valuelist type="QVariantList" key="Analyzer.Valgrind.AddedSuppressionFiles"/>
+    <value type="bool" key="Analyzer.Valgrind.Callgrind.CollectBusEvents">false</value>
+    <value type="bool" key="Analyzer.Valgrind.Callgrind.CollectSystime">false</value>
+    <value type="bool" key="Analyzer.Valgrind.Callgrind.EnableBranchSim">false</value>
+    <value type="bool" key="Analyzer.Valgrind.Callgrind.EnableCacheSim">false</value>
+    <value type="bool" key="Analyzer.Valgrind.Callgrind.EnableEventToolTips">true</value>
+    <value type="double" key="Analyzer.Valgrind.Callgrind.MinimumCostRatio">0.01</value>
+    <value type="double" key="Analyzer.Valgrind.Callgrind.VisualisationMinimumCostRatio">10</value>
+    <value type="bool" key="Analyzer.Valgrind.FilterExternalIssues">true</value>
+    <value type="QString" key="Analyzer.Valgrind.KCachegrindExecutable">kcachegrind</value>
+    <value type="int" key="Analyzer.Valgrind.LeakCheckOnFinish">1</value>
+    <value type="int" key="Analyzer.Valgrind.NumCallers">25</value>
+    <valuelist type="QVariantList" key="Analyzer.Valgrind.RemovedSuppressionFiles"/>
+    <value type="int" key="Analyzer.Valgrind.SelfModifyingCodeDetection">1</value>
+    <value type="bool" key="Analyzer.Valgrind.Settings.UseGlobalSettings">true</value>
+    <value type="bool" key="Analyzer.Valgrind.ShowReachable">false</value>
+    <value type="bool" key="Analyzer.Valgrind.TrackOrigins">true</value>
+    <value type="QString" key="Analyzer.Valgrind.ValgrindExecutable">valgrind</value>
+    <valuelist type="QVariantList" key="Analyzer.Valgrind.VisibleErrorKinds">
+     <value type="int">0</value>
+     <value type="int">1</value>
+     <value type="int">2</value>
+     <value type="int">3</value>
+     <value type="int">4</value>
+     <value type="int">5</value>
+     <value type="int">6</value>
+     <value type="int">7</value>
+     <value type="int">8</value>
+     <value type="int">9</value>
+     <value type="int">10</value>
+     <value type="int">11</value>
+     <value type="int">12</value>
+     <value type="int">13</value>
+     <value type="int">14</value>
+    </valuelist>
+    <valuelist type="QVariantList" key="CustomOutputParsers"/>
+    <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+    <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:C:/Users/Admin/Documents/repos/sea_transport_project/st_test/st_test.pro</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey">C:/Users/Admin/Documents/repos/sea_transport_project/st_test/st_test.pro</value>
+    <value type="QString" key="RunConfiguration.Arguments"></value>
+    <value type="bool" key="RunConfiguration.Arguments.multi">false</value>
+    <value type="QString" key="RunConfiguration.OverrideDebuggerStartup"></value>
+    <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+    <value type="bool" key="RunConfiguration.UseLibrarySearchPath">true</value>
+    <value type="bool" key="RunConfiguration.UseMultiProcess">false</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+    <value type="QString" key="RunConfiguration.WorkingDirectory"></value>
+    <value type="QString" key="RunConfiguration.WorkingDirectory.default">C:/Users/Admin/Documents/repos/build-sea_transport_project-Desktop_Qt_5_15_0_MinGW_64_bit-Debug/st_test</value>
+   </valuemap>
+   <value type="int" key="ProjectExplorer.Target.RunConfigurationCount">2</value>
   </valuemap>
  </data>
  <data>
diff --git a/st_test/st_test.pro b/st_test/st_test.pro
new file mode 100644
index 0000000..b99df5e
--- /dev/null
+++ b/st_test/st_test.pro
@@ -0,0 +1,29 @@
+QT += testlib
+QT -= gui
+
+CONFIG += qt console warn_on depend_includepath testcase
+CONFIG -= app_bundle
+
+TEMPLATE = app
+
+SOURCES +=  tst_st_test.cpp \
+            ../sea_transport/entities/cargo_entity.cpp \
+            ../sea_transport/entities/storage_entity.cpp \
+            ../sea_transport/entities/dpoint_entity.cpp \
+            ../sea_transport/entities/vessel_entity.cpp \
+            ../sea_transport/entities/user_entity.cpp \
+            ../sea_transport/system/auth_system.cpp \
+            ../sea_transport/system/object_system.cpp \
+            ../sea_transport/system/apparatus.cpp
+
+HEADERS +=  \
+            ../sea_transport/entities/ISerializable.h \
+            ../sea_transport/entities/IEntity.h \
+            ../sea_transport/entities/cargo_entity.h \
+            ../sea_transport/entities/storage_entity.h \
+            ../sea_transport/entities/dpoint_entity.h \
+            ../sea_transport/entities/vessel_entity.h \
+            ../sea_transport/entities/user_entity.h \
+            ../sea_transport/system/auth_system.h \
+            ../sea_transport/system/object_system.h \
+            ../sea_transport/system/apparatus.h
diff --git a/st_test/tst_st_test.cpp b/st_test/tst_st_test.cpp
new file mode 100644
index 0000000..8a21a9f
--- /dev/null
+++ b/st_test/tst_st_test.cpp
@@ -0,0 +1,287 @@
+#include <QtTest>
+
+#include "../sea_transport/entities/cargo_entity.h"
+#include "../sea_transport/entities/storage_entity.h"
+#include "../sea_transport/entities/dpoint_entity.h"
+#include "../sea_transport/entities/vessel_entity.h"
+#include "../sea_transport/entities/user_entity.h"
+
+#include "../sea_transport/system/apparatus.h"
+
+#include <QFile>
+#include <QDataStream>
+
+class st_test : public QObject
+{
+    Q_OBJECT
+
+public:
+    st_test();
+    ~st_test();
+
+private slots:
+    void initTestCase();
+    void cleanupTestCase();
+
+    void cargo_entity_serialization_test();
+    void storage_entity_serialization_test();
+    void dpoint_entity_serialization_test();
+    void vessel_entity_serialization_test();
+    void user_entity_serialization_test();
+
+    void user_entity_password_verification_test();
+    void apparatus_check_null_throws_error();
+    void apparatus_check_first_run();
+    void apparatus_check_auth_subsystem();
+    void apparatus_check_object_subsystem();
+};
+
+st_test::st_test() {
+
+}
+
+st_test::~st_test() {
+
+}
+
+//=================================================
+void st_test::initTestCase() {
+    QVERIFY2(
+        !QFile("data.bin").exists(),
+        "There should be no data file!"
+    );
+}
+
+void st_test::cleanupTestCase() {
+    QVERIFY2(
+        QFile("data.bin").exists(),
+        "There should be a data file!"
+    );
+    QFile().remove("data.bin");
+}
+
+//=================================================
+void st_test::cargo_entity_serialization_test() {
+    QDataStream stream;
+    cargo_entity ent1;
+    cargo_entity ent2;
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::WriteOnly);
+        stream.setDevice(&f);
+
+        ent1 = cargo_entity("test title", 256);
+        ent1.serialize(stream);
+
+        stream.setDevice(nullptr);
+    }
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::ReadOnly);
+        stream.setDevice(&f);
+
+        ent2.deserialize(stream);
+        f.remove();
+    }
+
+    QVERIFY2(
+        ent1.id() == ent2.id() && ent1.title() == ent2.title() && ent1.volume() == ent2.volume(),
+        "Cargo entity not serialized properly"
+    );
+}
+
+void st_test::storage_entity_serialization_test() {
+    QDataStream stream;
+    storage_entity ent1;
+    storage_entity ent2;
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::WriteOnly);
+        stream.setDevice(&f);
+
+        ent1 = storage_entity(128);
+        ent1.serialize(stream);
+
+        stream.setDevice(nullptr);
+    }
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::ReadOnly);
+        stream.setDevice(&f);
+
+        ent2.deserialize(stream);
+        f.remove();
+    }
+
+    QVERIFY2(
+        ent1.id() == ent2.id() && ent1.capacity() == ent2.capacity(),
+        "Storage entity not serialized properly"
+    );
+}
+
+void st_test::dpoint_entity_serialization_test() {
+    QDataStream stream;
+    dpoint_entity ent1;
+    dpoint_entity ent2;
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::WriteOnly);
+        stream.setDevice(&f);
+
+        ent1 = dpoint_entity("some_test_point");
+        ent1.serialize(stream);
+
+        stream.setDevice(nullptr);
+    }
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::ReadOnly);
+        stream.setDevice(&f);
+
+        ent2.deserialize(stream);
+        f.remove();
+    }
+
+    QVERIFY2(
+        ent1.id() == ent2.id() && ent1.title() == ent2.title(),
+        "Delivery Point entity not serialized properly"
+    );
+}
+
+void st_test::vessel_entity_serialization_test() {
+    QDataStream stream;
+    vessel_entity ent1;
+    vessel_entity ent2;
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::WriteOnly);
+        stream.setDevice(&f);
+
+        dpoint_entity test_harbor("test_harbor_for_vessel");
+        ent1 = vessel_entity(test_harbor, 256);
+        ent1.serialize(stream);
+
+        stream.setDevice(nullptr);
+    }
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::ReadOnly);
+        stream.setDevice(&f);
+
+        ent2.deserialize(stream);
+        f.remove();
+    }
+
+    QVERIFY2(
+        ent1.id() == ent2.id() && ent1.harbor().id() == ent2.harbor().id() && ent1.capacity() == ent2.capacity(),
+        "Delivery Point entity not serialized properly"
+    );
+}
+
+void st_test::user_entity_serialization_test() {
+    QDataStream stream;
+    user_entity ent1;
+    user_entity ent2;
+    QString test_password = "test_password";
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::WriteOnly);
+        stream.setDevice(&f);
+
+        ent1 = user_entity("test_login", test_password, UserRole::ADMINISTRATOR);
+        ent1.serialize(stream);
+
+        stream.setDevice(nullptr);
+    }
+
+    {
+        QFile f("test_file.dat");
+        f.open(QIODevice::ReadOnly);
+        stream.setDevice(&f);
+
+        ent2.deserialize(stream);
+        f.remove();
+    }
+
+    QVERIFY2(
+        ent1.id() == ent2.id() && ent1.id() == ent2.id() && ent1.role() == ent2.role() && ent2.verify_password(test_password),
+        "User entity not serialized properly"
+    );
+}
+
+//=================================================
+void st_test::user_entity_password_verification_test() {
+    QString test_password = "test_password";
+    QString wrong_password = "wrong_password";
+    user_entity ent1("test_login", test_password, UserRole::ADMINISTRATOR);
+
+    QVERIFY2(
+        ent1.verify_password(test_password) || ent1.verify_password(wrong_password),
+        "Password verification failed!"
+    );
+}
+
+void st_test::apparatus_check_null_throws_error() {
+    QVERIFY_EXCEPTION_THROWN(apparatus::instance(), std::runtime_error);
+}
+
+void st_test::apparatus_check_first_run() {
+    apparatus::init();
+    QVERIFY2(
+        apparatus::instance()->isFirstRun(),
+        "Not a first run!"
+    );
+    apparatus::shutdown();
+}
+
+void st_test::apparatus_check_auth_subsystem() {
+    apparatus::init();
+    auth_system as = apparatus::instance()->get_auth_subsystem();
+    {
+        bool test = as.register_user("testor", "passwd", UserRole::ADMINISTRATOR);
+        QVERIFY(test);
+    }
+    {
+        bool test;
+        as.get_user("testor", test);
+        QVERIFY(test);
+    }
+    {
+        bool test = as.remove_user("testor");
+        QVERIFY(test);
+    }
+    apparatus::shutdown();
+}
+
+void st_test::apparatus_check_object_subsystem() {
+    apparatus::init();
+    object_system os = apparatus::instance()->get_object_subsystem();
+    dpoint_entity p("test");
+    {
+        bool test = os.add_dpoint(p);
+        QVERIFY(test);
+    }
+    {
+        bool test;
+        os.get_dpoint(p.id(), test);
+        QVERIFY(test);
+    }
+    {
+        bool test = os.remove_dpoint(p.id());
+        QVERIFY(test);
+    }
+    apparatus::shutdown();
+}
+
+QTEST_APPLESS_MAIN(st_test)
+
+#include "tst_st_test.moc"