diff --git a/CMakeLists.txt b/CMakeLists.txt
index d819e35..4603e7c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,3 +6,4 @@ include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
 conan_basic_setup()
 
 add_subdirectory(source)
+add_subdirectory(test)
diff --git a/conanfile.txt b/conanfile.txt
index dd246ef..7591bc8 100644
--- a/conanfile.txt
+++ b/conanfile.txt
@@ -1,5 +1,6 @@
 [requires]
 protobuf/3.6.1@bincrafters/stable
+catch2/2.4.2@bincrafters/stable
 
 [generators]
 cmake
diff --git a/source/Age.cpp b/source/Age/Age.cpp
similarity index 95%
rename from source/Age.cpp
rename to source/Age/Age.cpp
index 81415e9..05613a4 100644
--- a/source/Age.cpp
+++ b/source/Age/Age.cpp
@@ -4,8 +4,8 @@
 #include <sstream>
 
 Age::Age(unsigned int years, unsigned int months)
-	: m_years(years)
-	, m_months(months)
+    : m_years(years)
+    , m_months(months)
 {
 }
 
@@ -37,7 +37,7 @@ Age::Age(const QDate &birth, const QDate &reference)
 	m_years = years;
 	m_months = months;
 }
-	
+
 bool Age::operator<(const Age &cmp) const
 {
 	if (m_years == cmp.m_years)
@@ -47,7 +47,7 @@ bool Age::operator<(const Age &cmp) const
 
 	return m_years < cmp.m_years;
 }
-	
+
 unsigned int Age::years() const
 {
 	return m_years;
@@ -57,7 +57,7 @@ unsigned int Age::months() const
 {
 	return m_months;
 }
- 
+
 std::string Age::toString() const
 {
 	std::ostringstream result;
diff --git a/source/Age.h b/source/Age/Age.h
similarity index 100%
rename from source/Age.h
rename to source/Age/Age.h
diff --git a/source/Age/CMakeLists.txt b/source/Age/CMakeLists.txt
new file mode 100644
index 0000000..820be2c
--- /dev/null
+++ b/source/Age/CMakeLists.txt
@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.6)
+
+project(Age LANGUAGES CXX)
+
+find_package(Qt5Core REQUIRED)
+
+add_library(${PROJECT_NAME}
+	Age.cpp
+)
+
+set_target_properties(${PROJECT_NAME}
+	PROPERTIES CXX_STANDARD 14
+)
+
+target_include_directories(${PROJECT_NAME}
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(${PROJECT_NAME}
+	PUBLIC
+		Qt5::Core
+)
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index ab95560..0a0f40f 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -34,10 +34,9 @@ protobuf_generate_cpp(DataModel_PROTO_SRCS DataModel_PROTO_HDRS
 	${DataModel_PROTO_FILES})
 
 add_executable(${PROJECT_NAME} WIN32
-	LogoTest.cpp
+	ESGRAF48.cpp
 	DataModel.cpp
 	mainwindow.cpp
-	Age.cpp
 	${LOGO_TEST_UI}
 	${LOGO_TEST_QRC}
 	${DataModel_PROTO_SRCS}
@@ -57,6 +56,7 @@ target_include_directories(${PROJECT_NAME}
 
 target_link_libraries(${PROJECT_NAME}
 	PRIVATE
+		Age
 		CheckableItem
 		CheckableTest
 		CheckableTestModel
@@ -73,6 +73,7 @@ target_link_libraries(${PROJECT_NAME}
 		${Protobuf_LIBRARIES}
 )
 
+add_subdirectory(Age)
 add_subdirectory(CheckableItem)
 add_subdirectory(CheckableTest)
 add_subdirectory(CheckableTestModel)
diff --git a/source/ESGRAF48.cpp b/source/ESGRAF48.cpp
new file mode 100644
index 0000000..1f15804
--- /dev/null
+++ b/source/ESGRAF48.cpp
@@ -0,0 +1,21 @@
+#include "mainwindow.h"
+#include <QApplication>
+
+int main(int argc, char **argv)
+{
+	QApplication app(argc, argv);
+
+	std::unique_ptr<MainWindow> mainWindow;
+	if (argc < 2)
+	{
+		mainWindow = std::make_unique<MainWindow>(nullptr);
+	}
+	else
+	{
+		mainWindow = std::make_unique<MainWindow>(nullptr, argv[1]);
+	}
+
+	mainWindow->show();
+
+	return app.exec();
+}
diff --git a/source/LogoTest.cpp b/source/LogoTest.cpp
deleted file mode 100644
index 30539a1..0000000
--- a/source/LogoTest.cpp
+++ /dev/null
@@ -1,11 +0,0 @@
-#include "mainwindow.h"
-#include <QApplication>
-
-int main(int argc, char **argv)
-{
-	QApplication app(argc, argv);
-	MainWindow mainWindow;
-	mainWindow.show();
-
-	return app.exec();
-}
diff --git a/source/MetaData/CMakeLists.txt b/source/MetaData/CMakeLists.txt
index b61703a..e00d8de 100644
--- a/source/MetaData/CMakeLists.txt
+++ b/source/MetaData/CMakeLists.txt
@@ -41,6 +41,7 @@ target_include_directories(${PROJECT_NAME}
 
 target_link_libraries(${PROJECT_NAME}
 	PRIVATE
+		Age
 		Qt5::Widgets
 		${Protobuf_LIBRARIES}
 )
diff --git a/source/MetaData/MetaDataModel.h b/source/MetaData/MetaDataModel.h
index d2ebaa7..0c8bbeb 100644
--- a/source/MetaData/MetaDataModel.h
+++ b/source/MetaData/MetaDataModel.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../Age.h"
+#include "Age.h"
 
 #include "MetaDataModel.pb.h"
 
diff --git a/source/ResultWidget/CMakeLists.txt b/source/ResultWidget/CMakeLists.txt
index b85d0c1..bfdd22c 100644
--- a/source/ResultWidget/CMakeLists.txt
+++ b/source/ResultWidget/CMakeLists.txt
@@ -30,5 +30,6 @@ target_include_directories(${PROJECT_NAME}
 
 target_link_libraries(${PROJECT_NAME}
 	PRIVATE
+		Age
 		Qt5::Widgets
 )
diff --git a/source/ResultWidget/PRMap.h b/source/ResultWidget/PRMap.h
index 5ad5bcf..6d9104c 100644
--- a/source/ResultWidget/PRMap.h
+++ b/source/ResultWidget/PRMap.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../Age.h"
+#include "Age.h"
 #include <vector>
 
 class PRMap
diff --git a/source/ResultWidget/ResultModel.h b/source/ResultWidget/ResultModel.h
index 1c290f4..ae6dd78 100644
--- a/source/ResultWidget/ResultModel.h
+++ b/source/ResultWidget/ResultModel.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../Age.h"
+#include "Age.h"
 #include <QAbstractTableModel>
 
 class TestResult
diff --git a/source/mainwindow.cpp b/source/mainwindow.cpp
index 20d877a..e91549a 100644
--- a/source/mainwindow.cpp
+++ b/source/mainwindow.cpp
@@ -1,8 +1,6 @@
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 
-#include "DataModel.h"
-
 #include <QJsonObject>
 #include <QJsonDocument>
 #include <QFile>
@@ -21,16 +19,46 @@
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow)
+    , m_dataModel(this)
 {
 	ui->setupUi(this);
+	setupUi();
+
+	newFile();
+}
+
+MainWindow::MainWindow(QWidget *parent, const QString &filename)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+    , m_dataModel(this)
+{
+	ui->setupUi(this);
+	setupUi();
+
+	openFile(filename);
+}
+
+void MainWindow::setupUi()
+{
+	ui->metaDataWidget->setModel(&m_dataModel.m_metaData);
+	ui->verbEndWidget->setModel(&m_dataModel.m_verbEnd);
+	ui->genusWidget->setModel(&m_dataModel.m_genus);
+	ui->pluralWidget->setModel(&m_dataModel.m_plural);
+	ui->akkusativDativWidget->setAkkusativModel(&m_dataModel.m_akkusativ);
+	ui->akkusativDativWidget->setDativModel(&m_dataModel.m_dativ);
+	ui->v2SvkWidget->setV2SvkModel(&m_dataModel.m_v2Svk);
+	ui->lateSkillsWidget->setPassivModel(&m_dataModel.m_passiv);
+	ui->lateSkillsWidget->setGenitivModel(&m_dataModel.m_genitiv);
+	ui->resultWidget->setModel(&m_dataModel.m_results);
 
 	connect(ui->actionNew, &QAction::triggered, this, &MainWindow::newFile);
-	connect(ui->actionOpen, &QAction::triggered, this, &MainWindow::openFile);
+	connect(ui->actionOpen, &QAction::triggered, this, qOverload<>(&MainWindow::openFile));
 	connect(ui->actionSave, &QAction::triggered, this, qOverload<>(&MainWindow::saveFile));
 	connect(ui->actionSave_as, &QAction::triggered, this, &MainWindow::saveFileAs);
 	connect(ui->actionPrint, &QAction::triggered, this, &MainWindow::print);
+	connect(ui->actionExport_PDF, &QAction::triggered, this, qOverload<>(&MainWindow::savePdf));
 
-	newFile();
+	connect(&m_dataModel, &DataModel::modelChanged, this, &MainWindow::dataModelChanged);
 }
 
 MainWindow::~MainWindow()
@@ -42,21 +70,6 @@ void MainWindow::newFile()
 {
 	closeFile();
 
-	m_dataModel = std::make_unique<DataModel>(this);
-	ui->metaDataWidget->setModel(&m_dataModel->m_metaData);
-	ui->verbEndWidget->setModel(&m_dataModel->m_verbEnd);
-	ui->genusWidget->setModel(&m_dataModel->m_genus);
-	ui->pluralWidget->setModel(&m_dataModel->m_plural);
-	ui->akkusativDativWidget->setAkkusativModel(&m_dataModel->m_akkusativ);
-	ui->akkusativDativWidget->setDativModel(&m_dataModel->m_dativ);
-	ui->v2SvkWidget->setV2SvkModel(&m_dataModel->m_v2Svk);
-	ui->lateSkillsWidget->setPassivModel(&m_dataModel->m_passiv);
-	ui->lateSkillsWidget->setGenitivModel(&m_dataModel->m_genitiv);
-
-	ui->resultWidget->setModel(&m_dataModel->m_results);
-
-	connect(&*m_dataModel, &DataModel::modelChanged, this, &MainWindow::dataModelChanged);
-
 	setWindowModified(false);
 	setWindowTitle("untitled[*]");
 	m_filename = "";
@@ -72,10 +85,15 @@ void MainWindow::openFile()
 		return;
 	}
 
+	openFile(filename);
+}
+
+void MainWindow::openFile(const QString &filename)
+{
 	closeFile();
 
 	std::fstream protoInFile(filename.toStdString(), std::ios::in | std::ios::binary);
-	m_dataModel->read(protoInFile);
+	m_dataModel.read(protoInFile);
 
 	setWindowModified(false);
 	setWindowTitle(filename + "[*]");
@@ -133,7 +151,7 @@ void MainWindow::closeFile()
 void MainWindow::print() const
 {
 	//std::ofstream htmlfile("print.html");
-	//htmlfile << m_dataModel->toHtml();
+	//htmlfile << m_dataModel.toHtml();
 
 	QPrinter printer;
 
@@ -144,7 +162,7 @@ void MainWindow::print() const
 	}
 
 	QTextDocument printDoc;
-	printDoc.setHtml(QString::fromStdString(m_dataModel->toHtml()));
+	printDoc.setHtml(QString::fromStdString(m_dataModel.toHtml()));
 
 	printDoc.print(&printer);
 }
@@ -155,6 +173,22 @@ void MainWindow::dataModelChanged()
 	setWindowModified(true);
 }
 
+void MainWindow::savePdf()
+{
+	QFileDialog saveFilenameDialog(this);
+	saveFilenameDialog.setDefaultSuffix("pdf");
+	saveFilenameDialog.setFileMode(QFileDialog::AnyFile);
+	saveFilenameDialog.setNameFilter("PDF File (*.pdf)");
+	saveFilenameDialog.setWindowTitle("Save file");
+
+	if (!saveFilenameDialog.exec())
+	{
+		return;
+	}
+
+	savePdf(saveFilenameDialog.selectedFiles().first());
+}
+
 void MainWindow::closeEvent(QCloseEvent *event)
 {
 	closeFile();
@@ -164,7 +198,7 @@ void MainWindow::saveFile(const QString &filename)
 {
 	std::fstream protoOutFile(filename.toStdString(),
 	                          std::ios::out | std::ios::trunc | std::ios::binary);
-	m_dataModel->write(protoOutFile);
+	m_dataModel.write(protoOutFile);
 
 	qDebug() << "Wrote" << filename;
 
@@ -173,3 +207,16 @@ void MainWindow::saveFile(const QString &filename)
 	m_filename = filename;
 	m_saveOnClose = false;
 }
+
+void MainWindow::savePdf(const QString &filename)
+{
+	QPrinter printer;
+	printer.setOutputFormat(QPrinter::PdfFormat);
+	printer.setPaperSize(QPrinter::A4);
+	printer.setOutputFileName(filename);
+
+	QTextDocument printDoc;
+	printDoc.setHtml(QString::fromStdString(m_dataModel.toHtml()));
+
+	printDoc.print(&printer);
+}
diff --git a/source/mainwindow.h b/source/mainwindow.h
index 78fa2bb..9675fb7 100644
--- a/source/mainwindow.h
+++ b/source/mainwindow.h
@@ -1,8 +1,10 @@
 #pragma once
 
-#include <QMainWindow>
+#include "DataModel.h"
+
+#include <QMainWindow>
+#include <QString>
 
-#include <memory>
 
 class DataModel;
 class QDataWidgetMapper;
@@ -17,26 +19,31 @@ class MainWindow : public QMainWindow
 
 private:
 	Ui::MainWindow *ui;
-	std::unique_ptr<DataModel> m_dataModel;
+	DataModel m_dataModel;
 	QString m_filename;
 	bool m_saveOnClose = false;
 
 public:
-	MainWindow(QWidget *parent = nullptr);
+	MainWindow(QWidget *parent);
+	MainWindow(QWidget *parent, const QString &filename);
 	~MainWindow();
 
 public slots:
 	void newFile();
 	void openFile();
+	void openFile(const QString &filename);
 	void saveFile();
 	void saveFileAs();
 	void closeFile();
 	void print() const;
 	void dataModelChanged();
+	void savePdf();
 
 protected:
 	void closeEvent(QCloseEvent *event) override;
 
 private:
+	void setupUi();
 	void saveFile(const QString &filename);
+	void savePdf(const QString &filename);
 };
diff --git a/source/mainwindow.ui b/source/mainwindow.ui
index 86d0199..9622ce3 100644
--- a/source/mainwindow.ui
+++ b/source/mainwindow.ui
@@ -133,6 +133,7 @@
     <addaction name="actionSave_as"/>
     <addaction name="separator"/>
     <addaction name="actionPrint"/>
+    <addaction name="actionExport_PDF"/>
     <addaction name="separator"/>
     <addaction name="actionQuit"/>
    </widget>
@@ -228,6 +229,14 @@
     <string>Ctrl+P</string>
    </property>
   </action>
+  <action name="actionExport_PDF">
+   <property name="text">
+    <string>Export PDF</string>
+   </property>
+   <property name="toolTip">
+    <string>Export as PDF file</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>
diff --git a/test/Age.cpp b/test/Age.cpp
new file mode 100644
index 0000000..22b0fbb
--- /dev/null
+++ b/test/Age.cpp
@@ -0,0 +1,40 @@
+#include <catch2/catch.hpp>
+
+#include "Age.h"
+
+TEST_CASE("default initialization")
+{
+	Age age;
+	REQUIRE(age.years() == 0);
+	REQUIRE(age.months() == 0);
+	REQUIRE(age.toString() == "0;0");
+
+	Age age2;
+	REQUIRE(!(age < age));
+	REQUIRE(!(age < age2));
+}
+
+TEST_CASE("year/month initialization")
+{
+	for (unsigned int year = 0; year <= 100; ++year)
+	{
+		for (unsigned int month = 0; month < 12; ++month)
+		{
+			Age age(year, month);
+
+			REQUIRE(age.years() == year);
+			REQUIRE(age.months() == month);
+		}
+	}
+}
+
+TEST_CASE("age by reference")
+{
+	QDate birth(1970, 1, 1);
+	QDate reference(1980, 1, 1);
+
+	Age age(birth, reference);
+
+	REQUIRE(age.years() == 10);
+	REQUIRE(age.months() == 0);
+}
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..5984746
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.5)
+project(run-tests)
+
+find_package(Catch2 REQUIRED)
+
+add_executable(${PROJECT_NAME}
+	main.cpp
+	dummy.cpp
+	Age.cpp
+)
+
+target_link_libraries(${PROJECT_NAME}
+	PRIVATE
+		Catch2::Catch2
+		Age
+)
+
+include(CTest)
+include(Catch)
+catch_discover_tests(${PROJECT_NAME})
+
diff --git a/test/dummy.cpp b/test/dummy.cpp
new file mode 100644
index 0000000..0eb8941
--- /dev/null
+++ b/test/dummy.cpp
@@ -0,0 +1,7 @@
+#include <catch2/catch.hpp>
+
+TEST_CASE("Dummy")
+{
+	REQUIRE(true == true);
+}
+
diff --git a/test/main.cpp b/test/main.cpp
new file mode 100644
index 0000000..4ed06df
--- /dev/null
+++ b/test/main.cpp
@@ -0,0 +1,2 @@
+#define CATCH_CONFIG_MAIN
+#include <catch2/catch.hpp>