Added Catch2 tests, moved Age-class to own library

source/Age/Age.cpp

@@ -0,0 +1,66 @@
+#include "Age.h"
+
+#include <QDebug>
+#include <sstream>
+
+Age::Age(unsigned int years, unsigned int months)
+	: m_years(years)
+	, m_months(months)
+{
+}
+
+Age::Age(const QDate &birth, const QDate &reference)
+{
+	if (reference < birth)
+	{
+		qDebug() << "test (" << reference << ") before birth (" << birth << ")";
+		m_years = 0;
+		m_months = 0;
+
+		return;
+	}
+
+	int years = reference.year() - birth.year();
+	int months = reference.month() - birth.month();
+
+	if (months == 0 && reference.day() < birth.day())
+	{
+		months--;
+	}
+
+	if (months < 0)
+	{
+		years--;
+		months = (months + 12) % 12;
+	}
+
+	m_years = years;
+	m_months = months;
+}
+	
+bool Age::operator<(const Age &cmp) const
+{
+	if (m_years == cmp.m_years)
+	{
+		return m_months < cmp.m_months;
+	}
+
+	return m_years < cmp.m_years;
+}
+	
+unsigned int Age::years() const
+{
+	return m_years;
+}
+
+unsigned int Age::months() const
+{
+	return m_months;
+}
+ 
+std::string Age::toString() const
+{
+	std::ostringstream result;
+	result << m_years << ";" << m_months;
+	return result.str();
+}

source/Age/Age.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <QDate>
+
+class Age
+{
+private:
+	unsigned int m_years = 0;
+	unsigned int m_months = 0;
+
+public:
+	Age() = default;
+	Age(unsigned int years, unsigned int months);
+	Age(const QDate &birth, const QDate &reference);
+
+	bool operator<(const Age &cmp) const;
+
+	unsigned int years() const;
+	unsigned int months() const;
+
+	std::string toString() const;
+};

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
+)