Added unit tests and qmake helper files

test/espchronotestutils.cpp

@@ -0,0 +1,52 @@
+#include "espchronotestutils.h"
+
+using namespace std::chrono_literals;
+using namespace date;
+
+const espchrono::time_zone testTimeZone{.offset=60min, .dayLightSavingMode=espchrono::DayLightSavingMode::EuropeanSummerTime};
+
+espchrono::millis_clock::time_point wallClock{};
+
+namespace QTest {
+template<>
+char *toString(const espchrono::DateTime &dateTime)
+{
+    return ::QTest::toString(espchrono::toString(dateTime));
+}
+
+template<>
+char *toString(const espchrono::LocalDateTime &dateTime)
+{
+    return ::QTest::toString(espchrono::toString(dateTime));
+}
+
+template<>
+char *toString(const espchrono::utc_clock::time_point &ts)
+{
+    return ::QTest::toString(espchrono::toDateTime(ts));
+}
+
+template<>
+char *toString(const espchrono::local_clock::time_point &ts)
+{
+    return ::QTest::toString(espchrono::toDateTime(ts));
+}
+
+template<>
+char *toString(const espchrono::seconds &val)
+{
+    return ::QTest::toString(espchrono::toDaypointString(val));
+}
+
+template<>
+char *toString(const std::optional<espchrono::seconds> &val)
+{
+    return val ? ::QTest::toString(*val) : ::QTest::toString("(invalid)");
+}
+} // namespace QTest
+
+// stub implementation to make unit tests happy
+auto espchrono::millis_clock::now() noexcept -> time_point
+{
+    return wallClock;
+}