Add test-cases for QDate::{start,end}OfDay() at QDateTime's bounds

Task-number: QTBUG-68855
Change-Id: Ic91cb5f9947ce5ee533fc77ae24a50376e139ab3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/auto/corelib/time/qdate/tst_qdate.cpp b/tests/auto/corelib/time/qdate/tst_qdate.cpp
index 6be26bed79..ab6b8a53a9 100644
--- a/tests/auto/corelib/time/qdate/tst_qdate.cpp
+++ b/tests/auto/corelib/time/qdate/tst_qdate.cpp
@@ -518,9 +518,20 @@ void tst_QDate::startOfDay_endOfDay_data()
     constexpr MsKludges IgnoreBoth = IgnoreStart | IgnoreEnd;
     const QTimeZone UTC(QTimeZone::UTC);
 
+    using Bound = std::numeric_limits<qint64>;
+    const auto dateAtMillis = [UTC](qint64 millis) {
+        return QDateTime::fromMSecsSinceEpoch(millis, UTC).date();
+    };
+
     // UTC and fixed offset are always available and predictable:
     QTest::newRow("epoch") << epochDate() << UTC << early << late << MsKludges{};
 
+    // First and last days in QDateTime's supported range:
+    QTest::newRow("earliest")
+        << dateAtMillis(Bound::min()) << UTC << invalid << late << MsKludges{};
+    QTest::newRow("latest")
+        << dateAtMillis(Bound::max()) << UTC << early << invalid << MsKludges{};
+
     const struct {
         const char *test;
         const char *zone;