1 files changed, 110 insertions, 0 deletions
diff --git a/tests/test_repeatrule.cpp b/tests/test_repeatrule.cpp
index 3171296..8962d14 100644
--- a/tests/test_repeatrule.cpp
+++ b/tests/test_repeatrule.cpp
@@ -23,7 +23,117 @@
 class TestRepeatRule : public QObject
 {
     Q_OBJECT
+
+private slots:
+    void roundTripsEveryRowOfTheTable_data();
+    void roundTripsEveryRowOfTheTable();
+    void fillsWhatAnRruleLeavesImplicit();
+    void recognisesACustomRule_data();
+    void recognisesACustomRule();
+    void keepsWkst();
+    void readsUntilInEveryForm();
+    void describesInWords();
 };
 
+void TestRepeatRule::roundTripsEveryRowOfTheTable_data()
+{
+    QTest::addColumn<QString>("rrule");
+    // Each row of the spec's repeat table, written the way toRRule writes it.
+    QTest::newRow("daily") << QStringLiteral("FREQ=DAILY");
+    QTest::newRow("every 3 days") << QStringLiteral("FREQ=DAILY;INTERVAL=3");
+    QTest::newRow("weekly on days") << QStringLiteral("FREQ=WEEKLY;BYDAY=MO,WE,FR");
+    QTest::newRow("monthly on day") << QStringLiteral("FREQ=MONTHLY;BYMONTHDAY=18");
+    QTest::newRow("monthly last friday") << QStringLiteral("FREQ=MONTHLY;BYDAY=-1FR");
+    QTest::newRow("monthly 2nd tuesday") << QStringLiteral("FREQ=MONTHLY;INTERVAL=2;BYDAY=2TU");
+    QTest::newRow("yearly") << QStringLiteral("FREQ=YEARLY");
+    QTest::newRow("yearly last fri of sep") << QStringLiteral("FREQ=YEARLY;BYMONTH=9;BYDAY=-1FR");
+    QTest::newRow("count") << QStringLiteral("FREQ=MONTHLY;BYMONTHDAY=18;COUNT=12");
+    QTest::newRow("until date") << QStringLiteral("FREQ=YEARLY;UNTIL=20301231");
+}
+
+void TestRepeatRule::roundTripsEveryRowOfTheTable()
+{
+    QFETCH(QString, rrule);
+    const QDate start(2026, 9, 18);
+    const RepeatRule rule = RepeatRule::fromRRule(rrule, start);
+    QVERIFY2(!rule.custom, qPrintable(rrule));
+    // UNTIL in the "until date" row is a DATE, so the all-day form (no suffix).
+    QCOMPARE(rule.toRRule(rule.end == RepeatRule::End::Until
+                              ? rule.until.toString(QStringLiteral("yyyyMMdd"))
+                              : QString()),
+             rrule);
+    QCOMPARE(RepeatRule::fromRRule(rule.toRRule(rule.until.toString(QStringLiteral("yyyyMMdd"))),
+                                   start), rule);
+}
+
+void TestRepeatRule::fillsWhatAnRruleLeavesImplicit()
+{
+    // 2026-09-18 is a Friday.
+    const RepeatRule weekly = RepeatRule::fromRRule(QStringLiteral("FREQ=WEEKLY"), QDate(2026, 9, 18));
+    QCOMPARE(weekly.weekdays, QList<int>{ Qt::Friday });
+    const RepeatRule monthly = RepeatRule::fromRRule(QStringLiteral("FREQ=MONTHLY"), QDate(2026, 9, 18));
+    QCOMPARE(monthly.by, RepeatRule::By::MonthDay);
+    QCOMPARE(monthly.monthDay, 18);
+}
+
+void TestRepeatRule::recognisesACustomRule_data()
+{
+    QTest::addColumn<QString>("rrule");
+    QTest::newRow("bysetpos") << QStringLiteral("FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=-1");
+    QTest::newRow("byweekno") << QStringLiteral("FREQ=YEARLY;BYWEEKNO=20");
+    QTest::newRow("hourly") << QStringLiteral("FREQ=HOURLY");
+    QTest::newRow("two months") << QStringLiteral("FREQ=YEARLY;BYMONTH=3,9;BYDAY=-1FR");
+    QTest::newRow("two monthdays") << QStringLiteral("FREQ=MONTHLY;BYMONTHDAY=1,15");
+    QTest::newRow("weekly ordinal") << QStringLiteral("FREQ=WEEKLY;BYDAY=1MO");
+    QTest::newRow("fifth monday") << QStringLiteral("FREQ=MONTHLY;BYDAY=5MO");
+}
+
+void TestRepeatRule::recognisesACustomRule()
+{
+    QFETCH(QString, rrule);
+    const RepeatRule rule = RepeatRule::fromRRule(rrule, QDate(2026, 9, 18));
+    QVERIFY(rule.custom);
+    // An edit never rewrites a custom rule: it comes back exactly.
+    QCOMPARE(rule.toRRule(), rrule);
+}
+
+void TestRepeatRule::keepsWkst()
+{
+    const RepeatRule rule = RepeatRule::fromRRule(QStringLiteral("FREQ=YEARLY;WKST=TU"), QDate(2026, 9, 18));
+    QVERIFY(!rule.custom);
+    QCOMPARE(rule.toRRule(), QStringLiteral("FREQ=YEARLY;WKST=TU"));
+}
+
+void TestRepeatRule::readsUntilInEveryForm()
+{
+    const QDate start(2026, 9, 18);
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=DAILY;UNTIL=20261231"), start).until,
+             QDate(2026, 12, 31));
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=DAILY;UNTIL=20261231T120000"), start).until,
+             QDate(2026, 12, 31));
+    // A UTC UNTIL keeps its UTC date: the caller writes 23:59:59 local as UTC,
+    // which in a zone east of UTC is still the same date.
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=DAILY;UNTIL=20261231T215959Z"), start).until,
+             QDate(2026, 12, 31));
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=DAILY;UNTIL=20261231"), start).end,
+             RepeatRule::End::Until);
+}
+
+void TestRepeatRule::describesInWords()
+{
+    QLocale::setDefault(QLocale::c());
+    const QDate start(2026, 9, 18);
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=DAILY"), start).describe(),
+             QStringLiteral("Daily"));
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=MONTHLY;BYDAY=-1FR"), start).describe(),
+             QStringLiteral("Monthly, on the last Friday"));
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=MONTHLY;BYMONTHDAY=18;COUNT=12"), start).describe(),
+             QStringLiteral("Monthly, on day 18, 12 times"));
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=YEARLY;BYMONTH=9;BYDAY=-1FR"), start).describe(),
+             QStringLiteral("Yearly, on the last Friday of September"));
+    QCOMPARE(RepeatRule::fromRRule(QStringLiteral("FREQ=YEARLY;BYWEEKNO=20"), start).describe(),
+             QStringLiteral("Custom rule"));
+}
+
 QTEST_MAIN(TestRepeatRule)
 #include "test_repeatrule.moc"