More tests

Author: rfc2822

lib/src/main/kotlin/at/bitfire/synctools/mapping/calendar/builder/DurationBuilder.kt

@@ -109,7 +109,7 @@ class DurationBuilder: AndroidEntityBuilder {
      * Calculates the DURATION from DTEND - DTSTART, if possible.
      *
      * @param dtStart   start date/date-time
-     * @param dtEnd     (optional) end date/date-time (ignored if it's not before [dtStart])
+     * @param dtEnd     (optional) end date/date-time (ignored if not after [dtStart])
      *
      * @return duration or `null` if no valid end time was available
      */

lib/src/test/kotlin/at/bitfire/synctools/mapping/calendar/builder/DurationBuilderTest.kt

@@ -71,6 +71,18 @@ class DurationBuilderTest {
         assertEquals("P3D", result.entityValues.get(Events.DURATION))
     }
 
+    @Test
+    fun `Recurring all-day event (with negative DURATION)`() {
+        val result = Entity(ContentValues())
+        val event = VEvent(propertyListOf(
+            DtStart(Date("20251010")),
+            Duration(Period.ofDays(-3)),    // invalid negative DURATION will be treated as positive
+            RRule("FREQ=DAILY;COUNT=5")
+        ))
+        builder.build(event, event, result)
+        assertEquals("P3D", result.entityValues.get(Events.DURATION))
+    }
+
     @Test
     fun `Recurring all-day event (with zero seconds DURATION)`() {
         val result = Entity(ContentValues())
@@ -95,6 +107,18 @@ class DurationBuilderTest {
         assertEquals("PT1H30M", result.entityValues.get(Events.DURATION))
     }
 
+    @Test
+    fun `Recurring non-all-day event (with negative DURATION)`() {
+        val result = Entity(ContentValues())
+        val event = VEvent(propertyListOf(
+            DtStart(DateTime("20251010T010203", tzVienna)),
+            Duration(java.time.Duration.ofMinutes(-90)),    // invalid negative DURATION will be treated as positive
+            RRule("FREQ=DAILY;COUNT=5")
+        ))
+        builder.build(event, event, result)
+        assertEquals("PT1H30M", result.entityValues.get(Events.DURATION))
+    }
+
     @Test
     fun `Recurring all-day event (with DTEND)`() {
         val result = Entity(ContentValues())