1 files changed, 86 insertions, 0 deletions
diff --git a/android/app/src/test/java/org/terst/doot/widget/ui/DootWidgetMultiDayTest.kt b/android/app/src/test/java/org/terst/doot/widget/ui/DootWidgetMultiDayTest.kt
new file mode 100644
index 0000000..2b6451f
--- /dev/null
+++ b/android/app/src/test/java/org/terst/doot/widget/ui/DootWidgetMultiDayTest.kt
@@ -0,0 +1,86 @@
+package org.terst.doot.widget.ui
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.terst.doot.widget.data.WidgetItem
+import java.time.LocalDate
+import java.time.ZoneId
+
+class DootWidgetMultiDayTest {
+    private val zone: ZoneId = ZoneId.of("UTC")
+
+    private fun event(start: String, end: String, isAllDay: Boolean = false): WidgetItem = WidgetItem(
+        id = "e1", title = "Event", source = "calendar", type = "event",
+        start = start, end = end, isAllDay = isAllDay
+    )
+
+    @Test
+    fun `isMultiDayEvent is false for a same-day timed event`() {
+        assertFalse(isMultiDayEvent(event("2026-07-13T10:00:00Z", "2026-07-13T11:00:00Z"), zone))
+    }
+
+    @Test
+    fun `isMultiDayEvent is true when start and end fall on different calendar days`() {
+        assertTrue(isMultiDayEvent(event("2026-07-13T17:35:00Z", "2026-07-30T22:30:00Z"), zone))
+    }
+
+    @Test
+    fun `isMultiDayEvent is true for a genuine all-day multi-day event`() {
+        assertTrue(isMultiDayEvent(event("2026-07-13T00:00:00Z", "2026-07-15T00:00:00Z", isAllDay = true), zone))
+    }
+
+    @Test
+    fun `isMultiDayEvent is false for non-event types`() {
+        val task = WidgetItem(
+            id = "t1", title = "Task", source = "doot", type = "task",
+            start = "2026-07-13T10:00:00Z", end = "2026-07-30T22:30:00Z"
+        )
+        assertFalse(isMultiDayEvent(task, zone))
+    }
+
+    @Test
+    fun `multiDayVariant returns STARTS on the event's start day`() {
+        val item = event("2026-07-13T17:35:00Z", "2026-07-30T22:30:00Z")
+        assertEquals(MultiDayVariant.STARTS, multiDayVariant(item, LocalDate.of(2026, 7, 13), zone))
+    }
+
+    @Test
+    fun `multiDayVariant returns ENDS on the event's end day`() {
+        val item = event("2026-07-13T17:35:00Z", "2026-07-30T22:30:00Z")
+        assertEquals(MultiDayVariant.ENDS, multiDayVariant(item, LocalDate.of(2026, 7, 30), zone))
+    }
+
+    @Test
+    fun `multiDayVariant returns SPANS on a day strictly between start and end`() {
+        val item = event("2026-07-13T17:35:00Z", "2026-07-30T22:30:00Z")
+        assertEquals(MultiDayVariant.SPANS, multiDayVariant(item, LocalDate.of(2026, 7, 20), zone))
+    }
+
+    @Test
+    fun `multiDayVariant returns NONE for a day outside the event's span`() {
+        val item = event("2026-07-13T17:35:00Z", "2026-07-30T22:30:00Z")
+        assertEquals(MultiDayVariant.NONE, multiDayVariant(item, LocalDate.of(2026, 8, 1), zone))
+    }
+
+    @Test
+    fun `isMultiDayEvent is false for a single-day all-day event (exclusive end-date)`() {
+        // Google Calendar's all-day End is EXCLUSIVE: a single-day all-day event on
+        // July 13 has start=Jul13 00:00, end=Jul14 00:00 (one day past its own day).
+        assertFalse(isMultiDayEvent(event("2026-07-13T00:00:00Z", "2026-07-14T00:00:00Z", isAllDay = true), zone))
+    }
+
+    @Test
+    fun `isMultiDayEvent is true for a 3-day all-day event`() {
+        // 3-day all-day event (Jul 13-15 inclusive) has end=Jul16 00:00 (exclusive).
+        assertTrue(isMultiDayEvent(event("2026-07-13T00:00:00Z", "2026-07-16T00:00:00Z", isAllDay = true), zone))
+    }
+
+    @Test
+    fun `multiDayVariant reports ENDS on the real last day of a multi-day all-day event, not the exclusive end date`() {
+        val item = event("2026-07-13T00:00:00Z", "2026-07-16T00:00:00Z", isAllDay = true)
+        assertEquals(MultiDayVariant.ENDS, multiDayVariant(item, LocalDate.of(2026, 7, 15), zone))
+        assertEquals(MultiDayVariant.NONE, multiDayVariant(item, LocalDate.of(2026, 7, 16), zone))
+    }
+}