update

android/app/src/test/kotlin/de/marha/planer/DatesTest.kt

@@ -0,0 +1,40 @@
+package de.marha.planer
+
+import de.marha.planer.data.Dates
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class DatesTest {
+    @Test fun monthGridStartsMondayBefore() {
+        val grid = Dates.monthGrid(2026, 9)
+        assertEquals(42, grid.size)
+        assertEquals("2026-08-31", grid[0])
+        assertEquals("2026-06-01", Dates.monthGrid(2026, 6)[0])
+    }
+
+    @Test fun weekStartsMonday() {
+        assertEquals("2026-09-14", Dates.startOfWeek("2026-09-17"))
+        assertEquals("2026-09-14", Dates.startOfWeek("2026-09-20"))
+        assertEquals("2026-09-14", Dates.startOfWeek("2026-09-14"))
+        assertEquals(7, Dates.weekDays("2026-09-17").size)
+    }
+
+    @Test fun isoWeek() {
+        assertEquals(38, Dates.isoWeek("2026-09-17"))
+        assertEquals(53, Dates.isoWeek("2027-01-01"))
+    }
+
+    @Test fun formats() {
+        assertEquals("Do, 17.09.2026", Dates.formatDate("2026-09-17"))
+        assertEquals("17.09.", Dates.formatDayMonth("2026-09-17"))
+        assertEquals("September 2026", Dates.formatMonth(2026, 9))
+        assertEquals(90, Dates.timeToMinutes("01:30"))
+        assertEquals("01:30", Dates.minutesToTime(90))
+    }
+
+    // Gleiches Format wie die Extension, damit sich Zeitstempel als Strings vergleichen lassen
+    @Test fun nowIsoHasMillisAndZ() {
+        assertTrue(Regex("^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$").matches(Dates.nowIso()))
+    }
+}