Fix story splitting in multishare flow.

app/src/test/java/org/thoughtcrime/securesms/sharing/DistributionListMultiShareTimestampProviderTest.kt

@@ -0,0 +1,18 @@
+package org.thoughtcrime.securesms.sharing
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.seconds
+
+class DistributionListMultiShareTimestampProviderTest {
+
+  @Test
+  fun `When I ask for index 4, then I expect to fill 4 new items`() {
+    val generator = mutableListOf(1L, 2, 3, 4, 5).map { it.seconds }.toMutableList()
+    val testSubject = DistributionListMultiShareTimestampProvider(getCurrentTimeMillis = { generator.removeAt(0) }, sleepTimeout = 0.seconds)
+
+    val actual = testSubject.getMillis(4).milliseconds
+    assertEquals(5.seconds, actual)
+  }
+}