Add disabled test for Thunderbird repeating task

app/src/commonTest/java/org/tasks/TestUtilities.kt

@@ -31,12 +31,16 @@ object TestUtilities {
     private fun fromResource(path: String): at.bitfire.ical4android.Task =
             fromString(readFile(path))
 
-    fun readFile(path: String): String {
+    private fun readFile(path: String): String {
-        val url = javaClass.classLoader!!.getResource(path)
+        val uri = javaClass.classLoader?.getResource(path)?.toURI()
-        val paths = Paths.get(url!!.toURI())
+                ?: throw IllegalArgumentException()
+        val paths = Paths.get(uri)
         return String(Files.readAllBytes(paths), Charsets.UTF_8)
     }
 
-    fun fromString(task: String): at.bitfire.ical4android.Task =
+    private fun fromString(task: String): at.bitfire.ical4android.Task =
-            task.let { tasksFromReader(StringReader(it))[0] }
+            tasksFromReader(StringReader(task))
+                    .takeIf { it.size == 1 }
+                    ?.first()
+                    ?: throw IllegalStateException()
 }

app/src/test/java/org/tasks/caldav/ThunderbirdTests.kt

@@ -4,6 +4,7 @@ import com.todoroo.astrid.data.Task
 import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Before
+import org.junit.Ignore
 import org.junit.Test
 import org.tasks.TestUtilities.setup
 import org.tasks.TestUtilities.vtodo
@@ -100,4 +101,10 @@ class ThunderbirdTests {
                 "FREQ=WEEKLY;UNTIL=20200731T160000Z;BYDAY=MO,TU,WE,TH,FR",
                 remote.rRule!!.value)
     }
+
+    @Test
+    @Ignore
+    fun dontCrashOnMultipleTasks() {
+        vtodo("thunderbird/completed_repeating_task.txt")
+    }
 }

app/src/test/resources/thunderbird/completed_repeating_task.txt

@@ -0,0 +1,46 @@
+BEGIN:VCALENDAR
+PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
+VERSION:2.0
+BEGIN:VTIMEZONE
+TZID:America/Chicago
+BEGIN:DAYLIGHT
+TZOFFSETFROM:-0600
+TZOFFSETTO:-0500
+TZNAME:CDT
+DTSTART:19700308T020000
+RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:-0500
+TZOFFSETTO:-0600
+TZNAME:CST
+DTSTART:19701101T020000
+RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VTODO
+CREATED:20201220T220126Z
+LAST-MODIFIED:20201220T220139Z
+DTSTAMP:20201220T220139Z
+UID:e0600bbe-b9d0-ba48-80b0-998409625d03
+SUMMARY:Recurring
+RRULE:FREQ=DAILY
+DTSTART;TZID=America/Chicago:20201220T170000
+DUE;TZID=America/Chicago:20201220T170000
+X-MOZ-GENERATION:1
+END:VTODO
+BEGIN:VTODO
+CREATED:20201220T220135Z
+LAST-MODIFIED:20201220T220139Z
+DTSTAMP:20201220T220139Z
+UID:e0600bbe-b9d0-ba48-80b0-998409625d03
+SUMMARY:Recurring
+STATUS:COMPLETED
+RECURRENCE-ID;TZID=America/Chicago:20201220T170000
+DTSTART;TZID=America/Chicago:20201220T170000
+DUE;TZID=America/Chicago:20201220T170000
+COMPLETED:20201220T220139Z
+PERCENT-COMPLETE:100
+SEQUENCE:1
+END:VTODO
+END:VCALENDAR