Add Event and Task Backends for Unified Search

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

5 files changed, 1113 insertions, 13 deletions

diff --git a/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php b/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php
index 4c6c8549055..79da92148af 100644
--- a/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php
+++ b/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php
@@ -121,7 +121,12 @@ abstract class AbstractCalDavBackend extends TestCase {
 		$this->principal->expects($this->any())->method('getGroupMembership')
 			->withAnyParameters()
 			->willReturn([self::UNIT_TEST_GROUP, self::UNIT_TEST_GROUP2]);
-		$calendars = $this->backend->getCalendarsForUser(self::UNIT_TEST_USER);
+		$this->cleanupForPrincipal(self::UNIT_TEST_USER);
+		$this->cleanupForPrincipal(self::UNIT_TEST_USER1);
+	}
+
+	private function cleanupForPrincipal($principal): void {
+		$calendars = $this->backend->getCalendarsForUser($principal);
 		foreach ($calendars as $calendar) {
 			$this->dispatcher->expects($this->at(0))
 				->method('dispatch')
@@ -129,7 +134,7 @@ abstract class AbstractCalDavBackend extends TestCase {
 
 			$this->backend->deleteCalendar($calendar['id']);
 		}
-		$subscriptions = $this->backend->getSubscriptionsForUser(self::UNIT_TEST_USER);
+		$subscriptions = $this->backend->getSubscriptionsForUser($principal);
 		foreach ($subscriptions as $subscription) {
 			$this->backend->deleteSubscription($subscription['id']);
 		}
diff --git a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
index bd6a8856d51..4e343340f25 100644
--- a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
@@ -605,21 +605,21 @@ DTSTART;TZID=Europe/Warsaw:20170325T150000
 DTEND;TZID=Europe/Warsaw:20170325T160000
 TRANSP:OPAQUE
 DESCRIPTION:Magiczna treść uzyskana za pomocą magicznego proszku.\n\nę
- żźćńłóÓŻŹĆŁĘ€śśśŚŚ\n               \,\,))))))))\;\,\n  
+ żźćńłóÓŻŹĆŁĘ€śśśŚŚ\n               \,\,))))))))\;\,\n
            __))))))))))))))\,\n \\|/       -\\(((((''''((((((((.\n -*-==///
- ///((''  .     `))))))\,\n /|\\      ))| o    \;-.    '(((((              
-                     \,(\,\n          ( `|    /  )    \;))))'              
+ ///((''  .     `))))))\,\n /|\\      ))| o    \;-.    '(((((
+                     \,(\,\n          ( `|    /  )    \;))))'
                   \,_))^\;(~\n             |   |   |   \,))((((_     _____-
  -----~~~-.        %\,\;(\;(>'\;'~\n             o_)\;   \;    )))(((` ~---
  ~  `::           \\      %%~~)(v\;(`('~\n                   \;    ''''````
-          `:       `:::|\\\,__\,%%    )\;`'\; ~\n                  |   _   
-              )     /      `:|`----'     `-'\n            ______/\\/~    | 
+          `:       `:::|\\\,__\,%%    )\;`'\; ~\n                  |   _
+              )     /      `:|`----'     `-'\n            ______/\\/~    |
                  /        /\n          /~\;\;.____/\;\;'  /          ___--\
- ,-(   `\;\;\;/\n         / //  _\;______\;'------~~~~~    /\;\;/\\    /\n 
-        //  | |                        / \;   \\\;\;\,\\\n       (<_  | \; 
-                      /'\,/-----'  _>\n        \\_| ||_                    
-  //~\;~~~~~~~~~\n            `\\_|                   (\,~~  -Tua Xiong\n  
-                                   \\~\\\n                                 
+ ,-(   `\;\;\;/\n         / //  _\;______\;'------~~~~~    /\;\;/\\    /\n
+        //  | |                        / \;   \\\;\;\,\\\n       (<_  | \;
+                      /'\,/-----'  _>\n        \\_| ||_
+  //~\;~~~~~~~~~\n            `\\_|                   (\,~~  -Tua Xiong\n
+                                   \\~\\\n
      ~~\n\n
 SEQUENCE:1
 X-MOZ-GENERATION:1
@@ -999,4 +999,282 @@ EOD;
 		$this->assertEquals($calendarInfoUser['id'], $calendarInfoUser1['id']);
 		$this->assertEquals($calendarInfoUser['uri'], $calendarInfoUser1['uri']);
 	}
+
+	public function testSearchPrincipal(): void {
+		$myPublic = <<<EOD
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//dmfs.org//mimedir.icalendar//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20160419T130000
+SUMMARY:My Test (public)
+CLASS:PUBLIC
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+DTEND;TZID=Europe/Berlin:20160419T140000
+LAST-MODIFIED:20160419T074202Z
+DTSTAMP:20160419T074202Z
+CREATED:20160419T074202Z
+UID:2e468c48-7860-492e-bc52-92fa0daeeccf.1461051722310-1
+END:VEVENT
+END:VCALENDAR
+EOD;
+		$myPrivate = <<<EOD
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//dmfs.org//mimedir.icalendar//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20160419T130000
+SUMMARY:My Test (private)
+CLASS:PRIVATE
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+DTEND;TZID=Europe/Berlin:20160419T140000
+LAST-MODIFIED:20160419T074202Z
+DTSTAMP:20160419T074202Z
+CREATED:20160419T074202Z
+UID:2e468c48-7860-492e-bc52-92fa0daeeccf.1461051722310-2
+END:VEVENT
+END:VCALENDAR
+EOD;
+		$myConfidential = <<<EOD
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//dmfs.org//mimedir.icalendar//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20160419T130000
+SUMMARY:My Test (confidential)
+CLASS:CONFIDENTIAL
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+DTEND;TZID=Europe/Berlin:20160419T140000
+LAST-MODIFIED:20160419T074202Z
+DTSTAMP:20160419T074202Z
+CREATED:20160419T074202Z
+UID:2e468c48-7860-492e-bc52-92fa0daeeccf.1461051722310-3
+END:VEVENT
+END:VCALENDAR
+EOD;
+
+		$sharerPublic = <<<EOD
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//dmfs.org//mimedir.icalendar//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20160419T130000
+SUMMARY:Sharer Test (public)
+CLASS:PUBLIC
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+DTEND;TZID=Europe/Berlin:20160419T140000
+LAST-MODIFIED:20160419T074202Z
+DTSTAMP:20160419T074202Z
+CREATED:20160419T074202Z
+UID:2e468c48-7860-492e-bc52-92fa0daeeccf.1461051722310-4
+END:VEVENT
+END:VCALENDAR
+EOD;
+		$sharerPrivate = <<<EOD
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//dmfs.org//mimedir.icalendar//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20160419T130000
+SUMMARY:Sharer Test (private)
+CLASS:PRIVATE
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+DTEND;TZID=Europe/Berlin:20160419T140000
+LAST-MODIFIED:20160419T074202Z
+DTSTAMP:20160419T074202Z
+CREATED:20160419T074202Z
+UID:2e468c48-7860-492e-bc52-92fa0daeeccf.1461051722310-5
+END:VEVENT
+END:VCALENDAR
+EOD;
+		$sharerConfidential = <<<EOD
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//dmfs.org//mimedir.icalendar//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20160419T130000
+SUMMARY:Sharer Test (confidential)
+CLASS:CONFIDENTIAL
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+DTEND;TZID=Europe/Berlin:20160419T140000
+LAST-MODIFIED:20160419T074202Z
+DTSTAMP:20160419T074202Z
+CREATED:20160419T074202Z
+UID:2e468c48-7860-492e-bc52-92fa0daeeccf.1461051722310-6
+END:VEVENT
+END:VCALENDAR
+EOD;
+
+		$l10n = $this->createMock(IL10N::class);
+		$l10n
+			->expects($this->any())
+			->method('t')
+			->willReturnCallback(function ($text, $parameters = []) {
+				return vsprintf($text, $parameters);
+			});
+		$config = $this->createMock(IConfig::class);
+		$this->userManager->expects($this->any())
+			->method('userExists')
+			->willReturn(true);
+		$this->groupManager->expects($this->any())
+			->method('groupExists')
+			->willReturn(true);
+
+		$me = self::UNIT_TEST_USER;
+		$sharer = self::UNIT_TEST_USER1;
+		$this->backend->createCalendar($me, 'calendar-uri-me', []);
+		$this->backend->createCalendar($sharer, 'calendar-uri-sharer', []);
+
+		$myCalendars = $this->backend->getCalendarsForUser($me);
+		$this->assertCount(1, $myCalendars);
+
+		$sharerCalendars = $this->backend->getCalendarsForUser($sharer);
+		$this->assertCount(1, $sharerCalendars);
+		$sharerCalendar = new Calendar($this->backend, $sharerCalendars[0], $l10n, $config);
+		$this->backend->updateShares($sharerCalendar, [
+			[
+				'href' => 'principal:' . $me,
+				'readOnly' => false,
+			],
+		], []);
+
+		$this->assertCount(2, $this->backend->getCalendarsForUser($me));
+
+		$this->backend->createCalendarObject($myCalendars[0]['id'], 'event0.ics', $myPublic);
+		$this->backend->createCalendarObject($myCalendars[0]['id'], 'event1.ics', $myPrivate);
+		$this->backend->createCalendarObject($myCalendars[0]['id'], 'event2.ics', $myConfidential);
+
+		$this->backend->createCalendarObject($sharerCalendars[0]['id'], 'event3.ics', $sharerPublic);
+		$this->backend->createCalendarObject($sharerCalendars[0]['id'], 'event4.ics', $sharerPrivate);
+		$this->backend->createCalendarObject($sharerCalendars[0]['id'], 'event5.ics', $sharerConfidential);
+
+		$mySearchResults = $this->backend->searchPrincipalUri($me, 'Test', ['VEVENT'], ['SUMMARY'], []);
+		$sharerSearchResults = $this->backend->searchPrincipalUri($sharer, 'Test', ['VEVENT'], ['SUMMARY'], []);
+
+		$this->assertCount(4, $mySearchResults);
+		$this->assertCount(3, $sharerSearchResults);
+
+		$this->assertEquals($myPublic, $mySearchResults[0]['calendardata']);
+		$this->assertEquals($myPrivate, $mySearchResults[1]['calendardata']);
+		$this->assertEquals($myConfidential, $mySearchResults[2]['calendardata']);
+		$this->assertEquals($sharerPublic, $mySearchResults[3]['calendardata']);
+
+		$this->assertEquals($sharerPublic, $sharerSearchResults[0]['calendardata']);
+		$this->assertEquals($sharerPrivate, $sharerSearchResults[1]['calendardata']);
+		$this->assertEquals($sharerConfidential, $sharerSearchResults[2]['calendardata']);
+	}
 }
diff --git a/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php b/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php
index d89d8dd1690..e0cfe3245ba 100644
--- a/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php
+++ b/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php
@@ -224,7 +224,7 @@ class ContactsSearchProviderTest extends TestCase {
 		$this->assertEquals('icon-contacts-dark', $result0Data['iconClass']);
 		$this->assertTrue($result0Data['rounded']);
 
-		$this->assertInstanceOf(ContactsSearchResultEntry::class, $result0);
+		$this->assertInstanceOf(ContactsSearchResultEntry::class, $result1);
 		$this->assertEquals('absolute-thumbnail-url?photo', $result1Data['thumbnailUrl']);
 		$this->assertEquals('FN of Test2', $result1Data['title']);
 		$this->assertEquals('subline', $result1Data['subline']);
diff --git a/apps/dav/tests/unit/Search/EventsSearchProviderTest.php b/apps/dav/tests/unit/Search/EventsSearchProviderTest.php
new file mode 100644
index 00000000000..f0d6329db5c
--- /dev/null
+++ b/apps/dav/tests/unit/Search/EventsSearchProviderTest.php
@@ -0,0 +1,473 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2020, Georg Ehrke
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\Tests\unit\Search;
+
+use OCA\DAV\CalDAV\CalDavBackend;
+use OCA\DAV\Search\EventsSearchProvider;
+use OCA\DAV\Search\EventsSearchResultEntry;
+use OCP\App\IAppManager;
+use OCP\IL10N;
+use OCP\IURLGenerator;
+use OCP\IUser;
+use OCP\Search\ISearchQuery;
+use OCP\Search\SearchResult;
+use Sabre\VObject\Reader;
+use Test\TestCase;
+
+class EventsSearchProviderTest extends TestCase {
+
+	/** @var IAppManager|\PHPUnit\Framework\MockObject\MockObject */
+	private $appManager;
+
+	/** @var IL10N|\PHPUnit\Framework\MockObject\MockObject */
+	private $l10n;
+
+	/** @var IURLGenerator|\PHPUnit\Framework\MockObject\MockObject */
+	private $urlGenerator;
+
+	/** @var CalDavBackend|\PHPUnit\Framework\MockObject\MockObject */
+	private $backend;
+
+	/** @var EventsSearchProvider */
+	private $provider;
+
+	// NO SUMMARY
+	private $vEvent0 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Apple Inc.//Mac OS X 10.11.6//EN'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20161004T144433Z'.PHP_EOL.
+		'UID:85560E76-1B0D-47E1-A735-21625767FCA4'.PHP_EOL.
+		'DTEND;VALUE=DATE:20161008'.PHP_EOL.
+		'TRANSP:TRANSPARENT'.PHP_EOL.
+		'DTSTART;VALUE=DATE:20161005'.PHP_EOL.
+		'DTSTAMP:20161004T144437Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// TIMED SAME DAY
+	private $vEvent1 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Tests//'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VTIMEZONE'.PHP_EOL.
+		'TZID:Europe/Berlin'.PHP_EOL.
+		'BEGIN:DAYLIGHT'.PHP_EOL.
+		'TZOFFSETFROM:+0100'.PHP_EOL.
+		'RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU'.PHP_EOL.
+		'DTSTART:19810329T020000'.PHP_EOL.
+		'TZNAME:GMT+2'.PHP_EOL.
+		'TZOFFSETTO:+0200'.PHP_EOL.
+		'END:DAYLIGHT'.PHP_EOL.
+		'BEGIN:STANDARD'.PHP_EOL.
+		'TZOFFSETFROM:+0200'.PHP_EOL.
+		'RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU'.PHP_EOL.
+		'DTSTART:19961027T030000'.PHP_EOL.
+		'TZNAME:GMT+1'.PHP_EOL.
+		'TZOFFSETTO:+0100'.PHP_EOL.
+		'END:STANDARD'.PHP_EOL.
+		'END:VTIMEZONE'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20160809T163629Z'.PHP_EOL.
+		'UID:0AD16F58-01B3-463B-A215-FD09FC729A02'.PHP_EOL.
+		'DTEND;TZID=Europe/Berlin:20160816T100000'.PHP_EOL.
+		'TRANSP:OPAQUE'.PHP_EOL.
+		'SUMMARY:Test Europe Berlin'.PHP_EOL.
+		'DTSTART;TZID=Europe/Berlin:20160816T090000'.PHP_EOL.
+		'DTSTAMP:20160809T163632Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// TIMED DIFFERENT DAY
+	private $vEvent2 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Tests//'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VTIMEZONE'.PHP_EOL.
+		'TZID:Europe/Berlin'.PHP_EOL.
+		'BEGIN:DAYLIGHT'.PHP_EOL.
+		'TZOFFSETFROM:+0100'.PHP_EOL.
+		'RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU'.PHP_EOL.
+		'DTSTART:19810329T020000'.PHP_EOL.
+		'TZNAME:GMT+2'.PHP_EOL.
+		'TZOFFSETTO:+0200'.PHP_EOL.
+		'END:DAYLIGHT'.PHP_EOL.
+		'BEGIN:STANDARD'.PHP_EOL.
+		'TZOFFSETFROM:+0200'.PHP_EOL.
+		'RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU'.PHP_EOL.
+		'DTSTART:19961027T030000'.PHP_EOL.
+		'TZNAME:GMT+1'.PHP_EOL.
+		'TZOFFSETTO:+0100'.PHP_EOL.
+		'END:STANDARD'.PHP_EOL.
+		'END:VTIMEZONE'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20160809T163629Z'.PHP_EOL.
+		'UID:0AD16F58-01B3-463B-A215-FD09FC729A02'.PHP_EOL.
+		'DTEND;TZID=Europe/Berlin:20160817T100000'.PHP_EOL.
+		'TRANSP:OPAQUE'.PHP_EOL.
+		'SUMMARY:Test Europe Berlin'.PHP_EOL.
+		'DTSTART;TZID=Europe/Berlin:20160816T090000'.PHP_EOL.
+		'DTSTAMP:20160809T163632Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// ALL-DAY ONE-DAY
+	private $vEvent3 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Apple Inc.//Mac OS X 10.11.6//EN'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20161004T144433Z'.PHP_EOL.
+		'UID:85560E76-1B0D-47E1-A735-21625767FCA4'.PHP_EOL.
+		'DTEND;VALUE=DATE:20161006'.PHP_EOL.
+		'TRANSP:TRANSPARENT'.PHP_EOL.
+		'DTSTART;VALUE=DATE:20161005'.PHP_EOL.
+		'DTSTAMP:20161004T144437Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// ALL-DAY MULTIPLE DAYS
+	private $vEvent4 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Apple Inc.//Mac OS X 10.11.6//EN'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20161004T144433Z'.PHP_EOL.
+		'UID:85560E76-1B0D-47E1-A735-21625767FCA4'.PHP_EOL.
+		'DTEND;VALUE=DATE:20161008'.PHP_EOL.
+		'TRANSP:TRANSPARENT'.PHP_EOL.
+		'DTSTART;VALUE=DATE:20161005'.PHP_EOL.
+		'DTSTAMP:20161004T144437Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// DURATION
+	private $vEvent5 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Apple Inc.//Mac OS X 10.11.6//EN'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20161004T144433Z'.PHP_EOL.
+		'UID:85560E76-1B0D-47E1-A735-21625767FCA4'.PHP_EOL.
+		'DURATION:P5D'.PHP_EOL.
+		'TRANSP:TRANSPARENT'.PHP_EOL.
+		'DTSTART;VALUE=DATE:20161005'.PHP_EOL.
+		'DTSTAMP:20161004T144437Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// NO DTEND - DATE
+	private $vEvent6 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Apple Inc.//Mac OS X 10.11.6//EN'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20161004T144433Z'.PHP_EOL.
+		'UID:85560E76-1B0D-47E1-A735-21625767FCA4'.PHP_EOL.
+		'TRANSP:TRANSPARENT'.PHP_EOL.
+		'DTSTART;VALUE=DATE:20161005'.PHP_EOL.
+		'DTSTAMP:20161004T144437Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// NO DTEND - DATE-TIME
+	private $vEvent7 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'PRODID:-//Tests//'.PHP_EOL.
+		'CALSCALE:GREGORIAN'.PHP_EOL.
+		'BEGIN:VTIMEZONE'.PHP_EOL.
+		'TZID:Europe/Berlin'.PHP_EOL.
+		'BEGIN:DAYLIGHT'.PHP_EOL.
+		'TZOFFSETFROM:+0100'.PHP_EOL.
+		'RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU'.PHP_EOL.
+		'DTSTART:19810329T020000'.PHP_EOL.
+		'TZNAME:GMT+2'.PHP_EOL.
+		'TZOFFSETTO:+0200'.PHP_EOL.
+		'END:DAYLIGHT'.PHP_EOL.
+		'BEGIN:STANDARD'.PHP_EOL.
+		'TZOFFSETFROM:+0200'.PHP_EOL.
+		'RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU'.PHP_EOL.
+		'DTSTART:19961027T030000'.PHP_EOL.
+		'TZNAME:GMT+1'.PHP_EOL.
+		'TZOFFSETTO:+0100'.PHP_EOL.
+		'END:STANDARD'.PHP_EOL.
+		'END:VTIMEZONE'.PHP_EOL.
+		'BEGIN:VEVENT'.PHP_EOL.
+		'CREATED:20160809T163629Z'.PHP_EOL.
+		'UID:0AD16F58-01B3-463B-A215-FD09FC729A02'.PHP_EOL.
+		'TRANSP:OPAQUE'.PHP_EOL.
+		'SUMMARY:Test Europe Berlin'.PHP_EOL.
+		'DTSTART;TZID=Europe/Berlin:20160816T090000'.PHP_EOL.
+		'DTSTAMP:20160809T163632Z'.PHP_EOL.
+		'SEQUENCE:0'.PHP_EOL.
+		'END:VEVENT'.PHP_EOL.
+		'END:VCALENDAR';
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->appManager = $this->createMock(IAppManager::class);
+		$this->l10n = $this->createMock(IL10N::class);
+		$this->urlGenerator = $this->createMock(IURLGenerator::class);
+		$this->backend = $this->createMock(CalDavBackend::class);
+
+		$this->provider = new EventsSearchProvider(
+			$this->appManager,
+			$this->l10n,
+			$this->urlGenerator,
+			$this->backend
+		);
+	}
+
+	public function testGetId(): void {
+		$this->assertEquals('calendar-dav', $this->provider->getId());
+	}
+
+	public function testGetName(): void {
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->with('Events')
+			->willReturnArgument(0);
+
+		$this->assertEquals('Events', $this->provider->getName());
+	}
+
+	public function testSearchAppDisabled(): void {
+		$user = $this->createMock(IUser::class);
+		$query = $this->createMock(ISearchQuery::class);
+		$this->appManager->expects($this->once())
+			->method('isEnabledForUser')
+			->with('calendar', $user)
+			->willReturn(false);
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->willReturnArgument(0);
+		$this->backend->expects($this->never())
+			->method('getCalendarsForUser');
+		$this->backend->expects($this->never())
+			->method('getSubscriptionsForUser');
+		$this->backend->expects($this->never())
+			->method('searchPrincipalUri');
+
+		$actual = $this->provider->search($user, $query);
+		$data = $actual->jsonSerialize();
+		$this->assertInstanceOf(SearchResult::class, $actual);
+		$this->assertEquals('Events', $data['name']);
+		$this->assertEmpty($data['entries']);
+		$this->assertFalse($data['isPaginated']);
+		$this->assertNull($data['cursor']);
+	}
+
+	public function testSearch(): void {
+		$user = $this->createMock(IUser::class);
+		$user->method('getUID')->willReturn('john.doe');
+		$query = $this->createMock(ISearchQuery::class);
+		$query->method('getTerm')->willReturn('search term');
+		$query->method('getLimit')->willReturn(5);
+		$query->method('getCursor')->willReturn(20);
+		$this->appManager->expects($this->once())
+			->method('isEnabledForUser')
+			->with('calendar', $user)
+			->willReturn(true);
+		$this->l10n->method('t')->willReturnArgument(0);
+
+		$this->backend->expects($this->once())
+			->method('getCalendarsForUser')
+			->with('principals/users/john.doe')
+			->willReturn([
+				[
+					'id' => 99,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'calendar-uri-99',
+				], [
+					'id' => 123,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'calendar-uri-123',
+				]
+			]);
+		$this->backend->expects($this->once())
+			->method('getSubscriptionsForUser')
+			->with('principals/users/john.doe')
+			->willReturn([
+				[
+					'id' => 1337,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'subscription-uri-1337',
+				]
+			]);
+		$this->backend->expects($this->once())
+			->method('searchPrincipalUri')
+			->with('principals/users/john.doe', 'search term', ['VEVENT'],
+				['SUMMARY', 'LOCATION', 'DESCRIPTION', 'ATTENDEE', 'ORGANIZER', 'CATEGORIES'],
+				['ATTENDEE' => ['CN'], 'ORGANIZER' => ['CN']],
+				['limit' => 5, 'offset' => 20])
+			->willReturn([
+				[
+					'calendarid' => 99,
+					'calendartype' => CalDavBackend::CALENDAR_TYPE_CALENDAR,
+					'uri' => 'event0.ics',
+					'calendardata' => $this->vEvent0,
+				],
+				[
+					'calendarid' => 123,
+					'calendartype' => CalDavBackend::CALENDAR_TYPE_CALENDAR,
+					'uri' => 'event1.ics',
+					'calendardata' => $this->vEvent1,
+				],
+				[
+					'calendarid' => 1337,
+					'calendartype' => CalDavBackend::CALENDAR_TYPE_SUBSCRIPTION,
+					'uri' => 'event2.ics',
+					'calendardata' => $this->vEvent2,
+				]
+			]);
+
+		$provider = $this->getMockBuilder(EventsSearchProvider::class)
+			->setConstructorArgs([
+				$this->appManager,
+				$this->l10n,
+				$this->urlGenerator,
+				$this->backend,
+			])
+			->setMethods([
+				'getDeepLinkToCalendarApp',
+				'generateSubline',
+			])
+			->getMock();
+
+		$provider->expects($this->exactly(3))
+			->method('generateSubline')
+			->willReturn('subline');
+		$provider->expects($this->exactly(3))
+			->method('getDeepLinkToCalendarApp')
+			->withConsecutive(
+				['principals/users/john.doe', 'calendar-uri-99', 'event0.ics'],
+				['principals/users/john.doe', 'calendar-uri-123', 'event1.ics'],
+				['principals/users/john.doe', 'subscription-uri-1337', 'event2.ics']
+			)
+			->willReturn('deep-link-to-calendar');
+
+		$actual = $provider->search($user, $query);
+		$data = $actual->jsonSerialize();
+		$this->assertInstanceOf(SearchResult::class, $actual);
+		$this->assertEquals('Events', $data['name']);
+		$this->assertCount(3, $data['entries']);
+		$this->assertTrue($data['isPaginated']);
+		$this->assertEquals(23, $data['cursor']);
+
+		$result0 = $data['entries'][0];
+		$result0Data = $result0->jsonSerialize();
+		$result1 = $data['entries'][1];
+		$result1Data = $result1->jsonSerialize();
+		$result2 = $data['entries'][2];
+		$result2Data = $result2->jsonSerialize();
+
+		$this->assertInstanceOf(EventsSearchResultEntry::class, $result0);
+		$this->assertEmpty($result0Data['thumbnailUrl']);
+		$this->assertEquals('Untitled event', $result0Data['title']);
+		$this->assertEquals('subline', $result0Data['subline']);
+		$this->assertEquals('deep-link-to-calendar', $result0Data['resourceUrl']);
+		$this->assertEquals('icon-calendar-dark', $result0Data['iconClass']);
+		$this->assertFalse($result0Data['rounded']);
+
+		$this->assertInstanceOf(EventsSearchResultEntry::class, $result1);
+		$this->assertEmpty($result1Data['thumbnailUrl']);
+		$this->assertEquals('Test Europe Berlin', $result1Data['title']);
+		$this->assertEquals('subline', $result1Data['subline']);
+		$this->assertEquals('deep-link-to-calendar', $result1Data['resourceUrl']);
+		$this->assertEquals('icon-calendar-dark', $result1Data['iconClass']);
+		$this->assertFalse($result1Data['rounded']);
+
+		$this->assertInstanceOf(EventsSearchResultEntry::class, $result2);
+		$this->assertEmpty($result2Data['thumbnailUrl']);
+		$this->assertEquals('Test Europe Berlin', $result2Data['title']);
+		$this->assertEquals('subline', $result2Data['subline']);
+		$this->assertEquals('deep-link-to-calendar', $result2Data['resourceUrl']);
+		$this->assertEquals('icon-calendar-dark', $result2Data['iconClass']);
+		$this->assertFalse($result2Data['rounded']);
+	}
+
+	public function testGetDeepLinkToCalendarApp(): void {
+		$this->urlGenerator->expects($this->at(0))
+			->method('linkTo')
+			->with('', 'remote.php')
+			->willReturn('link-to-remote.php');
+		$this->urlGenerator->expects($this->at(1))
+			->method('linkToRoute')
+			->with('calendar.view.index')
+			->willReturn('link-to-route-calendar/');
+		$this->urlGenerator->expects($this->at(2))
+			->method('getAbsoluteURL')
+			->with('link-to-route-calendar/edit/bGluay10by1yZW1vdGUucGhwL2Rhdi9jYWxlbmRhcnMvam9obi5kb2UvZm9vL2Jhci5pY3M=')
+			->willReturn('absolute-url-to-route');
+
+		$actual = self::invokePrivate($this->provider, 'getDeepLinkToCalendarApp', ['principals/users/john.doe', 'foo', 'bar.ics']);
+
+		$this->assertEquals('absolute-url-to-route', $actual);
+	}
+
+	/**
+	 * @param string $ics
+	 * @param string $expectedSubline
+	 *
+	 * @dataProvider generateSublineDataProvider
+	 */
+	public function testGenerateSubline(string $ics, string $expectedSubline): void {
+		$vCalendar = Reader::read($ics, Reader::OPTION_FORGIVING);
+		$eventComponent = $vCalendar->VEVENT;
+
+		$this->l10n->method('l')
+			->willReturnCallback(static function (string $type, \DateTime $date, $_):string {
+				if ($type === 'time') {
+					return $date->format('H:i');
+				}
+
+				return $date->format('m-d');
+			});
+
+		$actual = self::invokePrivate($this->provider, 'generateSubline', [$eventComponent]);
+		$this->assertEquals($expectedSubline, $actual);
+	}
+
+	public function generateSublineDataProvider(): array {
+		return [
+			[$this->vEvent1, '08-16 09:00 - 10:00'],
+			[$this->vEvent2, '08-16 09:00 - 08-17 10:00'],
+			[$this->vEvent3, '10-05'],
+			[$this->vEvent4, '10-05 - 10-07'],
+			[$this->vEvent5, '10-05 - 10-09'],
+			[$this->vEvent6, '10-05'],
+			[$this->vEvent7, '08-16 09:00 - 09:00'],
+		];
+	}
+}
diff --git a/apps/dav/tests/unit/Search/TasksSearchProviderTest.php b/apps/dav/tests/unit/Search/TasksSearchProviderTest.php
new file mode 100644
index 00000000000..30f57270e95
--- /dev/null
+++ b/apps/dav/tests/unit/Search/TasksSearchProviderTest.php
@@ -0,0 +1,344 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2020, Georg Ehrke
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\Tests\unit\Search;
+
+use OCA\DAV\CalDAV\CalDavBackend;
+use OCA\DAV\Search\TasksSearchProvider;
+use OCA\DAV\Search\TasksSearchResultEntry;
+use OCP\App\IAppManager;
+use OCP\IL10N;
+use OCP\IURLGenerator;
+use OCP\IUser;
+use OCP\Search\ISearchQuery;
+use OCP\Search\SearchResult;
+use Sabre\VObject\Reader;
+use Test\TestCase;
+
+class TasksSearchProviderTest extends TestCase {
+
+	/** @var IAppManager|\PHPUnit\Framework\MockObject\MockObject */
+	private $appManager;
+
+	/** @var IL10N|\PHPUnit\Framework\MockObject\MockObject */
+	private $l10n;
+
+	/** @var IURLGenerator|\PHPUnit\Framework\MockObject\MockObject */
+	private $urlGenerator;
+
+	/** @var CalDavBackend|\PHPUnit\Framework\MockObject\MockObject */
+	private $backend;
+
+	/** @var TasksSearchProvider */
+	private $provider;
+
+	// NO DUE NOR COMPLETED NOR SUMMARY
+	private $vTodo0 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'PRODID:TEST'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'BEGIN:VTODO'.PHP_EOL.
+		'UID:20070313T123432Z-456553@example.com'.PHP_EOL.
+		'DTSTAMP:20070313T123432Z'.PHP_EOL.
+		'STATUS:NEEDS-ACTION'.PHP_EOL.
+		'END:VTODO'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// DUE AND COMPLETED
+	private $vTodo1 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'PRODID:TEST'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'BEGIN:VTODO'.PHP_EOL.
+		'UID:20070313T123432Z-456553@example.com'.PHP_EOL.
+		'DTSTAMP:20070313T123432Z'.PHP_EOL.
+		'COMPLETED:20070707T100000Z'.PHP_EOL.
+		'DUE;VALUE=DATE:20070501'.PHP_EOL.
+		'SUMMARY:Task title'.PHP_EOL.
+		'STATUS:NEEDS-ACTION'.PHP_EOL.
+		'END:VTODO'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// COMPLETED ONLY
+	private $vTodo2 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'PRODID:TEST'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'BEGIN:VTODO'.PHP_EOL.
+		'UID:20070313T123432Z-456553@example.com'.PHP_EOL.
+		'DTSTAMP:20070313T123432Z'.PHP_EOL.
+		'COMPLETED:20070707T100000Z'.PHP_EOL.
+		'SUMMARY:Task title'.PHP_EOL.
+		'STATUS:NEEDS-ACTION'.PHP_EOL.
+		'END:VTODO'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// DUE DATE
+	private $vTodo3 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'PRODID:TEST'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'BEGIN:VTODO'.PHP_EOL.
+		'UID:20070313T123432Z-456553@example.com'.PHP_EOL.
+		'DTSTAMP:20070313T123432Z'.PHP_EOL.
+		'DUE;VALUE=DATE:20070501'.PHP_EOL.
+		'SUMMARY:Task title'.PHP_EOL.
+		'STATUS:NEEDS-ACTION'.PHP_EOL.
+		'END:VTODO'.PHP_EOL.
+		'END:VCALENDAR';
+
+	// DUE DATETIME
+	private $vTodo4 = 'BEGIN:VCALENDAR'.PHP_EOL.
+		'PRODID:TEST'.PHP_EOL.
+		'VERSION:2.0'.PHP_EOL.
+		'BEGIN:VTODO'.PHP_EOL.
+		'UID:20070313T123432Z-456553@example.com'.PHP_EOL.
+		'DTSTAMP:20070313T123432Z'.PHP_EOL.
+		'DUE:20070709T130000Z'.PHP_EOL.
+		'SUMMARY:Task title'.PHP_EOL.
+		'STATUS:NEEDS-ACTION'.PHP_EOL.
+		'END:VTODO'.PHP_EOL.
+		'END:VCALENDAR';
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->appManager = $this->createMock(IAppManager::class);
+		$this->l10n = $this->createMock(IL10N::class);
+		$this->urlGenerator = $this->createMock(IURLGenerator::class);
+		$this->backend = $this->createMock(CalDavBackend::class);
+
+		$this->provider = new TasksSearchProvider(
+			$this->appManager,
+			$this->l10n,
+			$this->urlGenerator,
+			$this->backend
+		);
+	}
+
+	public function testGetId(): void {
+		$this->assertEquals('tasks-dav', $this->provider->getId());
+	}
+
+	public function testGetName(): void {
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->with('Tasks')
+			->willReturnArgument(0);
+
+		$this->assertEquals('Tasks', $this->provider->getName());
+	}
+
+	public function testSearchAppDisabled(): void {
+		$user = $this->createMock(IUser::class);
+		$query = $this->createMock(ISearchQuery::class);
+		$this->appManager->expects($this->once())
+			->method('isEnabledForUser')
+			->with('tasks', $user)
+			->willReturn(false);
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->willReturnArgument(0);
+		$this->backend->expects($this->never())
+			->method('getCalendarsForUser');
+		$this->backend->expects($this->never())
+			->method('getSubscriptionsForUser');
+		$this->backend->expects($this->never())
+			->method('searchPrincipalUri');
+
+		$actual = $this->provider->search($user, $query);
+		$data = $actual->jsonSerialize();
+		$this->assertInstanceOf(SearchResult::class, $actual);
+		$this->assertEquals('Tasks', $data['name']);
+		$this->assertEmpty($data['entries']);
+		$this->assertFalse($data['isPaginated']);
+		$this->assertNull($data['cursor']);
+	}
+
+	public function testSearch(): void {
+		$user = $this->createMock(IUser::class);
+		$user->method('getUID')->willReturn('john.doe');
+		$query = $this->createMock(ISearchQuery::class);
+		$query->method('getTerm')->willReturn('search term');
+		$query->method('getLimit')->willReturn(5);
+		$query->method('getCursor')->willReturn(20);
+		$this->appManager->expects($this->once())
+			->method('isEnabledForUser')
+			->with('tasks', $user)
+			->willReturn(true);
+		$this->l10n->method('t')->willReturnArgument(0);
+
+		$this->backend->expects($this->once())
+			->method('getCalendarsForUser')
+			->with('principals/users/john.doe')
+			->willReturn([
+				[
+					'id' => 99,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'calendar-uri-99',
+				], [
+					'id' => 123,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'calendar-uri-123',
+				]
+			]);
+		$this->backend->expects($this->once())
+			->method('getSubscriptionsForUser')
+			->with('principals/users/john.doe')
+			->willReturn([
+				[
+					'id' => 1337,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'subscription-uri-1337',
+				]
+			]);
+		$this->backend->expects($this->once())
+			->method('searchPrincipalUri')
+			->with('principals/users/john.doe', 'search term', ['VTODO'],
+				['SUMMARY', 'DESCRIPTION', 'CATEGORIES'],
+				[],
+				['limit' => 5, 'offset' => 20])
+			->willReturn([
+				[
+					'calendarid' => 99,
+					'calendartype' => CalDavBackend::CALENDAR_TYPE_CALENDAR,
+					'uri' => 'todo0.ics',
+					'calendardata' => $this->vTodo0,
+				],
+				[
+					'calendarid' => 123,
+					'calendartype' => CalDavBackend::CALENDAR_TYPE_CALENDAR,
+					'uri' => 'todo1.ics',
+					'calendardata' => $this->vTodo1,
+				],
+				[
+					'calendarid' => 1337,
+					'calendartype' => CalDavBackend::CALENDAR_TYPE_SUBSCRIPTION,
+					'uri' => 'todo2.ics',
+					'calendardata' => $this->vTodo2,
+				]
+			]);
+
+		$provider = $this->getMockBuilder(TasksSearchProvider::class)
+			->setConstructorArgs([
+				$this->appManager,
+				$this->l10n,
+				$this->urlGenerator,
+				$this->backend,
+			])
+			->setMethods([
+				'getDeepLinkToTasksApp',
+				'generateSubline',
+			])
+			->getMock();
+
+		$provider->expects($this->exactly(3))
+			->method('generateSubline')
+			->willReturn('subline');
+		$provider->expects($this->exactly(3))
+			->method('getDeepLinkToTasksApp')
+			->withConsecutive(
+				['calendar-uri-99', 'todo0.ics'],
+				['calendar-uri-123', 'todo1.ics'],
+				['subscription-uri-1337', 'todo2.ics']
+			)
+			->willReturn('deep-link-to-tasks');
+
+		$actual = $provider->search($user, $query);
+		$data = $actual->jsonSerialize();
+		$this->assertInstanceOf(SearchResult::class, $actual);
+		$this->assertEquals('Tasks', $data['name']);
+		$this->assertCount(3, $data['entries']);
+		$this->assertTrue($data['isPaginated']);
+		$this->assertEquals(23, $data['cursor']);
+
+		$result0 = $data['entries'][0];
+		$result0Data = $result0->jsonSerialize();
+		$result1 = $data['entries'][1];
+		$result1Data = $result1->jsonSerialize();
+		$result2 = $data['entries'][2];
+		$result2Data = $result2->jsonSerialize();
+
+		$this->assertInstanceOf(TasksSearchResultEntry::class, $result0);
+		$this->assertEmpty($result0Data['thumbnailUrl']);
+		$this->assertEquals('Untitled task', $result0Data['title']);
+		$this->assertEquals('subline', $result0Data['subline']);
+		$this->assertEquals('deep-link-to-tasks', $result0Data['resourceUrl']);
+		$this->assertEquals('icon-checkmark', $result0Data['iconClass']);
+		$this->assertFalse($result0Data['rounded']);
+
+		$this->assertInstanceOf(TasksSearchResultEntry::class, $result1);
+		$this->assertEmpty($result1Data['thumbnailUrl']);
+		$this->assertEquals('Task title', $result1Data['title']);
+		$this->assertEquals('subline', $result1Data['subline']);
+		$this->assertEquals('deep-link-to-tasks', $result1Data['resourceUrl']);
+		$this->assertEquals('icon-checkmark', $result1Data['iconClass']);
+		$this->assertFalse($result1Data['rounded']);
+
+		$this->assertInstanceOf(TasksSearchResultEntry::class, $result2);
+		$this->assertEmpty($result2Data['thumbnailUrl']);
+		$this->assertEquals('Task title', $result2Data['title']);
+		$this->assertEquals('subline', $result2Data['subline']);
+		$this->assertEquals('deep-link-to-tasks', $result2Data['resourceUrl']);
+		$this->assertEquals('icon-checkmark', $result2Data['iconClass']);
+		$this->assertFalse($result2Data['rounded']);
+	}
+
+	public function testGetDeepLinkToTasksApp(): void {
+		$this->urlGenerator->expects($this->once())
+			->method('linkToRoute')
+			->with('tasks.page.index')
+			->willReturn('link-to-route-tasks.index');
+		$this->urlGenerator->expects($this->once())
+			->method('getAbsoluteURL')
+			->with('link-to-route-tasks.index#/calendars/uri-john.doe/tasks/task-uri.ics')
+			->willReturn('absolute-url-link-to-route-tasks.index#/calendars/uri-john.doe/tasks/task-uri.ics');
+
+		$actual = self::invokePrivate($this->provider, 'getDeepLinkToTasksApp', ['uri-john.doe', 'task-uri.ics']);
+		$this->assertEquals('absolute-url-link-to-route-tasks.index#/calendars/uri-john.doe/tasks/task-uri.ics', $actual);
+	}
+
+	/**
+	 * @param string $ics
+	 * @param string $expectedSubline
+	 *
+	 * @dataProvider generateSublineDataProvider
+	 */
+	public function testGenerateSubline(string $ics, string $expectedSubline): void {
+		$vCalendar = Reader::read($ics, Reader::OPTION_FORGIVING);
+		$taskComponent = $vCalendar->VTODO;
+
+		$this->l10n->method('t')->willReturnArgument(0);
+		$this->l10n->method('l')->willReturnArgument('');
+
+		$actual = self::invokePrivate($this->provider, 'generateSubline', [$taskComponent]);
+		$this->assertEquals($expectedSubline, $actual);
+	}
+
+	public function generateSublineDataProvider(): array {
+		return [
+			[$this->vTodo0, ''],
+			[$this->vTodo1, 'Completed on %s'],
+			[$this->vTodo2, 'Completed on %s'],
+			[$this->vTodo3, 'Due on %s'],
+			[$this->vTodo4, 'Due on %s by %s'],
+		];
+	}
+}