diff --git a/apps/dav/composer/composer/autoload_classmap.php b/apps/dav/composer/composer/autoload_classmap.php
index b42750c25e..bd63dee13b 100644
--- a/apps/dav/composer/composer/autoload_classmap.php
+++ b/apps/dav/composer/composer/autoload_classmap.php
@@ -210,6 +210,8 @@ return array(
     'OCA\\DAV\\Provisioning\\Apple\\AppleProvisioningNode' => $baseDir . '/../lib/Provisioning/Apple/AppleProvisioningNode.php',
     'OCA\\DAV\\Provisioning\\Apple\\AppleProvisioningPlugin' => $baseDir . '/../lib/Provisioning/Apple/AppleProvisioningPlugin.php',
     'OCA\\DAV\\RootCollection' => $baseDir . '/../lib/RootCollection.php',
+    'OCA\\DAV\\Search\\ContactsSearchProvider' => $baseDir . '/../lib/Search/ContactsSearchProvider.php',
+    'OCA\\DAV\\Search\\ContactsSearchResultEntry' => $baseDir . '/../lib/Search/ContactsSearchResultEntry.php',
     'OCA\\DAV\\Server' => $baseDir . '/../lib/Server.php',
     'OCA\\DAV\\Settings\\CalDAVSettings' => $baseDir . '/../lib/Settings/CalDAVSettings.php',
     'OCA\\DAV\\Storage\\PublicOwnerWrapper' => $baseDir . '/../lib/Storage/PublicOwnerWrapper.php',
diff --git a/apps/dav/composer/composer/autoload_static.php b/apps/dav/composer/composer/autoload_static.php
index 2d579289f0..a664c86f5f 100644
--- a/apps/dav/composer/composer/autoload_static.php
+++ b/apps/dav/composer/composer/autoload_static.php
@@ -225,6 +225,8 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Provisioning\\Apple\\AppleProvisioningNode' => __DIR__ . '/..' . '/../lib/Provisioning/Apple/AppleProvisioningNode.php',
         'OCA\\DAV\\Provisioning\\Apple\\AppleProvisioningPlugin' => __DIR__ . '/..' . '/../lib/Provisioning/Apple/AppleProvisioningPlugin.php',
         'OCA\\DAV\\RootCollection' => __DIR__ . '/..' . '/../lib/RootCollection.php',
+        'OCA\\DAV\\Search\\ContactsSearchProvider' => __DIR__ . '/..' . '/../lib/Search/ContactsSearchProvider.php',
+        'OCA\\DAV\\Search\\ContactsSearchResultEntry' => __DIR__ . '/..' . '/../lib/Search/ContactsSearchResultEntry.php',
         'OCA\\DAV\\Server' => __DIR__ . '/..' . '/../lib/Server.php',
         'OCA\\DAV\\Settings\\CalDAVSettings' => __DIR__ . '/..' . '/../lib/Settings/CalDAVSettings.php',
         'OCA\\DAV\\Storage\\PublicOwnerWrapper' => __DIR__ . '/..' . '/../lib/Storage/PublicOwnerWrapper.php',
diff --git a/apps/dav/lib/AppInfo/Application.php b/apps/dav/lib/AppInfo/Application.php
index bf1e614633..6f2f7b2915 100644
--- a/apps/dav/lib/AppInfo/Application.php
+++ b/apps/dav/lib/AppInfo/Application.php
@@ -54,6 +54,7 @@ use OCA\DAV\CardDAV\ContactsManager;
 use OCA\DAV\CardDAV\PhotoCache;
 use OCA\DAV\CardDAV\SyncService;
 use OCA\DAV\HookManager;
+use OCA\DAV\Search\ContactsSearchProvider;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
@@ -96,6 +97,11 @@ class Application extends App implements IBootstrap {
 		 * Register capabilities
 		 */
 		$context->registerCapability(Capabilities::class);
+
+		/*
+		 * Register Search Providers
+		 */
+		$context->registerSearchProvider(ContactsSearchProvider::class);
 	}
 
 	public function boot(IBootContext $context): void {
diff --git a/apps/dav/lib/CardDAV/CardDavBackend.php b/apps/dav/lib/CardDAV/CardDavBackend.php
index 9d602025c7..3b3474cdd0 100644
--- a/apps/dav/lib/CardDAV/CardDavBackend.php
+++ b/apps/dav/lib/CardDAV/CardDavBackend.php
@@ -951,7 +951,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 	}
 
 	/**
-	 * search contact
+	 * Search contacts in a specific address-book
 	 *
 	 * @param int $addressBookId
 	 * @param string $pattern which should match within the $searchProperties
@@ -962,11 +962,55 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 	 * 	- 'offset' - Set the offset for the limited search results
 	 * @return array an array of contacts which are arrays of key-value-pairs
 	 */
-	public function search($addressBookId, $pattern, $searchProperties, $options = []) {
+	public function search($addressBookId, $pattern, $searchProperties, $options = []): array {
+		return $this->searchByAddressBookIds([$addressBookId], $pattern, $searchProperties, $options);
+	}
+
+	/**
+	 * Search contacts in all address-books accessible by a user
+	 *
+	 * @param string $principalUri
+	 * @param string $pattern
+	 * @param array $searchProperties
+	 * @param array $options
+	 * @return array
+	 */
+	public function searchPrincipalUri(string $principalUri,
+									   string $pattern,
+									   array $searchProperties,
+									   array $options = []): array {
+		$addressBookIds = array_map(static function ($row):int {
+			return (int) $row['id'];
+		}, $this->getAddressBooksForUser($principalUri));
+
+		return $this->searchByAddressBookIds($addressBookIds, $pattern, $searchProperties, $options);
+	}
+
+	/**
+	 * @param array $addressBookIds
+	 * @param string $pattern
+	 * @param array $searchProperties
+	 * @param array $options
+	 * @return array
+	 */
+	private function searchByAddressBookIds(array $addressBookIds,
+											string $pattern,
+											array $searchProperties,
+											array $options = []): array {
 		$escapePattern = !\array_key_exists('escape_like_param', $options) || $options['escape_like_param'] !== false;
 
 		$query2 = $this->db->getQueryBuilder();
-		$or = $query2->expr()->orX();
+
+		$addressBookOr =  $query2->expr()->orX();
+		foreach ($addressBookIds as $addressBookId) {
+			$addressBookOr->add($query2->expr()->eq('cp.addressbookid', $query2->createNamedParameter($addressBookId)));
+		}
+
+		if ($addressBookOr->count() === 0) {
+			return [];
+		}
+
+		$propertyOr = $query2->expr()->orX();
 		foreach ($searchProperties as $property) {
 			if ($escapePattern) {
 				if ($property === 'EMAIL' && strpos($pattern, ' ') !== false) {
@@ -980,17 +1024,17 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 				}
 			}
 
-			$or->add($query2->expr()->eq('cp.name', $query2->createNamedParameter($property)));
+			$propertyOr->add($query2->expr()->eq('cp.name', $query2->createNamedParameter($property)));
 		}
 
-		if ($or->count() === 0) {
+		if ($propertyOr->count() === 0) {
 			return [];
 		}
 
 		$query2->selectDistinct('cp.cardid')
 			->from($this->dbCardsPropertiesTable, 'cp')
-			->andWhere($query2->expr()->eq('cp.addressbookid', $query2->createNamedParameter($addressBookId)))
-			->andWhere($or);
+			->andWhere($addressBookOr)
+			->andWhere($propertyOr);
 
 		// No need for like when the pattern is empty
 		if ('' !== $pattern) {
@@ -1016,7 +1060,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 		}, $matches);
 
 		$query = $this->db->getQueryBuilder();
-		$query->select('c.carddata', 'c.uri')
+		$query->select('c.addressbookid', 'c.carddata', 'c.uri')
 			->from($this->dbCardsTable, 'c')
 			->where($query->expr()->in('c.id', $query->createNamedParameter($matches, IQueryBuilder::PARAM_INT_ARRAY)));
 
@@ -1026,6 +1070,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 		$result->closeCursor();
 
 		return array_map(function ($array) {
+			$array['addressbookid'] = (int) $array['addressbookid'];
 			$modified = false;
 			$array['carddata'] = $this->readBlob($array['carddata'], $modified);
 			if ($modified) {
diff --git a/apps/dav/lib/Search/ContactsSearchProvider.php b/apps/dav/lib/Search/ContactsSearchProvider.php
new file mode 100644
index 0000000000..656b484c2b
--- /dev/null
+++ b/apps/dav/lib/Search/ContactsSearchProvider.php
@@ -0,0 +1,189 @@
+<?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\Search;
+
+use OCA\DAV\CardDAV\CardDavBackend;
+use OCP\App\IAppManager;
+use OCP\IL10N;
+use OCP\IURLGenerator;
+use OCP\IUser;
+use OCP\Search\IProvider;
+use OCP\Search\ISearchQuery;
+use OCP\Search\SearchResult;
+use Sabre\VObject\Component\VCard;
+use Sabre\VObject\Reader;
+
+class ContactsSearchProvider implements IProvider {
+
+	/** @var IAppManager */
+	private $appManager;
+
+	/** @var IL10N */
+	private $l10n;
+
+	/** @var IURLGenerator */
+	private $urlGenerator;
+
+	/** @var CardDavBackend */
+	private $backend;
+
+	/**
+	 * @var string[]
+	 */
+	private static $searchProperties = [
+		'N',
+		'FN',
+		'NICKNAME',
+		'EMAIL',
+		'ADR',
+	];
+
+	/**
+	 * ContactsSearchProvider constructor.
+	 *
+	 * @param IAppManager $appManager
+	 * @param IL10N $l10n
+	 * @param IURLGenerator $urlGenerator
+	 * @param CardDavBackend $backend
+	 */
+	public function __construct(IAppManager $appManager,
+								IL10N $l10n,
+								IURLGenerator $urlGenerator,
+								CardDavBackend $backend) {
+		$this->appManager = $appManager;
+		$this->l10n = $l10n;
+		$this->urlGenerator = $urlGenerator;
+		$this->backend = $backend;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getId(): string {
+		return 'contacts-dav';
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getName(): string {
+		return $this->l10n->t('Contacts');
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function search(IUser $user, ISearchQuery $query): SearchResult {
+		if (!$this->appManager->isEnabledForUser('contacts', $user)) {
+			return SearchResult::complete($this->getName(), []);
+		}
+
+		$principalUri = 'principals/users/' . $user->getUID();
+		$addressBooks = $this->backend->getAddressBooksForUser($principalUri);
+		$addressBooksById = [];
+		foreach ($addressBooks as $addressBook) {
+			$addressBooksById[(int) $addressBook['id']] = $addressBook;
+		}
+
+		$searchResults = $this->backend->searchPrincipalUri(
+			$principalUri,
+			$query->getTerm(),
+			self::$searchProperties,
+			[
+				'limit' => $query->getLimit(),
+				'offset' => $query->getCursor(),
+			]
+		);
+		$formattedResults = \array_map(function (array $contactRow) use ($addressBooksById):ContactsSearchResultEntry {
+			$addressBook = $addressBooksById[$contactRow['addressbookid']];
+
+			/** @var VCard $vCard */
+			$vCard = Reader::read($contactRow['carddata']);
+			$thumbnailUrl = '';
+			if ($vCard->PHOTO) {
+				$thumbnailUrl = $this->getDavUrlForContact($addressBook['principaluri'], $addressBook['uri'], $contactRow['uri']) . '?photo';
+			}
+
+			$title = (string)$vCard->FN;
+			$subline = $this->generateSubline($vCard);
+			$resourceUrl = $this->getDeepLinkToContactsApp($addressBook['uri'], (string) $vCard->UID);
+
+			return new ContactsSearchResultEntry($thumbnailUrl, $title, $subline, $resourceUrl, 'icon-contacts-dark', true);
+		}, $searchResults);
+
+		return SearchResult::paginated(
+			$this->getName(),
+			$formattedResults,
+			$query->getCursor() + count($formattedResults)
+		);
+	}
+
+	/**
+	 * @param string $principalUri
+	 * @param string $addressBookUri
+	 * @param string $contactsUri
+	 * @return string
+	 */
+	protected function getDavUrlForContact(string $principalUri,
+										   string $addressBookUri,
+										   string $contactsUri): string {
+		[, $principalType, $principalId] = explode('/', $principalUri, 3);
+
+		return $this->urlGenerator->getAbsoluteURL(
+			$this->urlGenerator->linkTo('', 'remote.php') . '/dav/addressbooks/'
+				. $principalType . '/'
+				. $principalId . '/'
+				. $addressBookUri . '/'
+				. $contactsUri
+		);
+	}
+
+	/**
+	 * @param string $addressBookUri
+	 * @param string $contactUid
+	 * @return string
+	 */
+	protected function getDeepLinkToContactsApp(string $addressBookUri,
+												string $contactUid): string {
+		return $this->urlGenerator->getAbsoluteURL(
+			$this->urlGenerator->linkToRoute('contacts.contacts.direct', [
+				'contact' => $contactUid . '~' . $addressBookUri
+			])
+		);
+	}
+
+	/**
+	 * @param VCard $vCard
+	 * @return string
+	 */
+	protected function generateSubline(VCard $vCard): string {
+		$emailAddresses = $vCard->select('EMAIL');
+		if (!is_array($emailAddresses) || empty($emailAddresses)) {
+			return '';
+		}
+
+		return (string)$emailAddresses[0];
+	}
+}
diff --git a/apps/dav/lib/Search/ContactsSearchResultEntry.php b/apps/dav/lib/Search/ContactsSearchResultEntry.php
new file mode 100644
index 0000000000..698fc1b3f4
--- /dev/null
+++ b/apps/dav/lib/Search/ContactsSearchResultEntry.php
@@ -0,0 +1,30 @@
+<?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\Search;
+
+use OCP\Search\ASearchResultEntry;
+
+class ContactsSearchResultEntry extends ASearchResultEntry {
+}
diff --git a/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php b/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php
new file mode 100644
index 0000000000..d89d8dd169
--- /dev/null
+++ b/apps/dav/tests/unit/Search/ContactsSearchProviderTest.php
@@ -0,0 +1,275 @@
+<?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;
+
+use OCA\DAV\CardDAV\CardDavBackend;
+use OCA\DAV\Search\ContactsSearchProvider;
+use OCA\DAV\Search\ContactsSearchResultEntry;
+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 ContactsSearchProviderTest 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 CardDavBackend|\PHPUnit\Framework\MockObject\MockObject */
+	private $backend;
+
+	/** @var ContactsSearchProvider */
+	private $provider;
+
+	private $vcardTest0 = 'BEGIN:VCARD'.PHP_EOL.
+		'VERSION:3.0'.PHP_EOL.
+		'PRODID:-//Sabre//Sabre VObject 4.1.2//EN'.PHP_EOL.
+		'UID:Test'.PHP_EOL.
+		'FN:FN of Test'.PHP_EOL.
+		'N:Test;;;;'.PHP_EOL.
+		'EMAIL:forrestgump@example.com'.PHP_EOL.
+		'END:VCARD';
+
+	private $vcardTest1 = 'BEGIN:VCARD'.PHP_EOL.
+		'VERSION:3.0'.PHP_EOL.
+		'PRODID:-//Sabre//Sabre VObject 4.1.2//EN'.PHP_EOL.
+		'PHOTO;ENCODING=b;TYPE=image/jpeg:'.PHP_EOL.
+		'UID:Test2'.PHP_EOL.
+		'FN:FN of Test2'.PHP_EOL.
+		'N:Test2;;;;'.PHP_EOL.
+		'END:VCARD';
+
+	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(CardDavBackend::class);
+
+		$this->provider = new ContactsSearchProvider(
+			$this->appManager,
+			$this->l10n,
+			$this->urlGenerator,
+			$this->backend
+		);
+	}
+
+	public function testGetId(): void {
+		$this->assertEquals('contacts-dav', $this->provider->getId());
+	}
+
+	public function testGetName(): void {
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->with('Contacts')
+			->willReturnArgument(0);
+
+		$this->assertEquals('Contacts', $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('contacts', $user)
+			->willReturn(false);
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->with('Contacts')
+			->willReturnArgument(0);
+		$this->backend->expects($this->never())
+			->method('getAddressBooksForUser');
+		$this->backend->expects($this->never())
+			->method('searchPrincipalUri');
+
+		$actual = $this->provider->search($user, $query);
+		$data = $actual->jsonSerialize();
+		$this->assertInstanceOf(SearchResult::class, $actual);
+		$this->assertEquals('Contacts', $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('contacts', $user)
+			->willReturn(true);
+		$this->l10n->expects($this->exactly(1))
+			->method('t')
+			->with('Contacts')
+			->willReturnArgument(0);
+
+		$this->backend->expects($this->once())
+			->method('getAddressBooksForUser')
+			->with('principals/users/john.doe')
+			->willReturn([
+				[
+					'id' => 99,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'addressbook-uri-99',
+				], [
+					'id' => 123,
+					'principaluri' => 'principals/users/john.doe',
+					'uri' => 'addressbook-uri-123',
+				]
+			]);
+		$this->backend->expects($this->once())
+			->method('searchPrincipalUri')
+			->with('principals/users/john.doe', 'search term',
+				['N', 'FN', 'NICKNAME', 'EMAIL', 'ADR'],
+				['limit' => 5, 'offset' => 20])
+			->willReturn([
+				[
+					'addressbookid' => 99,
+					'uri' => 'vcard0.vcf',
+					'carddata' => $this->vcardTest0,
+				],
+				[
+					'addressbookid' => 123,
+					'uri' => 'vcard1.vcf',
+					'carddata' => $this->vcardTest1,
+				],
+			]);
+
+		$provider = $this->getMockBuilder(ContactsSearchProvider::class)
+			->setConstructorArgs([
+				$this->appManager,
+				$this->l10n,
+				$this->urlGenerator,
+				$this->backend,
+			])
+			->setMethods([
+				'getDavUrlForContact',
+				'getDeepLinkToContactsApp',
+				'generateSubline',
+			])
+			->getMock();
+
+		$provider->expects($this->once())
+			->method('getDavUrlForContact')
+			->with('principals/users/john.doe', 'addressbook-uri-123', 'vcard1.vcf')
+			->willReturn('absolute-thumbnail-url');
+
+		$provider->expects($this->exactly(2))
+			->method('generateSubline')
+			->willReturn('subline');
+		$provider->expects($this->exactly(2))
+			->method('getDeepLinkToContactsApp')
+			->withConsecutive(
+				['addressbook-uri-99', 'Test'],
+				['addressbook-uri-123', 'Test2']
+			)
+			->willReturn('deep-link-to-contacts');
+
+		$actual = $provider->search($user, $query);
+		$data = $actual->jsonSerialize();
+		$this->assertInstanceOf(SearchResult::class, $actual);
+		$this->assertEquals('Contacts', $data['name']);
+		$this->assertCount(2, $data['entries']);
+		$this->assertTrue($data['isPaginated']);
+		$this->assertEquals(22, $data['cursor']);
+
+		$result0 = $data['entries'][0];
+		$result0Data = $result0->jsonSerialize();
+		$result1 = $data['entries'][1];
+		$result1Data = $result1->jsonSerialize();
+
+		$this->assertInstanceOf(ContactsSearchResultEntry::class, $result0);
+		$this->assertEquals('', $result0Data['thumbnailUrl']);
+		$this->assertEquals('FN of Test', $result0Data['title']);
+		$this->assertEquals('subline', $result0Data['subline']);
+		$this->assertEquals('deep-link-to-contacts', $result0Data['resourceUrl']);
+		$this->assertEquals('icon-contacts-dark', $result0Data['iconClass']);
+		$this->assertTrue($result0Data['rounded']);
+
+		$this->assertInstanceOf(ContactsSearchResultEntry::class, $result0);
+		$this->assertEquals('absolute-thumbnail-url?photo', $result1Data['thumbnailUrl']);
+		$this->assertEquals('FN of Test2', $result1Data['title']);
+		$this->assertEquals('subline', $result1Data['subline']);
+		$this->assertEquals('deep-link-to-contacts', $result1Data['resourceUrl']);
+		$this->assertEquals('icon-contacts-dark', $result1Data['iconClass']);
+		$this->assertTrue($result1Data['rounded']);
+	}
+
+	public function testGetDavUrlForContact(): void {
+		$this->urlGenerator->expects($this->once())
+			->method('linkTo')
+			->with('', 'remote.php')
+			->willReturn('link-to-remote.php');
+		$this->urlGenerator->expects($this->once())
+			->method('getAbsoluteURL')
+			->with('link-to-remote.php/dav/addressbooks/users/john.doe/foo/bar.vcf')
+			->willReturn('absolute-url-link-to-remote.php/dav/addressbooks/users/john.doe/foo/bar.vcf');
+
+		$actual = self::invokePrivate($this->provider, 'getDavUrlForContact', ['principals/users/john.doe', 'foo', 'bar.vcf']);
+
+		$this->assertEquals('absolute-url-link-to-remote.php/dav/addressbooks/users/john.doe/foo/bar.vcf', $actual);
+	}
+
+	public function testGetDeepLinkToContactsApp(): void {
+		$this->urlGenerator->expects($this->once())
+			->method('linkToRoute')
+			->with('contacts.contacts.direct', ['contact' => 'uid123~uri-john.doe'])
+			->willReturn('link-to-route-contacts.contacts.direct/direct/uid123~uri-john.doe');
+		$this->urlGenerator->expects($this->once())
+			->method('getAbsoluteURL')
+			->with('link-to-route-contacts.contacts.direct/direct/uid123~uri-john.doe')
+			->willReturn('absolute-url-link-to-route-contacts.contacts.direct/direct/uid123~uri-john.doe');
+
+		$actual = self::invokePrivate($this->provider, 'getDeepLinkToContactsApp', ['uri-john.doe', 'uid123']);
+		$this->assertEquals('absolute-url-link-to-route-contacts.contacts.direct/direct/uid123~uri-john.doe', $actual);
+	}
+
+	public function testGenerateSubline(): void {
+		$vCard0 = Reader::read($this->vcardTest0);
+		$vCard1 = Reader::read($this->vcardTest1);
+
+		$actual1 = self::invokePrivate($this->provider, 'generateSubline', [$vCard0]);
+		$actual2 = self::invokePrivate($this->provider, 'generateSubline', [$vCard1]);
+
+		$this->assertEquals('forrestgump@example.com', $actual1);
+		$this->assertEquals('', $actual2);
+	}
+}