Bring back forgotten tests

Remove "ocs-provider" test folder reference as it doesn't exist any
more.
Added back "Test" test subdir and fixed the tests inside.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

tests/Test/Repair/Owncloud/CleanPreviewsBackgroundJobTest.php

@@ -52,7 +52,7 @@ class CleanPreviewsBackgroundJobTest extends TestCase {
 	/** @var  IUserManager|\PHPUnit_Framework_MockObject_MockObject */
 	private $userManager;
 
-	public function setUp() {
+	public function setUp(): void {
 		parent::setUp();
 
 		$this->rootFolder = $this->createMock(IRootFolder::class);

tests/Test/Repair/Owncloud/CleanPreviewsTest.php

@@ -46,7 +46,7 @@ class CleanPreviewsTest extends TestCase {
 	/** @var CleanPreviews */
 	private $repair;
 
-	public function setUp() {
+	public function setUp(): void {
 		parent::setUp();
 
 		$this->jobList = $this->createMock(IJobList::class);

tests/Test/Repair/Owncloud/InstallCoreBundleTest.php

@@ -41,7 +41,7 @@ class InstallCoreBundleTest extends TestCase {
 	/** @var InstallCoreBundle */
 	private $installCoreBundle;
 
-	public function setUp() {
+	public function setUp(): void {
 		parent::setUp();
 		$this->bundleFetcher = $this->createMock(BundleFetcher::class);
 		$this->config = $this->createMock(IConfig::class);

tests/Test/Repair/Owncloud/UpdateLanguageCodesTest.php

@@ -43,7 +43,7 @@ class UpdateLanguageCodesTest extends TestCase {
 	/** @var IConfig | \PHPUnit_Framework_MockObject_MockObject */
 	private $config;
 
-	protected function setUp() {
+	protected function setUp(): void {
 		parent::setUp();
 
 		$this->connection = \OC::$server->getDatabaseConnection();

tests/phpunit-autotest.xml

@@ -9,7 +9,7 @@
 	<testsuite name='ownCloud'>
 		<directory suffix='.php'>lib/</directory>
 		<directory suffix='.php'>Core/</directory>
-		<directory suffix='.php'>ocs-provider/</directory>
+		<directory suffix='.php'>Test/</directory>
 		<file>apps.php</file>
 	</testsuite>
 	<!-- filters for code coverage -->