47 files changed, 72 insertions, 72 deletions

diff --git a/tests/ApplicationUtilsTest.php b/tests/ApplicationUtilsTest.php
index 15388970..57359196 100644
--- a/tests/ApplicationUtilsTest.php
+++ b/tests/ApplicationUtilsTest.php
@@ -17,7 +17,7 @@ class ApplicationUtilsTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset test data for each test
      */
-    public function setUp()
+    protected function setUp(): void
     {
         FakeApplicationUtils::$VERSION_CODE = '';
         if (file_exists(self::$testUpdateFile)) {
@@ -28,7 +28,7 @@ class ApplicationUtilsTest extends \PHPUnit\Framework\TestCase
     /**
      * Remove test version file if it exists
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         if (is_file('sandbox/version.php')) {
             unlink('sandbox/version.php');
diff --git a/tests/FileUtilsTest.php b/tests/FileUtilsTest.php
index 57719175..eb9cb89a 100644
--- a/tests/FileUtilsTest.php
+++ b/tests/FileUtilsTest.php
@@ -19,7 +19,7 @@ class FileUtilsTest extends \PHPUnit\Framework\TestCase
     /**
      * Delete test file after every test.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$file);
     }
diff --git a/tests/HistoryTest.php b/tests/HistoryTest.php
index 7189c3a9..e9e61032 100644
--- a/tests/HistoryTest.php
+++ b/tests/HistoryTest.php
@@ -16,7 +16,7 @@ class HistoryTest extends \PHPUnit\Framework\TestCase
     /**
      * Delete history file.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         if (file_exists(self::$historyFilePath)) {
             unlink(self::$historyFilePath);
diff --git a/tests/LanguagesTest.php b/tests/LanguagesTest.php
index de83f291..914179c8 100644
--- a/tests/LanguagesTest.php
+++ b/tests/LanguagesTest.php
@@ -22,7 +22,7 @@ class LanguagesTest extends \PHPUnit\Framework\TestCase
     /**
      *
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager(self::$configFile);
     }
diff --git a/tests/ThumbnailerTest.php b/tests/ThumbnailerTest.php
index c01849f7..5b6d6a4d 100644
--- a/tests/ThumbnailerTest.php
+++ b/tests/ThumbnailerTest.php
@@ -30,7 +30,7 @@ class ThumbnailerTest extends TestCase
      */
     protected $conf;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('thumbnails.mode', Thumbnailer::MODE_ALL);
@@ -43,7 +43,7 @@ class ThumbnailerTest extends TestCase
         WTConfigManager::addFile('tests/utils/config/wt.json');
     }
 
-    public function tearDown()
+    protected function tearDown(): void
     {
         $this->rrmdirContent('sandbox/');
     }
diff --git a/tests/TimeZoneTest.php b/tests/TimeZoneTest.php
index 02bf060f..d3d9aeeb 100644
--- a/tests/TimeZoneTest.php
+++ b/tests/TimeZoneTest.php
@@ -15,7 +15,7 @@ class TimeZoneTest extends PHPUnit\Framework\TestCase
      */
     protected $installedTimezones;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->installedTimezones = [
             'Antarctica/Syowa',
diff --git a/tests/UtilsTest.php b/tests/UtilsTest.php
index 26d2a6b8..93b77539 100644
--- a/tests/UtilsTest.php
+++ b/tests/UtilsTest.php
@@ -26,7 +26,7 @@ class UtilsTest extends PHPUnit\Framework\TestCase
     /**
      * Assign reference data
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         self::$defaultTimeZone = date_default_timezone_get();
         // Timezone without DST for test consistency
@@ -36,7 +36,7 @@ class UtilsTest extends PHPUnit\Framework\TestCase
     /**
      * Reset the timezone
      */
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         date_default_timezone_set(self::$defaultTimeZone);
     }
@@ -44,7 +44,7 @@ class UtilsTest extends PHPUnit\Framework\TestCase
     /**
      * Resets test data before each test
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         if (file_exists(self::$testLogFile)) {
             unlink(self::$testLogFile);
diff --git a/tests/api/ApiMiddlewareTest.php b/tests/api/ApiMiddlewareTest.php
index df2fb33a..b157e4a7 100644
--- a/tests/api/ApiMiddlewareTest.php
+++ b/tests/api/ApiMiddlewareTest.php
@@ -43,7 +43,7 @@ class ApiMiddlewareTest extends \PHPUnit\Framework\TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('api.secret', 'NapoleonWasALizard');
@@ -61,7 +61,7 @@ class ApiMiddlewareTest extends \PHPUnit\Framework\TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
     }
diff --git a/tests/api/ApiUtilsTest.php b/tests/api/ApiUtilsTest.php
index 7efec9bb..e8075a5d 100644
--- a/tests/api/ApiUtilsTest.php
+++ b/tests/api/ApiUtilsTest.php
@@ -13,7 +13,7 @@ class ApiUtilsTest extends \PHPUnit\Framework\TestCase
     /**
      * Force the timezone for ISO datetimes.
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         date_default_timezone_set('UTC');
     }
diff --git a/tests/api/controllers/history/HistoryTest.php b/tests/api/controllers/history/HistoryTest.php
index f4d3b646..40f26b12 100644
--- a/tests/api/controllers/history/HistoryTest.php
+++ b/tests/api/controllers/history/HistoryTest.php
@@ -41,7 +41,7 @@ class HistoryTest extends \PHPUnit\Framework\TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->refHistory = new \ReferenceHistory();
@@ -57,7 +57,7 @@ class HistoryTest extends \PHPUnit\Framework\TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testHistory);
     }
diff --git a/tests/api/controllers/info/InfoTest.php b/tests/api/controllers/info/InfoTest.php
index b5c938e1..cc50d2e3 100644
--- a/tests/api/controllers/info/InfoTest.php
+++ b/tests/api/controllers/info/InfoTest.php
@@ -47,7 +47,7 @@ class InfoTest extends TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -67,7 +67,7 @@ class InfoTest extends TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
     }
diff --git a/tests/api/controllers/links/DeleteLinkTest.php b/tests/api/controllers/links/DeleteLinkTest.php
index 6c2b3698..10dfe8bc 100644
--- a/tests/api/controllers/links/DeleteLinkTest.php
+++ b/tests/api/controllers/links/DeleteLinkTest.php
@@ -56,7 +56,7 @@ class DeleteLinkTest extends \PHPUnit\Framework\TestCase
     /**
      * Before each test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -78,7 +78,7 @@ class DeleteLinkTest extends \PHPUnit\Framework\TestCase
     /**
      * After each test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
         @unlink(self::$testHistory);
diff --git a/tests/api/controllers/links/GetLinkIdTest.php b/tests/api/controllers/links/GetLinkIdTest.php
index 8bb81dc8..ee42e259 100644
--- a/tests/api/controllers/links/GetLinkIdTest.php
+++ b/tests/api/controllers/links/GetLinkIdTest.php
@@ -55,7 +55,7 @@ class GetLinkIdTest extends \PHPUnit\Framework\TestCase
     /**
      * Before each test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -74,7 +74,7 @@ class GetLinkIdTest extends \PHPUnit\Framework\TestCase
     /**
      * After each test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
     }
diff --git a/tests/api/controllers/links/GetLinksTest.php b/tests/api/controllers/links/GetLinksTest.php
index d02e6fad..01c40c2f 100644
--- a/tests/api/controllers/links/GetLinksTest.php
+++ b/tests/api/controllers/links/GetLinksTest.php
@@ -55,7 +55,7 @@ class GetLinksTest extends \PHPUnit\Framework\TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -74,7 +74,7 @@ class GetLinksTest extends \PHPUnit\Framework\TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
     }
diff --git a/tests/api/controllers/links/PostLinkTest.php b/tests/api/controllers/links/PostLinkTest.php
index 4e791a04..b1c9008b 100644
--- a/tests/api/controllers/links/PostLinkTest.php
+++ b/tests/api/controllers/links/PostLinkTest.php
@@ -70,7 +70,7 @@ class PostLinkTest extends TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -107,7 +107,7 @@ class PostLinkTest extends TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
         @unlink(self::$testHistory);
diff --git a/tests/api/controllers/links/PutLinkTest.php b/tests/api/controllers/links/PutLinkTest.php
index 302cac0f..f582a2b5 100644
--- a/tests/api/controllers/links/PutLinkTest.php
+++ b/tests/api/controllers/links/PutLinkTest.php
@@ -62,7 +62,7 @@ class PutLinkTest extends \PHPUnit\Framework\TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -91,7 +91,7 @@ class PutLinkTest extends \PHPUnit\Framework\TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
         @unlink(self::$testHistory);
diff --git a/tests/api/controllers/tags/DeleteTagTest.php b/tests/api/controllers/tags/DeleteTagTest.php
index c6748872..b0980572 100644
--- a/tests/api/controllers/tags/DeleteTagTest.php
+++ b/tests/api/controllers/tags/DeleteTagTest.php
@@ -57,7 +57,7 @@ class DeleteTagTest extends \PHPUnit\Framework\TestCase
     /**
      * Before each test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -79,7 +79,7 @@ class DeleteTagTest extends \PHPUnit\Framework\TestCase
     /**
      * After each test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
         @unlink(self::$testHistory);
diff --git a/tests/api/controllers/tags/GetTagNameTest.php b/tests/api/controllers/tags/GetTagNameTest.php
index b9a81f9b..f8ee10d9 100644
--- a/tests/api/controllers/tags/GetTagNameTest.php
+++ b/tests/api/controllers/tags/GetTagNameTest.php
@@ -53,7 +53,7 @@ class GetTagNameTest extends \PHPUnit\Framework\TestCase
     /**
      * Before each test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -72,7 +72,7 @@ class GetTagNameTest extends \PHPUnit\Framework\TestCase
     /**
      * After each test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
     }
diff --git a/tests/api/controllers/tags/GetTagsTest.php b/tests/api/controllers/tags/GetTagsTest.php
index 53a3326d..ab666f20 100644
--- a/tests/api/controllers/tags/GetTagsTest.php
+++ b/tests/api/controllers/tags/GetTagsTest.php
@@ -57,7 +57,7 @@ class GetTagsTest extends \PHPUnit\Framework\TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -78,7 +78,7 @@ class GetTagsTest extends \PHPUnit\Framework\TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
     }
diff --git a/tests/api/controllers/tags/PutTagTest.php b/tests/api/controllers/tags/PutTagTest.php
index 2a3cc15a..e0bc8663 100644
--- a/tests/api/controllers/tags/PutTagTest.php
+++ b/tests/api/controllers/tags/PutTagTest.php
@@ -62,7 +62,7 @@ class PutTagTest extends \PHPUnit\Framework\TestCase
     /**
      * Before every test, instantiate a new Api with its config, plugins and bookmarks.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
         $this->conf->set('resource.datastore', self::$testDatastore);
@@ -84,7 +84,7 @@ class PutTagTest extends \PHPUnit\Framework\TestCase
     /**
      * After every test, remove the test datastore.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$testDatastore);
         @unlink(self::$testHistory);
diff --git a/tests/bookmark/BookmarkFileServiceTest.php b/tests/bookmark/BookmarkFileServiceTest.php
index a4ec1013..aed4dc76 100644
--- a/tests/bookmark/BookmarkFileServiceTest.php
+++ b/tests/bookmark/BookmarkFileServiceTest.php
@@ -66,7 +66,7 @@ class BookmarkFileServiceTest extends TestCase
      *
      * Resets test data for each test
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         if (file_exists(self::$testDatastore)) {
             unlink(self::$testDatastore);
diff --git a/tests/config/ConfigJsonTest.php b/tests/config/ConfigJsonTest.php
index 33160eb0..f1612e9b 100644
--- a/tests/config/ConfigJsonTest.php
+++ b/tests/config/ConfigJsonTest.php
@@ -11,7 +11,7 @@ class ConfigJsonTest extends \PHPUnit\Framework\TestCase
      */
     protected $configIO;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->configIO = new ConfigJson();
     }
diff --git a/tests/config/ConfigManagerTest.php b/tests/config/ConfigManagerTest.php
index 33830bc9..69456bce 100644
--- a/tests/config/ConfigManagerTest.php
+++ b/tests/config/ConfigManagerTest.php
@@ -14,7 +14,7 @@ class ConfigManagerTest extends \PHPUnit\Framework\TestCase
      */
     protected $conf;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager('tests/utils/config/configJson');
     }
diff --git a/tests/config/ConfigPhpTest.php b/tests/config/ConfigPhpTest.php
index fb91b51b..a9aa80f5 100644
--- a/tests/config/ConfigPhpTest.php
+++ b/tests/config/ConfigPhpTest.php
@@ -15,7 +15,7 @@ class ConfigPhpTest extends \PHPUnit\Framework\TestCase
      */
     protected $configIO;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->configIO = new ConfigPhp();
     }
diff --git a/tests/feed/CachedPageTest.php b/tests/feed/CachedPageTest.php
index 2e716432..25d640d3 100644
--- a/tests/feed/CachedPageTest.php
+++ b/tests/feed/CachedPageTest.php
@@ -17,7 +17,7 @@ class CachedPageTest extends \PHPUnit\Framework\TestCase
     /**
      * Create the cache directory if needed
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         if (!is_dir(self::$testCacheDir)) {
             mkdir(self::$testCacheDir);
@@ -28,7 +28,7 @@ class CachedPageTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset the page cache
      */
-    public function setUp()
+    protected function setUp(): void
     {
         if (file_exists(self::$filename)) {
             unlink(self::$filename);
diff --git a/tests/formatter/BookmarkDefaultFormatterTest.php b/tests/formatter/BookmarkDefaultFormatterTest.php
index cf48b00b..9ea86c14 100644
--- a/tests/formatter/BookmarkDefaultFormatterTest.php
+++ b/tests/formatter/BookmarkDefaultFormatterTest.php
@@ -25,7 +25,7 @@ class BookmarkDefaultFormatterTest extends TestCase
     /**
      * Initialize formatter instance.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         copy('tests/utils/config/configJson.json.php', self::$testConf .'.json.php');
         $this->conf = new ConfigManager(self::$testConf);
diff --git a/tests/formatter/BookmarkMarkdownFormatterTest.php b/tests/formatter/BookmarkMarkdownFormatterTest.php
index 3e72d1ee..a7729416 100644
--- a/tests/formatter/BookmarkMarkdownFormatterTest.php
+++ b/tests/formatter/BookmarkMarkdownFormatterTest.php
@@ -25,7 +25,7 @@ class BookmarkMarkdownFormatterTest extends TestCase
     /**
      * Initialize formatter instance.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         copy('tests/utils/config/configJson.json.php', self::$testConf .'.json.php');
         $this->conf = new ConfigManager(self::$testConf);
diff --git a/tests/formatter/BookmarkRawFormatterTest.php b/tests/formatter/BookmarkRawFormatterTest.php
index 4491b035..76cf1172 100644
--- a/tests/formatter/BookmarkRawFormatterTest.php
+++ b/tests/formatter/BookmarkRawFormatterTest.php
@@ -25,7 +25,7 @@ class BookmarkRawFormatterTest extends TestCase
     /**
      * Initialize formatter instance.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         copy('tests/utils/config/configJson.json.php', self::$testConf .'.json.php');
         $this->conf = new ConfigManager(self::$testConf);
diff --git a/tests/formatter/FormatterFactoryTest.php b/tests/formatter/FormatterFactoryTest.php
index 5adf3ffd..6aab6a61 100644
--- a/tests/formatter/FormatterFactoryTest.php
+++ b/tests/formatter/FormatterFactoryTest.php
@@ -24,7 +24,7 @@ class FormatterFactoryTest extends TestCase
     /**
      * Initialize FormatterFactory instance
      */
-    public function setUp()
+    protected function setUp(): void
     {
         copy('tests/utils/config/configJson.json.php', self::$testConf .'.json.php');
         $this->conf = new ConfigManager(self::$testConf);
diff --git a/tests/languages/fr/LanguagesFrTest.php b/tests/languages/fr/LanguagesFrTest.php
index b8b7ca3a..e412b5bc 100644
--- a/tests/languages/fr/LanguagesFrTest.php
+++ b/tests/languages/fr/LanguagesFrTest.php
@@ -27,7 +27,7 @@ class LanguagesFrTest extends \PHPUnit\Framework\TestCase
     /**
      * Init: force French
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new ConfigManager(self::$configFile);
         $this->conf->set('translation.language', 'fr');
@@ -36,7 +36,7 @@ class LanguagesFrTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset the locale since gettext seems to mess with it, making it too long
      */
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         if (! empty(getenv('UT_LOCALE'))) {
             setlocale(LC_ALL, getenv('UT_LOCALE'));
diff --git a/tests/legacy/LegacyLinkDBTest.php b/tests/legacy/LegacyLinkDBTest.php
index 0884ad03..92cf607c 100644
--- a/tests/legacy/LegacyLinkDBTest.php
+++ b/tests/legacy/LegacyLinkDBTest.php
@@ -52,7 +52,7 @@ class LegacyLinkDBTest extends \PHPUnit\Framework\TestCase
      *
      * Resets test data for each test
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         if (file_exists(self::$testDatastore)) {
             unlink(self::$testDatastore);
diff --git a/tests/legacy/LegacyLinkFilterTest.php b/tests/legacy/LegacyLinkFilterTest.php
index ba9ec529..8223cc15 100644
--- a/tests/legacy/LegacyLinkFilterTest.php
+++ b/tests/legacy/LegacyLinkFilterTest.php
@@ -34,7 +34,7 @@ class LegacyLinkFilterTest extends \PHPUnit\Framework\TestCase
     /**
      * Instantiate linkFilter with ReferenceLinkDB data.
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         self::$refDB = new ReferenceLinkDB(true);
         self::$refDB->write(self::$testDatastore);
diff --git a/tests/legacy/LegacyUpdaterTest.php b/tests/legacy/LegacyUpdaterTest.php
index 7c429811..9b693dcb 100644
--- a/tests/legacy/LegacyUpdaterTest.php
+++ b/tests/legacy/LegacyUpdaterTest.php
@@ -40,7 +40,7 @@ class LegacyUpdaterTest extends \PHPUnit\Framework\TestCase
     /**
      * Executed before each test.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         copy('tests/utils/config/configJson.json.php', self::$configFile .'.json.php');
         $this->conf = new ConfigManager(self::$configFile);
@@ -754,7 +754,7 @@ $GLOBALS[\'privateLinkByDefault\'] = true;';
         if (isset($_SESSION['warnings'])) {
             unset($_SESSION['warnings']);
         }
-        
+
         $updater = new LegacyUpdater([], [], $this->conf, true, $_SESSION);
         $this->assertTrue($updater->updateMethodWebThumbnailer());
         $this->assertFalse($this->conf->exists('thumbnail'));
diff --git a/tests/netscape/BookmarkExportTest.php b/tests/netscape/BookmarkExportTest.php
index 509da51d..13b85f3d 100644
--- a/tests/netscape/BookmarkExportTest.php
+++ b/tests/netscape/BookmarkExportTest.php
@@ -54,7 +54,7 @@ class BookmarkExportTest extends TestCase
     /**
      * Instantiate reference data
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         static::$conf = new ConfigManager('tests/utils/config/configJson');
         static::$conf->set('resource.datastore', static::$testDatastore);
diff --git a/tests/netscape/BookmarkImportTest.php b/tests/netscape/BookmarkImportTest.php
index f678e26b..89ae4aa7 100644
--- a/tests/netscape/BookmarkImportTest.php
+++ b/tests/netscape/BookmarkImportTest.php
@@ -75,7 +75,7 @@ class BookmarkImportTest extends TestCase
      */
     protected static $defaultTimeZone;
 
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         self::$defaultTimeZone = date_default_timezone_get();
         // Timezone without DST for test consistency
@@ -85,7 +85,7 @@ class BookmarkImportTest extends TestCase
     /**
      * Resets test data before each test
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         if (file_exists(self::$testDatastore)) {
             unlink(self::$testDatastore);
@@ -104,12 +104,12 @@ class BookmarkImportTest extends TestCase
     /**
      * Delete history file.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         @unlink(self::$historyFilePath);
     }
 
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         date_default_timezone_set(self::$defaultTimeZone);
     }
diff --git a/tests/plugins/PluginAddlinkTest.php b/tests/plugins/PluginAddlinkTest.php
index aa5c6988..1f60d289 100644
--- a/tests/plugins/PluginAddlinkTest.php
+++ b/tests/plugins/PluginAddlinkTest.php
@@ -14,7 +14,7 @@ class PluginAddlinkTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset plugin path.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         PluginManager::$PLUGINS_PATH = 'plugins';
     }
diff --git a/tests/plugins/PluginDefaultColorsTest.php b/tests/plugins/PluginDefaultColorsTest.php
index 9835dfa3..240bb4b2 100644
--- a/tests/plugins/PluginDefaultColorsTest.php
+++ b/tests/plugins/PluginDefaultColorsTest.php
@@ -19,7 +19,7 @@ class PluginDefaultColorsTest extends TestCase
     /**
      * Reset plugin path
      */
-    public function setUp()
+    protected function setUp(): void
     {
         PluginManager::$PLUGINS_PATH = 'sandbox';
         mkdir(PluginManager::$PLUGINS_PATH . '/default_colors/');
@@ -32,7 +32,7 @@ class PluginDefaultColorsTest extends TestCase
     /**
      * Remove sandbox files and folder
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         if (file_exists('sandbox/default_colors/default_colors.css.template')) {
             unlink('sandbox/default_colors/default_colors.css.template');
diff --git a/tests/plugins/PluginPlayvideosTest.php b/tests/plugins/PluginPlayvideosTest.php
index b7b6ce53..de1a1aec 100644
--- a/tests/plugins/PluginPlayvideosTest.php
+++ b/tests/plugins/PluginPlayvideosTest.php
@@ -19,7 +19,7 @@ class PluginPlayvideosTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset plugin path
      */
-    public function setUp()
+    protected function setUp(): void
     {
         PluginManager::$PLUGINS_PATH = 'plugins';
     }
diff --git a/tests/plugins/PluginPubsubhubbubTest.php b/tests/plugins/PluginPubsubhubbubTest.php
index e66f484e..d30c3703 100644
--- a/tests/plugins/PluginPubsubhubbubTest.php
+++ b/tests/plugins/PluginPubsubhubbubTest.php
@@ -21,7 +21,7 @@ class PluginPubsubhubbubTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset plugin path
      */
-    public function setUp()
+    protected function setUp(): void
     {
         PluginManager::$PLUGINS_PATH = 'plugins';
     }
diff --git a/tests/plugins/PluginQrcodeTest.php b/tests/plugins/PluginQrcodeTest.php
index c9f8c733..bc6be0eb 100644
--- a/tests/plugins/PluginQrcodeTest.php
+++ b/tests/plugins/PluginQrcodeTest.php
@@ -19,7 +19,7 @@ class PluginQrcodeTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset plugin path
      */
-    public function setUp()
+    protected function setUp(): void
     {
         PluginManager::$PLUGINS_PATH = 'plugins';
     }
diff --git a/tests/plugins/PluginWallabagTest.php b/tests/plugins/PluginWallabagTest.php
index 79751921..372929ea 100644
--- a/tests/plugins/PluginWallabagTest.php
+++ b/tests/plugins/PluginWallabagTest.php
@@ -15,7 +15,7 @@ class PluginWallabagTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset plugin path
      */
-    public function setUp()
+    protected function setUp(): void
     {
         PluginManager::$PLUGINS_PATH = 'plugins';
     }
diff --git a/tests/plugins/WallabagInstanceTest.php b/tests/plugins/WallabagInstanceTest.php
index a3cd9076..4cb0d4cc 100644
--- a/tests/plugins/WallabagInstanceTest.php
+++ b/tests/plugins/WallabagInstanceTest.php
@@ -14,7 +14,7 @@ class WallabagInstanceTest extends \PHPUnit\Framework\TestCase
     /**
      * Reset plugin path
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->instance = 'http://some.url';
     }
diff --git a/tests/render/PageCacheManagerTest.php b/tests/render/PageCacheManagerTest.php
index c258f45f..4aa7e179 100644
--- a/tests/render/PageCacheManagerTest.php
+++ b/tests/render/PageCacheManagerTest.php
@@ -29,7 +29,7 @@ class PageCacheManagerTest extends TestCase
     /**
      * Populate the cache with dummy files
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->cacheManager = new PageCacheManager(static::$testCacheDir, true);
 
@@ -48,7 +48,7 @@ class PageCacheManagerTest extends TestCase
     /**
      * Remove dummycache folder after each tests.
      */
-    public function tearDown()
+    protected function tearDown(): void
     {
         array_map('unlink', glob(self::$testCacheDir . '/*'));
         rmdir(self::$testCacheDir);
diff --git a/tests/security/BanManagerTest.php b/tests/security/BanManagerTest.php
index bba7c8ad..2fef82f5 100644
--- a/tests/security/BanManagerTest.php
+++ b/tests/security/BanManagerTest.php
@@ -32,7 +32,7 @@ class BanManagerTest extends TestCase
     /**
      * Prepare or reset test resources
      */
-    public function setUp()
+    protected function setUp(): void
     {
         if (file_exists($this->banFile)) {
             unlink($this->banFile);
diff --git a/tests/security/LoginManagerTest.php b/tests/security/LoginManagerTest.php
index f242be09..cc9aa647 100644
--- a/tests/security/LoginManagerTest.php
+++ b/tests/security/LoginManagerTest.php
@@ -63,7 +63,7 @@ class LoginManagerTest extends TestCase
     /**
      * Prepare or reset test resources
      */
-    public function setUp()
+    protected function setUp(): void
     {
         if (file_exists($this->banFile)) {
             unlink($this->banFile);
diff --git a/tests/security/SessionManagerTest.php b/tests/security/SessionManagerTest.php
index 11a59f9c..27e3b1a9 100644
--- a/tests/security/SessionManagerTest.php
+++ b/tests/security/SessionManagerTest.php
@@ -24,7 +24,7 @@ class SessionManagerTest extends TestCase
     /**
      * Assign reference data
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         self::$sidHashes = \ReferenceSessionIdHashes::getHashes();
     }
@@ -32,7 +32,7 @@ class SessionManagerTest extends TestCase
     /**
      * Initialize or reset test resources
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->conf = new \FakeConfigManager([
             'credentials.login' => 'johndoe',
diff --git a/tests/updater/UpdaterTest.php b/tests/updater/UpdaterTest.php
index a7dd70bf..277f2fb0 100644
--- a/tests/updater/UpdaterTest.php
+++ b/tests/updater/UpdaterTest.php
@@ -42,7 +42,7 @@ class UpdaterTest extends TestCase
     /**
      * Executed before each test.
      */
-    public function setUp()
+    protected function setUp(): void
     {
         $this->refDB = new \ReferenceLinkDB();
         $this->refDB->write(self::$testDatastore);