[Intl][Tests] Use static data providers

Author: smnandre

Tests/ResourceBundleTestCase.php

@@ -758,46 +758,46 @@ protected function tearDown(): void
         \Locale::setDefault($this->defaultLocale);
     }
 
-    public function provideLocales()
+    public static function provideLocales()
     {
         return array_map(
             fn ($locale) => [$locale],
-            $this->getLocales()
+            self::getLocales()
         );
     }
 
-    public function provideLocaleAliases()
+    public static function provideLocaleAliases()
     {
         return array_map(
             fn ($alias, $ofLocale) => [$alias, $ofLocale],
-            array_keys($this->getLocaleAliases()),
-            $this->getLocaleAliases()
+            array_keys(self::getLocaleAliases()),
+            self::getLocaleAliases()
         );
     }
 
-    public function provideRootLocales()
+    public static function provideRootLocales()
     {
         return array_map(
             fn ($locale) => [$locale],
-            $this->getRootLocales()
+            self::getRootLocales()
         );
     }
 
-    protected function getLocales()
+    protected static function getLocales()
     {
         return self::LOCALES;
     }
 
-    protected function getLocaleAliases()
+    protected static function getLocaleAliases()
     {
         return self::LOCALE_ALIASES;
     }
 
-    protected function getRootLocales()
+    protected static function getRootLocales()
     {
         if (null === self::$rootLocales) {
-            self::$rootLocales = array_filter($this->getLocales(), fn ($locale) => // no locales for which fallback is possible (e.g "en_GB")
-!str_contains($locale, '_'));
+            // ignore locales for which fallback is possible (e.g "en_GB")
+            self::$rootLocales = array_filter(self::getLocales(), fn ($locale) => !str_contains($locale, '_'));
         }
 
         return self::$rootLocales;