merged branch bschussek/fix-locale-2.3 (PR #8847)

This PR was merged into the 2.3 branch.

Discussion
----------

[2.3][Locale] Fixed: StubLocale::setDefault() throws no exception when "en" is passed

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Same as #8846 for 2.3+.

Commits
-------

e1f40f2 [Locale] Fixed: Locale::setDefault() throws no exception when "en" is passed

src/Symfony/Component/Intl/Locale/Locale.php

@@ -312,6 +312,8 @@ class Locale
      */
     public static function setDefault($locale)
     {
-        throw new MethodNotImplementedException(__METHOD__);
+        if ('en' !== $locale) {
+            throw new MethodNotImplementedException(__METHOD__);
+        }
     }
 }

src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php

@@ -150,6 +150,11 @@ class LocaleTest extends AbstractLocaleTest
         $this->call('setDefault', 'pt_BR');
     }
 
+    public function testSetDefaultAcceptsEn()
+    {
+        $this->call('setDefault', 'en');
+    }
+
     protected function call($methodName)
     {
         $args = array_slice(func_get_args(), 1);