[Bridge/PhpUnit] Enforce a consistent locale

src/Symfony/Bridge/PhpUnit/README.md

@@ -6,6 +6,7 @@ Provides utilities for PHPUnit, especially user deprecation notices management.
 It comes with the following features:
 
  * disable the garbage collector;
+ * enforce a consistent `C` locale;
  * auto-register `class_exists` to load Doctrine annotations;
  * print a user deprecation notices summary at the end of the test suite.
 

src/Symfony/Bridge/PhpUnit/bootstrap.php

@@ -14,6 +14,9 @@ if (PHP_VERSION_ID >= 50400 && gc_enabled()) {
     gc_disable();
 }
 
+// Enforce a consistent locale
+setlocale(LC_ALL, 'C');
+
 if (class_exists('Doctrine\Common\Annotations\AnnotationRegistry')) {
     AnnotationRegistry::registerLoader('class_exists');
 }