minor symfony#58101 [DependencyInjection] Fix test paths on Windows (alexandre-daubois)

This PR was merged into the 7.2 branch.

Discussion
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[DependencyInjection] Fix test paths on Windows

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Commits
-------

e415c1b [DependencyInjection] Fix test paths on Windows

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php

@@ -1318,7 +1318,7 @@ public function testInvalidBinaryKeyType()
         $loader = new XmlFileLoader($container, new FileLocator(self::$fixturesPath.'/xml'));
 
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage(\sprintf('Tag "<property>" with key-type="binary" does not have a valid base64 encoded key in "%s".', self::$fixturesPath.'/xml/key_type_incorrect_bin.xml'));
+        $this->expectExceptionMessage(\sprintf('Tag "<property>" with key-type="binary" does not have a valid base64 encoded key in "%s/xml%skey_type_incorrect_bin.xml".', self::$fixturesPath, \DIRECTORY_SEPARATOR));
         $loader->load('key_type_incorrect_bin.xml');
     }
 
@@ -1328,7 +1328,7 @@ public function testUnknownConstantAsKey()
         $loader = new XmlFileLoader($container, new FileLocator(self::$fixturesPath.'/xml'));
 
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage(\sprintf('The key "PHP_Unknown_CONST" is not a valid constant in "%s".', self::$fixturesPath.'/xml/key_type_wrong_constant.xml'));
+        $this->expectExceptionMessage(\sprintf('The key "PHP_Unknown_CONST" is not a valid constant in "%s/xml%skey_type_wrong_constant.xml".', self::$fixturesPath, \DIRECTORY_SEPARATOR));
         $loader->load('key_type_wrong_constant.xml');
     }