diff --git a/core/modules/system/lib/Drupal/system/Tests/Installer/InstallerTranslationTest.php b/core/modules/system/lib/Drupal/system/Tests/Installer/InstallerTranslationTest.php
index 756d872..b7d8ce5 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Installer/InstallerTranslationTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Installer/InstallerTranslationTest.php
@@ -44,6 +44,10 @@ protected function setUpLanguage() {
     $string = (string) current($elements);
     $this->assertNotEqual($string, 'Save and continue');
     $this->translations['Save and continue'] = $string;
+
+    // Check the language direction.
+    $direction = (string) current($this->xpath('/html/@dir'));
+    $this->assertEqual($direction, 'ltr', 'Early installer is correctly LTR aligned when selecting an LTR language.');
   }
 
   /**