diff --git a/test/phpunit/LangTest.php b/test/phpunit/LangTest.php
index ad76667d560..99f74dbd4fa 100644
--- a/test/phpunit/LangTest.php
+++ b/test/phpunit/LangTest.php
@@ -184,6 +184,10 @@ class LangTest extends PHPUnit\Framework\TestCase
 			$tmplangs->setDefaultLang($langcode);
 			$tmplangs->load("main");
 
+			$result=$tmplangs->transnoentitiesnoconv("DIRECTION");
+			print __METHOD__." DIRECTION=".$result."\n";
+			$this->assertTrue(in_array($result, array('rtl', 'ltr')), 'Error for vale of DIRECTION in main.lang file '.$code);
+
 			$result=$tmplangs->transnoentitiesnoconv("SeparatorDecimal");
 			print __METHOD__." SeparatorDecimal=".$result."\n";
 			$this->assertContains($result, array('.',',','/',' ','','None'), 'Error for decimal separator for lang code '.$code);	// Note that ، that is coma for RTL languages is not supported