Add test verifying that whitespace is not allowed in xs:language values

Author: tvdijen

tests/XML/Assert/LanguageTest.php

@@ -57,7 +57,8 @@ public static function provideInvalidLanguage(): array
     {
         return [
             'empty string' => [false, ''],
-            'too long' => [false, 'toolongLanguageuage'],
+            'whitespace' => [false, 'en- us'],
+            'too long' => [false, 'toolongLanguageCode'],
         ];
     }
 }

tests/XMLSchema/Type/LanguageValueTest.php

@@ -58,6 +58,7 @@ public static function provideInvalidLanguage(): array
     {
         return [
             'empty string' => [false, ''],
+            'whitespace' => [false, 'en- us'],
             'too long' => [false, 'toolongLanguage'],
         ];
     }