diff --git a/test/Validator/PhoneNumberTest.php b/test/Validator/PhoneNumberTest.php
index ecbf9558..34bc0ca3 100644
--- a/test/Validator/PhoneNumberTest.php
+++ b/test/Validator/PhoneNumberTest.php
@@ -3083,6 +3083,12 @@ public function testAllowPossibleSetterGetter()
         $this->assertTrue($this->validator->allowPossible());
     }
 
+    public function testSetCountryMethodIsCaseInsensitive()
+    {
+        $this->validator->setCountry('us');
+        $this->assertSame('US', $this->validator->getCountry());
+    }
+
     public function testInvalidTypes()
     {
         $values = array(