Test empty string in guessable data

CHANGELOG.md

@@ -13,7 +13,7 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 - Nothing
 
 ### Fixed
-- Nothing
+- Error emitted for empty string in guessable data.
 
 ### Deprecated
 - Nothing

src/Rule/GuessableDataRule.php

@@ -131,7 +131,7 @@ private function contains(string $password, $data): bool
         }
 
         foreach ($strings as $string) {
-            if ('' !== $string && mb_stripos($password, $string) !== false) {
+            if ($string !== '' && mb_stripos($password, $string) !== false) {
                 return true;
             }
         }

tests/Rule/GuessableDataRuleTest.php

@@ -85,6 +85,17 @@ public function testPasswordCanContainGuessableDateInRule(): void
         self::assertFalse($rule->test($password));
     }
 
+    /**
+     * @covers ::test
+     */
+    public function testPasswordDoesNotContainEmptyString(): void
+    {
+        $rule = new GuessableDataRule(['']);
+        $password = new Password('foobar');
+
+        self::assertTrue($rule->test($password));
+    }
+
     /**
      * @covers ::test
      */