Fix StringTest

diff --git a/tests/src/Util/StringsTest.php b/tests/src/Util/StringsTest.php
index 9b2215368687800520f685d4709df2a2e65c26c0..7160cb28cc28c6ebc89f8e318219f3d5ce65735e 100644 (file)
--- a/tests/src/Util/StringsTest.php
+++ b/tests/src/Util/StringsTest.php
@@ -125,12 +125,12 @@ class StringsTest extends TestCase
        /**
         * Tests if the string is a valid hexadecimal value
         *
-        * @param string $input
-        * @param bool   $valid
+        * @param string|null $input
+        * @param bool        $valid
         *
         * @dataProvider dataIsHex
         */
-       public function testIsHex(string $input, bool $valid)
+       public function testIsHex(string $input = null, bool $valid = false)
        {
                self::assertEquals($valid, Strings::isHex($input));
        }