Fix StringTest
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@ -125,12 +125,12 @@ class StringsTest extends TestCase
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/**
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* Tests if the string is a valid hexadecimal value
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*
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* @param string $input
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* @param bool $valid
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* @param string|null $input
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* @param bool $valid
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*
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* @dataProvider dataIsHex
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*/
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public function testIsHex(string $input, bool $valid)
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public function testIsHex(string $input = null, bool $valid = false)
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{
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self::assertEquals($valid, Strings::isHex($input));
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}
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