Fix: Run 'tools/php-cs-fixer fix'

Author: localheinz

src/Framework/Constraint/StringStartsWith.php

@@ -9,7 +9,6 @@
  */
 namespace PHPUnit\Framework\Constraint;
 
-use function strlen;
 use function strpos;
 use PHPUnit\Framework\InvalidArgumentException;
 
@@ -26,7 +25,7 @@ final class StringStartsWith extends Constraint
 
     public function __construct(string $prefix)
     {
-        if (strlen($prefix) === 0) {
+        if ($prefix === '') {
             throw InvalidArgumentException::create(1, 'non-empty string');
         }