final protected function assertTraitExists(string $traitName): void
    {
        self::assertTrue(\trait_exists($traitName), \sprintf(
            'Failed asserting that a trait "%s" exists.',
            $traitName
        ));
    }
final protected function assertTraitExists(string $traitName): void
    {
        self::assertTrue(\trait_exists($traitName), \sprintf(
            'Failed asserting that a trait "%s" exists.',
            $traitName
        ));
    }
final protected function assertTraitExists ( string $ traitName ) : void { self :: assertTrue ( \ trait_exists ( $ traitName ) , \ sprintf ( 'Failed asserting that a trait "%s" exists.' , $ traitName ) ) ; }
Asserts that a trait exists.

@param string $traitName
Asserts that a trait exists .