/**
* Validates that a key is valid.
*
* @param int|string $key
*
* @return bool
*
* @throws InvalidKeyException If the key is invalid.
*/
protected function validateKey($key)
{
if (!is_string($key) && !is_int($key)) {
throw InvalidKeyException::forKey($key);
}
return true;
}
public function testForKey()
{
$this->given($cause = new \Exception('some cause'))->when($exception = InvalidKeyException::forKey('foo', $cause))->then()->object($exception)->isInstanceOf(InvalidKeyException::class)->integer($exception->getCode())->isEqualTo(0)->object($exception->getPrevious())->isIdenticalTo($cause);
$this->given($exception = InvalidKeyException::forKey('bar'))->then()->variable($exception->getPrevious())->isNull();
}