Correct. Just take it in and they will do a full hydrostatic test if it's not been used for a few years. It should have it's last test details on it for them to see anyway.
Not sure Holly is 100% correct about the dive shop testing , may be where he is they do that ??My local dive shop test dive bottles ( No integral gauge fitted ) every 2 1/2 years on a visual and 5 years for the full test. Surface use bottles ( With the integral gauge) are tested every 5 years and these SHOULD NOT be used for diving anyway.