Self-tests can be informative and can even nudge people to seek further help if appropriate, but they can’t replace the value of meeting with a professional. If you have concerns after doing some reading or taking a self-test, please do seek out a qualified person to talk further. You can always take the results of an online test to review in person.
A more comprehensive test that may help you find out what type or intensity of depression is present. Hosted by a Canadian organization in British Columbia so please note that contact phone numbers for further help will not be correct for those here in the U.S.