Do you know what you want to measure, but do not know what tests are available?
Start at your literature. Did the literature have a test that would work in your research? See what tests they may have used
Search for more articles in the search box on the library homepage and see what test(s) they cite.
Search databases in your subject area by entering relevant keywords on your topic.
Search test databases - PsycTESTS, Mental Measurements Yearbook