Psychological tests are standardized measures of a particular psychological variable such as personality, intelligence, or emotional functioning. Many tests are commercially published and have to be purchased from the publisher. These are often very expensive and access might be restricted to Registered Psychologists only. The Library does not hold commercially published tests, but has information about them - see the section on Useful Books in the Library Stock.
There are lots of unpublished tests available which researchers have developed for use in specific projects. These are free to use but you may require permission from the author to do so. Many of these can be found through a simple Google search, or they may be appended to a journal article and you can use PsycINFO to search for them.
In PsycINFO put the keyword for your topic in the first search box, then type 'appended' into the second box and select Tests and Measures in the drop-down menu to the right, e.g.: