Mental Measurements Yearbook with Tests In Print provides users with a comprehensive guide to over 3,000 contemporary, commercially-available testing instruments of all known commercially available tests that are currently in print in English. Does not contain full-text of actual tests but links may be provided.

PsycINFO provides some tests and measures used in scholarly articles. Enter relevant keywords/subjects/test names into the search box and then select the "Test and Measures" field in advanced search to find articles where the complete test was appended. You can also find tests by typing in "appended" in the Tests & Measures Field.

ERIC, the Educational Resource Information Center, provides access to education literature and resources. To find tests, enter relevant keywords/descriptors and select "Tests/Questionnaires" from the "Publication Type" drop down box on the bottom right of the advanced search screen.

CINAHL Plus covers nursing, biomedicine, health sciences, alternative/complementary medicine, consumer health and 17 allied health disciplines. This database offers access to over 250 tests and measurements, some of which include the full-text of the test.
Use "Questionnaire/Scale" and "Research Instrument" in the "Publication Type" drop down box to limit your results. You will find results more focused on clinical tests compared to PsycINFO.