PsycINFO has a separate section on tests, 2200 Psychometrics & Statistics & Methodology.
To limit your search to this section:
"Every record in PsycINFO databases receives a classification code, which is used to categorize the document according to the primary subject matter. These classification codes can help you target your search by allowing you to restrict retrieval to a specific category." -- from APA Website
e.g. 2200 Psychometrics & Statistics & Methodology
2220 Tests & Testing
2221 Sensory & Motor Testing
2222 Developmental Scales & Schedules
2223 Personality Scales & Inventories
2224 Clinical Psychological Testing
2225 Neuropsychological Assessment
2226 Health Psychology Testing
2227 Educational Measurement
2228 Occupational & Employment Testing
2229 Consumer Opinion & Attitude Testing
2240 Statistics & Mathematics
2260 Research Methods & Experimental Design
Click on the "Additional Limits" button (located at the bottom of the PsycInfo Search panel) to select classification codes.
Click here to see an example of a Classificate Code search.