Generally, sources provide descriptions but not the actual test instruments. Journal articles may include a portion or example of a test instrument. You might located the actual test instrument by:
Note: You need the copyright holder's permission to use the test if you plan to publish your research.
PsyArticles - In advance search, select TM Test & Measures as the search field. This field captures the tests and measures used in research study. It may be in the body or with an Appended label: Tests and Measures: Quest Atlantis Commitment Questionnaire (Appended)
CINAHL Plus - In advance search, select Instrumentation as the search field.
For other databases, search for your topic AND Test & Measures as the Subject search term. Look for alternate subjects such as inventory, questionnaire, assessments, or rating.