If you’re interested in learning about your attachment style, there are many tests, scales, and questionnaires out available for you to take.
Feeny, Noller, and Hanrahan developed the Original Attachment Three-Category Measure in 1987 to test respondents’ adult attachment style. It contains only three items and is very simple, but it can still give you a good idea of which category you fall into: avoidant, anxious/ambivalent, or secure. You can complete the measure yourself or read more about it on page 3 of this PDF.
Bartholomew and Horowitz’s Relationships Questionnaire added to The Three-Category Measure by expanding it to include the dismissive-avoidant category. You can find it on the same PDF as the Three-Category Measure, starting on page 3.
Fraley, Waller, and Brennan’s Experiences in Close Relationships Questionnaire-Revised (ECR-R) is a 32-item questionnaire that gives results measured by two subscales related to attachment: avoidance and anxiety (Fraley, Waller, & Brennan, 2000). Items are rated on a scale from 1 (strongly disagree) to 7 (strongly agree). You can find this questionnaire on the final three pages of the PDF mentioned above.
In addition to these scales, there are several less rigorous attachment style tests that can help you learn about your own style of connecting with others. These aren’t instruments often used in empirical research, but they can be helpful tools for learning more about yourself and your attachment style.
Diane Poole Heller developed an Attachment Styles Test, which contains 45 items rated on a three-point scale from “Rarely/Never” to “Usually/Often.” You can find it here, although after completing it you must enter an email to receive your results.
The Relationship Attachment Style Test is a 50-item test hosted on Psychology Today’s website. It covers the four attachment types noted earlier (Secure, Anxious-Ambivalent, Dismissive-Avoidant, Fearful-Avoidant) as well as Dependent and Codependent attachment styles. If you are interested in taking this test, you can find it at this link. However, be aware that while you receive a free “snapshot report” at the end, you will need to pay $6.95 to see your full results.