There are many online tests available to help you discover your personality type. The standard of the tests vary considerably.
The test I recommend was designed and researched by Professor David Daniels, emeritus Professor of Psychiatry and Behavioural studies at Stanford University, and who also trains people in the Enneagram. It is an online version of very popular little manual, “The Essential Enneagram”.
The test offers a practical way to discover, confirm and verify your Enneagram personality type with a high level of confidence.
However, ultimately you discover which type you are through introspection. You know yourself better than other people, it’s something you discover when you reflect on your own experience.