Being unconscious, these patterns are hard to recognize. Also, many of the Enneagram Types look alike when you are examining the ways they show up in the world. The key, then, is to become aware of one's own internal patterns and compare those patterns to the various type descriptions which you will find described in workshops, tapes and books. There are a number of written tests that have been published recently. Some of these tests appear in the various books which have been published on the Enneagram.
Tests also are available on the internet.
Unfortunately, few, if any, of these tests have been determined to be consistently reliable. Thus, the results from tests should be considered as no more than a possible indicator of your type. Some comparisons show that certain Enneagram types seem to match certain MBTI types with a higher degree of frequency than other MBTI types. But there is no reliable data to show that such matches are consistent on a large segment of the population. The Enneagram and the MBTI measure or evaluate different aspects of a person's personality.