Enneagram of Personality
The test and all those of its kind, are generally considered to be one of many self-discovery "fads". That owes its sustained popularity and is categorized together as within the same class of suggestion of "which chakra or zodiac sign is dominant", with the "tests" use of binary questioning and the similar popularity of the MBPT, as akin to all others such as the related "9 Enneagram of Personality types" as each relying on the exploitation of the Barnum effect, a mix of flattery, followed by confirmation bias, with the participants thereby proceeding to searchingly attempt to "fit the prediction".