The Dark Factor of Personality (D-Factor) test is a psychological assessment tool designed to evaluate an individual's dark personality traits. The D-Factor concept revolves around a common core underlying various dark traits such as egoism, Machiavellianism, moral disengagement, narcissism, psychopathy, sadism, self-interest, spitefulness, and others. This test aims to identify the extent to which these traits are present in an individual and how they influence behavior and interpersonal interactions.