I view online psychological tests as entertainment because I place no value in them. Many of them lack specificity and crucial components of the disorders they attempt to screen. There may be the odd test here and there that is a bit more accurate but they don't replace a formal psychological test that has been empirically verified and clinically used. It's important to note that even these formal tests do not take the place of a diagnosis. An analogy would be a blood test; your chlosterol may be too high and potassium too low but that alone cannot determine the cause nor the diagnosis, however, they are evidence for supporting the diagnosis as well as the differential diagnoses.