The ixperiencit test simple put is: If I experience it, it is conscious existence for me. If I do not experience the particular consciousness in question, it is not conscious existence or survival, for me. Or changing pronouns If you experience it, it is conscious existence for you. If you do not experience the particular consciousness in question, it is not conscious existence for you. You can test it on yourself right now. If you understand the terms experience, consciousness, and existence, you will very likely be conscious.
If you apply this test from a singular conscious perspective you will end up thinking that the non existent theory of conscious existence is true. This is because you are not experiencing now what you will or have experienced in your life. If you do not want to have to accept the nonexistent alternative, you then have to extend to the idea that you will and have experienced other things than you are now. There is more to you, than what your conscious existence is at this very instance. This also opens the door for multiplicity. Because you are more than what you are at this moment the question becomes how much more? Do you have conscious ownership of every identical consciousness to the ones you will expereince with this currrent body? And what about all this things that you could have experienced in this life but did not? They form different awarepaths produced by (relatively) slightly different physipaths. Do you have consciousness ownership or these also? Or do you have shared conscious ownership with many different potential people?